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(factory) {\n typeof define === 'function' && define.amd ? define(factory) :\n factory();\n}((function () { 'use strict';\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n const days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];\n const months = ['Jan.', 'Feb.', 'March', 'April', 'May', 'June', 'July', 'Aug.', 'Sept.', 'Oct.', 'Nov.', 'Dec.'];\n const zeroPad = n => n < 10 ? '0' + n : n;\n\n const RFC = function(date) {\n const day = days[date.getDay()].substring(0, 3);\n const paddedDate = zeroPad(date.getDate());\n const month = months[date.getMonth()].substring(0,3);\n const year = date.getFullYear().toString();\n const hours = date.getUTCHours().toString();\n const minutes = date.getUTCMinutes().toString();\n const seconds = date.getUTCSeconds().toString();\n return `${day}, ${paddedDate} ${month} ${year} ${hours}:${minutes}:${seconds} Z`;\n };\n\n const objectFromMap = function(map) {\n const object = Array.from(map).reduce((object, [key, value]) => (\n Object.assign(object, { [key]: value }) // Be careful! Maps can have non-String keys; object literals can't.\n ), {});\n return object;\n };\n\n const mapFromObject = function(object) {\n const map = new Map();\n for (var property in object) {\n if (object.hasOwnProperty(property)) {\n map.set(property, object[property]);\n }\n }\n return map;\n };\n\n class Author {\n\n // constructor(name='', personalURL='', affiliation='', affiliationURL='') {\n // this.name = name; // 'Chris Olah'\n // this.personalURL = personalURL; // 'https://colah.github.io'\n // this.affiliation = affiliation; // 'Google Brain'\n // this.affiliationURL = affiliationURL; // 'https://g.co/brain'\n // }\n\n constructor(object) {\n this.name = object.author; // 'Chris Olah'\n this.personalURL = object.authorURL; // 'https://colah.github.io'\n this.affiliation = object.affiliation; // 'Google Brain'\n this.affiliationURL = object.affiliationURL; // 'https://g.co/brain'\n this.affiliations = object.affiliations || []; // new-style affiliations\n }\n\n // 'Chris'\n get firstName() {\n const names = this.name.split(' ');\n return names.slice(0, names.length - 1).join(' ');\n }\n\n // 'Olah'\n get lastName() {\n const names = this.name.split(' ');\n return names[names.length -1];\n }\n }\n\n function mergeFromYMLFrontmatter(target, source) {\n target.title = source.title;\n if (source.published) {\n if (source.published instanceof Date) {\n target.publishedDate = source.published;\n } else if (source.published.constructor === String) {\n target.publishedDate = new Date(source.published);\n }\n }\n if (source.publishedDate) {\n if (source.publishedDate instanceof Date) {\n target.publishedDate = source.publishedDate;\n } else if (source.publishedDate.constructor === String) {\n target.publishedDate = new Date(source.publishedDate);\n } else {\n console.error('Don\\'t know what to do with published date: ' + source.publishedDate);\n }\n }\n target.description = source.description;\n target.authors = source.authors.map( (authorObject) => new Author(authorObject));\n target.katex = source.katex;\n target.password = source.password;\n if (source.doi) {\n target.doi = source.doi;\n }\n }\n\n class FrontMatter {\n constructor() {\n this.title = 'unnamed article'; // 'Attention and Augmented Recurrent Neural Networks'\n this.description = ''; // 'A visual overview of neural attention...'\n this.authors = []; // Array of Author(s)\n\n this.bibliography = new Map();\n this.bibliographyParsed = false;\n // {\n // 'gregor2015draw': {\n // 'title': 'DRAW: A recurrent neural network for image generation',\n // 'author': 'Gregor, Karol and Danihelka, Ivo and Graves, Alex and Rezende, Danilo Jimenez and Wierstra, Daan',\n // 'journal': 'arXiv preprint arXiv:1502.04623',\n // 'year': '2015',\n // 'url': 'https://arxiv.org/pdf/1502.04623.pdf',\n // 'type': 'article'\n // },\n // }\n\n // Citation keys should be listed in the order that they are appear in the document.\n // Each key refers to a key in the bibliography dictionary.\n this.citations = []; // [ 'gregor2015draw', 'mercier2011humans' ]\n this.citationsCollected = false;\n\n //\n // Assigned from posts.csv\n //\n\n // publishedDate: 2016-09-08T07:00:00.000Z,\n // tags: [ 'rnn' ],\n // distillPath: '2016/augmented-rnns',\n // githubPath: 'distillpub/post--augmented-rnns',\n // doiSuffix: 1,\n\n //\n // Assigned from journal\n //\n this.journal = {};\n // journal: {\n // 'title': 'Distill',\n // 'full_title': 'Distill',\n // 'abbrev_title': 'Distill',\n // 'url': 'http://distill.pub',\n // 'doi': '10.23915/distill',\n // 'publisherName': 'Distill Working Group',\n // 'publisherEmail': 'admin@distill.pub',\n // 'issn': '2476-0757',\n // 'editors': [...],\n // 'committee': [...]\n // }\n // volume: 1,\n // issue: 9,\n\n this.katex = {};\n\n //\n // Assigned from publishing process\n //\n\n // githubCompareUpdatesUrl: 'https://github.com/distillpub/post--augmented-rnns/compare/1596e094d8943d2dc0ea445d92071129c6419c59...3bd9209e0c24d020f87cf6152dcecc6017cbc193',\n // updatedDate: 2017-03-21T07:13:16.000Z,\n // doi: '10.23915/distill.00001',\n this.doi = undefined;\n this.publishedDate = undefined;\n }\n\n // Example:\n // title: Demo Title Attention and Augmented Recurrent Neural Networks\n // published: Jan 10, 2017\n // authors:\n // - Chris Olah:\n // - Shan Carter: http://shancarter.com\n // affiliations:\n // - Google Brain:\n // - Google Brain: http://g.co/brain\n\n //\n // Computed Properties\n //\n\n // 'http://distill.pub/2016/augmented-rnns',\n set url(value) {\n this._url = value;\n }\n get url() {\n if (this._url) {\n return this._url;\n } else if (this.distillPath && this.journal.url) {\n return this.journal.url + '/' + this.distillPath;\n } else if (this.journal.url) {\n return this.journal.url;\n }\n }\n\n // 'https://github.com/distillpub/post--augmented-rnns',\n get githubUrl() {\n if (this.githubPath) {\n return 'https://github.com/' + this.githubPath;\n } else {\n return undefined;\n }\n }\n\n // TODO resolve differences in naming of URL/Url/url.\n // 'http://distill.pub/2016/augmented-rnns/thumbnail.jpg',\n set previewURL(value) {\n this._previewURL = value;\n }\n get previewURL() {\n return this._previewURL ? this._previewURL : this.url + '/thumbnail.jpg';\n }\n\n // 'Thu, 08 Sep 2016 00:00:00 -0700',\n get publishedDateRFC() {\n return RFC(this.publishedDate);\n }\n\n // 'Thu, 08 Sep 2016 00:00:00 -0700',\n get updatedDateRFC() {\n return RFC(this.updatedDate);\n }\n\n // 2016,\n get publishedYear() {\n return this.publishedDate.getFullYear();\n }\n\n // 'Sept',\n get publishedMonth() {\n return months[this.publishedDate.getMonth()];\n }\n\n // 8,\n get publishedDay() {\n return this.publishedDate.getDate();\n }\n\n // '09',\n get publishedMonthPadded() {\n return zeroPad(this.publishedDate.getMonth() + 1);\n }\n\n // '08',\n get publishedDayPadded() {\n return zeroPad(this.publishedDate.getDate());\n }\n\n get publishedISODateOnly() {\n return this.publishedDate.toISOString().split('T')[0];\n }\n\n get volume() {\n const volume = this.publishedYear - 2015;\n if (volume < 1) {\n throw new Error('Invalid publish date detected during computing volume');\n }\n return volume;\n }\n\n get issue() {\n return this.publishedDate.getMonth() + 1;\n }\n\n // 'Olah & Carter',\n get concatenatedAuthors() {\n if (this.authors.length > 2) {\n return this.authors[0].lastName + ', et al.';\n } else if (this.authors.length === 2) {\n return this.authors[0].lastName + ' & ' + this.authors[1].lastName;\n } else if (this.authors.length === 1) {\n return this.authors[0].lastName;\n }\n }\n\n // 'Olah, Chris and Carter, Shan',\n get bibtexAuthors() {\n return this.authors.map(author => {\n return author.lastName + ', ' + author.firstName;\n }).join(' and ');\n }\n\n // 'olah2016attention'\n get slug() {\n let slug = '';\n if (this.authors.length) {\n slug += this.authors[0].lastName.toLowerCase();\n slug += this.publishedYear;\n slug += this.title.split(' ')[0].toLowerCase();\n }\n return slug || 'Untitled';\n }\n\n get bibliographyEntries() {\n return new Map(this.citations.map( citationKey => {\n const entry = this.bibliography.get(citationKey);\n return [citationKey, entry];\n }));\n }\n\n set bibliography(bibliography) {\n if (bibliography instanceof Map) {\n this._bibliography = bibliography;\n } else if (typeof bibliography === 'object') {\n this._bibliography = mapFromObject(bibliography);\n }\n }\n\n get bibliography() {\n return this._bibliography;\n }\n\n static fromObject(source) {\n const frontMatter = new FrontMatter();\n Object.assign(frontMatter, source);\n return frontMatter;\n }\n\n assignToObject(target) {\n Object.assign(target, this);\n target.bibliography = objectFromMap(this.bibliographyEntries);\n target.url = this.url;\n target.doi = this.doi;\n target.githubUrl = this.githubUrl;\n target.previewURL = this.previewURL;\n if (this.publishedDate) {\n target.volume = this.volume;\n target.issue = this.issue;\n target.publishedDateRFC = this.publishedDateRFC;\n target.publishedYear = this.publishedYear;\n target.publishedMonth = this.publishedMonth;\n target.publishedDay = this.publishedDay;\n target.publishedMonthPadded = this.publishedMonthPadded;\n target.publishedDayPadded = this.publishedDayPadded;\n }\n if (this.updatedDate) {\n target.updatedDateRFC = this.updatedDateRFC;\n }\n target.concatenatedAuthors = this.concatenatedAuthors;\n target.bibtexAuthors = this.bibtexAuthors;\n target.slug = this.slug;\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n const Mutating = (superclass) => {\n return class extends superclass {\n\n constructor() {\n super();\n\n // set up mutation observer\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver( () => {\n observer.disconnect();\n this.renderIfPossible();\n observer.observe(this, options);\n });\n\n // ...and listen for changes\n observer.observe(this, options);\n }\n\n connectedCallback() {\n super.connectedCallback();\n\n this.renderIfPossible();\n }\n\n // potential TODO: check if this is enough for all our usecases\n // maybe provide a custom function to tell if we have enough information to render\n renderIfPossible() {\n if (this.textContent && this.root) {\n this.renderContent();\n }\n }\n\n renderContent() {\n console.error(`Your class ${this.constructor.name} must provide a custom renderContent() method!` );\n }\n\n }; // end class\n }; // end mixin function\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n /*global ShadyCSS*/\n\n const Template = (name, templateString, useShadow = true) => {\n\n return (superclass) => {\n\n const template = document.createElement('template');\n template.innerHTML = templateString;\n\n if (useShadow && 'ShadyCSS' in window) {\n ShadyCSS.prepareTemplate(template, name);\n }\n\n return class extends superclass {\n\n static get is() { return name; }\n\n constructor() {\n super();\n\n this.clone = document.importNode(template.content, true);\n if (useShadow) {\n this.attachShadow({mode: 'open'});\n this.shadowRoot.appendChild(this.clone);\n }\n }\n\n connectedCallback() {\n if (this.hasAttribute('distill-prerendered')) {\n return;\n }\n if (useShadow) {\n if ('ShadyCSS' in window) {\n ShadyCSS.styleElement(this);\n }\n } else {\n this.insertBefore(this.clone, this.firstChild);\n }\n }\n\n get root() {\n if (useShadow) {\n return this.shadowRoot;\n } else {\n return this;\n }\n }\n\n /* TODO: Are we using these? Should we even? */\n $(query) {\n return this.root.querySelector(query);\n }\n\n $$(query) {\n return this.root.querySelectorAll(query);\n }\n };\n };\n };\n\n var math = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nspan.katex-display {\\n text-align: left;\\n padding: 8px 0 8px 0;\\n margin: 0.5em 0 0.5em 1em;\\n}\\n\\nspan.katex {\\n -webkit-font-smoothing: antialiased;\\n color: rgba(0, 0, 0, 0.8);\\n font-size: 1.18em;\\n}\\n\";\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // This is a straight concatenation of code from KaTeX's contrib folder,\n // but we aren't using some of their helpers that don't work well outside a browser environment.\n\n /*global katex */\n\n const findEndOfMath = function(delimiter, text, startIndex) {\n // Adapted from\n // https://github.com/Khan/perseus/blob/master/src/perseus-markdown.jsx\n let index = startIndex;\n let braceLevel = 0;\n\n const delimLength = delimiter.length;\n\n while (index < text.length) {\n const character = text[index];\n\n if (\n braceLevel <= 0 &&\n text.slice(index, index + delimLength) === delimiter\n ) {\n return index;\n } else if (character === \"\\\\\") {\n index++;\n } else if (character === \"{\") {\n braceLevel++;\n } else if (character === \"}\") {\n braceLevel--;\n }\n\n index++;\n }\n\n return -1;\n };\n\n const splitAtDelimiters = function(startData, leftDelim, rightDelim, display) {\n const finalData = [];\n\n for (let i = 0; i < startData.length; i++) {\n if (startData[i].type === \"text\") {\n const text = startData[i].data;\n\n let lookingForLeft = true;\n let currIndex = 0;\n let nextIndex;\n\n nextIndex = text.indexOf(leftDelim);\n if (nextIndex !== -1) {\n currIndex = nextIndex;\n finalData.push({\n type: \"text\",\n data: text.slice(0, currIndex)\n });\n lookingForLeft = false;\n }\n\n while (true) {\n // eslint-disable-line no-constant-condition\n if (lookingForLeft) {\n nextIndex = text.indexOf(leftDelim, currIndex);\n if (nextIndex === -1) {\n break;\n }\n\n finalData.push({\n type: \"text\",\n data: text.slice(currIndex, nextIndex)\n });\n\n currIndex = nextIndex;\n } else {\n nextIndex = findEndOfMath(\n rightDelim,\n text,\n currIndex + leftDelim.length\n );\n if (nextIndex === -1) {\n break;\n }\n\n finalData.push({\n type: \"math\",\n data: text.slice(currIndex + leftDelim.length, nextIndex),\n rawData: text.slice(currIndex, nextIndex + rightDelim.length),\n display: display\n });\n\n currIndex = nextIndex + rightDelim.length;\n }\n\n lookingForLeft = !lookingForLeft;\n }\n\n finalData.push({\n type: \"text\",\n data: text.slice(currIndex)\n });\n } else {\n finalData.push(startData[i]);\n }\n }\n\n return finalData;\n };\n\n const splitWithDelimiters = function(text, delimiters) {\n let data = [{ type: \"text\", data: text }];\n for (let i = 0; i < delimiters.length; i++) {\n const delimiter = delimiters[i];\n data = splitAtDelimiters(\n data,\n delimiter.left,\n delimiter.right,\n delimiter.display || false\n );\n }\n return data;\n };\n\n /* Note: optionsCopy is mutated by this method. If it is ever exposed in the\n * API, we should copy it before mutating.\n */\n const renderMathInText = function(text, optionsCopy) {\n const data = splitWithDelimiters(text, optionsCopy.delimiters);\n const fragment = document.createDocumentFragment();\n\n for (let i = 0; i < data.length; i++) {\n if (data[i].type === \"text\") {\n fragment.appendChild(document.createTextNode(data[i].data));\n } else {\n const tag = document.createElement(\"d-math\");\n const math = data[i].data;\n // Override any display mode defined in the settings with that\n // defined by the text itself\n optionsCopy.displayMode = data[i].display;\n try {\n tag.textContent = math;\n if (optionsCopy.displayMode) {\n tag.setAttribute(\"block\", \"\");\n }\n } catch (e) {\n if (!(e instanceof katex.ParseError)) {\n throw e;\n }\n optionsCopy.errorCallback(\n \"KaTeX auto-render: Failed to parse `\" + data[i].data + \"` with \",\n e\n );\n fragment.appendChild(document.createTextNode(data[i].rawData));\n continue;\n }\n fragment.appendChild(tag);\n }\n }\n\n return fragment;\n };\n\n const renderElem = function(elem, optionsCopy) {\n for (let i = 0; i < elem.childNodes.length; i++) {\n const childNode = elem.childNodes[i];\n if (childNode.nodeType === 3) {\n // Text node\n const text = childNode.textContent;\n if (optionsCopy.mightHaveMath(text)) {\n const frag = renderMathInText(text, optionsCopy);\n i += frag.childNodes.length - 1;\n elem.replaceChild(frag, childNode);\n }\n } else if (childNode.nodeType === 1) {\n // Element node\n const shouldRender =\n optionsCopy.ignoredTags.indexOf(childNode.nodeName.toLowerCase()) ===\n -1;\n\n if (shouldRender) {\n renderElem(childNode, optionsCopy);\n }\n }\n // Otherwise, it's something else, and ignore it.\n }\n };\n\n const defaultAutoRenderOptions = {\n delimiters: [\n { left: \"$$\", right: \"$$\", display: true },\n { left: \"\\\\[\", right: \"\\\\]\", display: true },\n { left: \"\\\\(\", right: \"\\\\)\", display: false }\n // LaTeX uses this, but it ruins the display of normal `$` in text:\n // {left: '$', right: '$', display: false},\n ],\n\n ignoredTags: [\n \"script\",\n \"noscript\",\n \"style\",\n \"textarea\",\n \"pre\",\n \"code\",\n \"svg\"\n ],\n\n errorCallback: function(msg, err) {\n console.error(msg, err);\n }\n };\n\n const renderMathInElement = function(elem, options) {\n if (!elem) {\n throw new Error(\"No element provided to render\");\n }\n\n const optionsCopy = Object.assign({}, defaultAutoRenderOptions, options);\n const delimiterStrings = optionsCopy.delimiters.flatMap(d => [\n d.left,\n d.right\n ]);\n const mightHaveMath = text =>\n delimiterStrings.some(d => text.indexOf(d) !== -1);\n optionsCopy.mightHaveMath = mightHaveMath;\n renderElem(elem, optionsCopy);\n };\n\n // Copyright 2018 The Distill Template Authors\n\n const katexJSURL = 'https://distill.pub/third-party/katex/katex.min.js';\n const katexCSSTag = '';\n\n const T = Template('d-math', `\n${katexCSSTag}\n\n\n`);\n\n // DMath, not Math, because that would conflict with the JS built-in\n class DMath extends Mutating(T(HTMLElement)) {\n\n static set katexOptions(options) {\n DMath._katexOptions = options;\n if (DMath.katexOptions.delimiters) {\n if (!DMath.katexAdded) {\n DMath.addKatex();\n } else {\n DMath.katexLoadedCallback();\n }\n }\n }\n\n static get katexOptions() {\n if (!DMath._katexOptions) {\n DMath._katexOptions = {\n delimiters: [ { 'left':'$$', 'right':'$$', 'display': false } ]\n };\n }\n return DMath._katexOptions;\n }\n\n static katexLoadedCallback() {\n // render all d-math tags\n const mathTags = document.querySelectorAll('d-math');\n for (const mathTag of mathTags) {\n mathTag.renderContent();\n }\n // transform inline delimited math to d-math tags\n if (DMath.katexOptions.delimiters) {\n renderMathInElement(document.body, DMath.katexOptions);\n }\n }\n\n static addKatex() {\n // css tag can use this convenience function\n document.head.insertAdjacentHTML('beforeend', katexCSSTag);\n // script tag has to be created to work properly\n const scriptTag = document.createElement('script');\n scriptTag.src = katexJSURL;\n scriptTag.async = true;\n scriptTag.onload = DMath.katexLoadedCallback;\n scriptTag.crossorigin = 'anonymous';\n document.head.appendChild(scriptTag);\n\n DMath.katexAdded = true;\n }\n\n get options() {\n const localOptions = { displayMode: this.hasAttribute('block') };\n return Object.assign(localOptions, DMath.katexOptions);\n }\n\n connectedCallback() {\n super.connectedCallback();\n if (!DMath.katexAdded) {\n DMath.addKatex();\n }\n }\n\n renderContent() {\n if (typeof katex !== 'undefined') {\n const container = this.root.querySelector('#katex-container');\n katex.render(this.textContent, container, this.options);\n }\n }\n\n }\n\n DMath.katexAdded = false;\n DMath.inlineMathRendered = false;\n window.DMath = DMath; // TODO: check if this can be removed, or if we should expose a distill global\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n function collect_citations(dom = document) {\n const citations = new Set();\n const citeTags = dom.querySelectorAll(\"d-cite\");\n for (const tag of citeTags) {\n const keyString = tag.getAttribute(\"key\") || tag.getAttribute(\"bibtex-key\");\n const keys = keyString.split(\",\").map(k => k.trim());\n for (const key of keys) {\n citations.add(key);\n }\n }\n return [...citations];\n }\n\n function author_string(ent, template, sep, finalSep) {\n if (ent.author == null) {\n return \"\";\n }\n var names = ent.author.split(\" and \");\n let name_strings = names.map(name => {\n name = name.trim();\n if (name.indexOf(\",\") != -1) {\n var last = name.split(\",\")[0].trim();\n var firsts = name.split(\",\")[1];\n } else if (name.indexOf(\" \") != -1) {\n var last = name\n .split(\" \")\n .slice(-1)[0]\n .trim();\n var firsts = name\n .split(\" \")\n .slice(0, -1)\n .join(\" \");\n } else {\n var last = name.trim();\n }\n var initials = \"\";\n if (firsts != undefined) {\n initials = firsts\n .trim()\n .split(\" \")\n .map(s => s.trim()[0]);\n initials = initials.join(\".\") + \".\";\n }\n return template\n .replace(\"${F}\", firsts)\n .replace(\"${L}\", last)\n .replace(\"${I}\", initials)\n .trim(); // in case one of first or last was empty\n });\n if (names.length > 1) {\n var str = name_strings.slice(0, names.length - 1).join(sep);\n str += (finalSep || sep) + name_strings[names.length - 1];\n return str;\n } else {\n return name_strings[0];\n }\n }\n\n function venue_string(ent) {\n var cite = ent.journal || ent.booktitle || \"\";\n if (\"volume\" in ent) {\n var issue = ent.issue || ent.number;\n issue = issue != undefined ? \"(\" + issue + \")\" : \"\";\n cite += \", Vol \" + ent.volume + issue;\n }\n if (\"pages\" in ent) {\n cite += \", pp. \" + ent.pages;\n }\n if (cite != \"\") cite += \". \";\n if (\"publisher\" in ent) {\n cite += ent.publisher;\n if (cite[cite.length - 1] != \".\") cite += \".\";\n }\n return cite;\n }\n\n function link_string(ent) {\n if (\"url\" in ent) {\n var url = ent.url;\n var arxiv_match = /arxiv\\.org\\/abs\\/([0-9\\.]*)/.exec(url);\n if (arxiv_match != null) {\n url = `http://arxiv.org/pdf/${arxiv_match[1]}.pdf`;\n }\n\n if (url.slice(-4) == \".pdf\") {\n var label = \"PDF\";\n } else if (url.slice(-5) == \".html\") {\n var label = \"HTML\";\n }\n return `  [${label || \"link\"}]`;\n } /* else if (\"doi\" in ent){\n return `  [DOI]`;\n }*/ else {\n return \"\";\n }\n }\n function doi_string(ent, new_line) {\n if (\"doi\" in ent) {\n return `${new_line ? \"
      \" : \"\"} DOI: ${ent.doi}`;\n } else {\n return \"\";\n }\n }\n\n function title_string(ent) {\n return '' + ent.title + \" \";\n }\n\n function bibliography_cite(ent, fancy) {\n if (ent) {\n var cite = title_string(ent);\n cite += link_string(ent) + \"
      \";\n if (ent.author) {\n cite += author_string(ent, \"${L}, ${I}\", \", \", \" and \");\n if (ent.year || ent.date) {\n cite += \", \";\n }\n }\n if (ent.year || ent.date) {\n cite += (ent.year || ent.date) + \". \";\n } else {\n cite += \". \";\n }\n cite += venue_string(ent);\n cite += doi_string(ent);\n return cite;\n /*var cite = author_string(ent, \"${L}, ${I}\", \", \", \" and \");\n if (ent.year || ent.date){\n cite += \", \" + (ent.year || ent.date) + \". \"\n } else {\n cite += \". \"\n }\n cite += \"\" + ent.title + \". \";\n cite += venue_string(ent);\n cite += doi_string(ent);\n cite += link_string(ent);\n return cite*/\n } else {\n return \"?\";\n }\n }\n\n function hover_cite(ent) {\n if (ent) {\n var cite = \"\";\n cite += \"\" + ent.title + \"\";\n cite += link_string(ent);\n cite += \"
      \";\n\n var a_str = author_string(ent, \"${I} ${L}\", \", \") + \".\";\n var v_str =\n venue_string(ent).trim() + \" \" + ent.year + \". \" + doi_string(ent, true);\n\n if ((a_str + v_str).length < Math.min(40, ent.title.length)) {\n cite += a_str + \" \" + v_str;\n } else {\n cite += a_str + \"
      \" + v_str;\n }\n return cite;\n } else {\n return \"?\";\n }\n }\n\n function domContentLoaded() {\n return ['interactive', 'complete'].indexOf(document.readyState) !== -1;\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n function _moveLegacyAffiliationFormatIntoArray(frontMatter) {\n // authors used to have propoerties \"affiliation\" and \"affiliationURL\".\n // We now encourage using an array for affiliations containing objects with\n // properties \"name\" and \"url\".\n for (let author of frontMatter.authors) {\n const hasOldStyle = Boolean(author.affiliation);\n const hasNewStyle = Boolean(author.affiliations);\n if (!hasOldStyle) continue;\n if (hasNewStyle) {\n console.warn(`Author ${author.author} has both old-style (\"affiliation\" & \"affiliationURL\") and new style (\"affiliations\") affiliation information!`);\n } else {\n let newAffiliation = {\n \"name\": author.affiliation\n };\n if (author.affiliationURL) newAffiliation.url = author.affiliationURL;\n author.affiliations = [newAffiliation];\n }\n }\n return frontMatter\n }\n\n function parseFrontmatter(element) {\n const scriptTag = element.firstElementChild;\n if (scriptTag) {\n const type = scriptTag.getAttribute('type');\n if (type.split('/')[1] == 'json') {\n const content = scriptTag.textContent;\n const parsed = JSON.parse(content);\n return _moveLegacyAffiliationFormatIntoArray(parsed);\n } else {\n console.error('Distill only supports JSON frontmatter tags anymore; no more YAML.');\n }\n } else {\n console.error('You added a frontmatter tag but did not provide a script tag with front matter data in it. Please take a look at our templates.');\n }\n return {};\n }\n\n class FrontMatter$1 extends HTMLElement {\n\n static get is() { return 'd-front-matter'; }\n\n constructor() {\n super();\n\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver( (entries) => {\n for (const entry of entries) {\n if (entry.target.nodeName === 'SCRIPT' || entry.type === 'characterData') {\n const data = parseFrontmatter(this);\n this.notify(data);\n }\n }\n });\n observer.observe(this, options);\n }\n\n notify(data) {\n const options = { detail: data, bubbles: true };\n const event = new CustomEvent('onFrontMatterChanged', options);\n document.dispatchEvent(event);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // no appendix -> add appendix\n // title in front, no h1 -> add it\n // no title in front, h1 -> read and put into frontMatter\n // footnote -> footnote list\n // break up bib\n // if citation, no bib-list -> add citation-list\n\n // if authors, no byline -> add byline\n\n function optionalComponents(dom, data) {\n const body = dom.body;\n const article = body.querySelector('d-article');\n\n // If we don't have an article tag, something weird is going on—giving up.\n if (!article) {\n console.warn('No d-article tag found; skipping adding optional components!');\n return;\n }\n\n let byline = dom.querySelector('d-byline');\n if (!byline) {\n if (data.authors) {\n byline = dom.createElement('d-byline');\n body.insertBefore(byline, article);\n } else {\n console.warn('No authors found in front matter; please add them before submission!');\n }\n }\n\n let title = dom.querySelector('d-title');\n if (!title) {\n title = dom.createElement('d-title');\n body.insertBefore(title, byline);\n }\n\n let h1 = title.querySelector('h1');\n if (!h1) {\n h1 = dom.createElement('h1');\n h1.textContent = data.title;\n title.insertBefore(h1, title.firstChild);\n }\n\n const hasPassword = typeof data.password !== 'undefined';\n let interstitial = body.querySelector('d-interstitial');\n if (hasPassword && !interstitial) {\n const inBrowser = typeof window !== 'undefined';\n const onLocalhost = inBrowser && window.location.hostname.includes('localhost');\n if (!inBrowser || !onLocalhost) {\n interstitial = dom.createElement('d-interstitial');\n interstitial.password = data.password;\n body.insertBefore(interstitial, body.firstChild);\n }\n } else if (!hasPassword && interstitial) {\n interstitial.parentElement.removeChild(this);\n }\n\n let appendix = dom.querySelector('d-appendix');\n if (!appendix) {\n appendix = dom.createElement('d-appendix');\n dom.body.appendChild(appendix);\n }\n\n let footnoteList = dom.querySelector('d-footnote-list');\n if (!footnoteList) {\n footnoteList = dom.createElement('d-footnote-list');\n appendix.appendChild(footnoteList);\n }\n\n let citationList = dom.querySelector('d-citation-list');\n if (!citationList) {\n citationList = dom.createElement('d-citation-list');\n appendix.appendChild(citationList);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const frontMatter = new FrontMatter();\n\n const Controller = {\n frontMatter: frontMatter,\n waitingOn: {\n bibliography: [],\n citations: []\n },\n listeners: {\n onCiteKeyCreated(event) {\n const [citeTag, keys] = event.detail;\n\n // ensure we have citations\n if (!frontMatter.citationsCollected) {\n // console.debug('onCiteKeyCreated, but unresolved dependency (\"citations\"). Enqueing.');\n Controller.waitingOn.citations.push(() =>\n Controller.listeners.onCiteKeyCreated(event)\n );\n return;\n }\n\n // ensure we have a loaded bibliography\n if (!frontMatter.bibliographyParsed) {\n // console.debug('onCiteKeyCreated, but unresolved dependency (\"bibliography\"). Enqueing.');\n Controller.waitingOn.bibliography.push(() =>\n Controller.listeners.onCiteKeyCreated(event)\n );\n return;\n }\n\n const numbers = keys.map(key => frontMatter.citations.indexOf(key));\n citeTag.numbers = numbers;\n const entries = keys.map(key => frontMatter.bibliography.get(key));\n citeTag.entries = entries;\n },\n\n onCiteKeyChanged() {\n // const [citeTag, keys] = event.detail;\n\n // update citations\n frontMatter.citations = collect_citations();\n frontMatter.citationsCollected = true;\n for (const waitingCallback of Controller.waitingOn.citations.slice()) {\n waitingCallback();\n }\n\n // update bibliography\n const citationListTag = document.querySelector(\"d-citation-list\");\n const bibliographyEntries = new Map(\n frontMatter.citations.map(citationKey => {\n return [citationKey, frontMatter.bibliography.get(citationKey)];\n })\n );\n citationListTag.citations = bibliographyEntries;\n\n const citeTags = document.querySelectorAll(\"d-cite\");\n for (const citeTag of citeTags) {\n console.log(citeTag);\n const keys = citeTag.keys;\n const numbers = keys.map(key => frontMatter.citations.indexOf(key));\n citeTag.numbers = numbers;\n const entries = keys.map(key => frontMatter.bibliography.get(key));\n citeTag.entries = entries;\n }\n },\n\n onCiteKeyRemoved(event) {\n Controller.listeners.onCiteKeyChanged(event);\n },\n\n onBibliographyChanged(event) {\n const citationListTag = document.querySelector(\"d-citation-list\");\n\n const bibliography = event.detail;\n\n frontMatter.bibliography = bibliography;\n frontMatter.bibliographyParsed = true;\n for (const waitingCallback of Controller.waitingOn.bibliography.slice()) {\n waitingCallback();\n }\n\n // ensure we have citations\n if (!frontMatter.citationsCollected) {\n Controller.waitingOn.citations.push(function() {\n Controller.listeners.onBibliographyChanged({\n target: event.target,\n detail: event.detail\n });\n });\n return;\n }\n\n if (citationListTag.hasAttribute(\"distill-prerendered\")) {\n console.debug(\"Citation list was prerendered; not updating it.\");\n } else {\n const entries = new Map(\n frontMatter.citations.map(citationKey => {\n return [citationKey, frontMatter.bibliography.get(citationKey)];\n })\n );\n citationListTag.citations = entries;\n }\n },\n\n onFootnoteChanged() {\n // const footnote = event.detail;\n //TODO: optimize to only update current footnote\n const footnotesList = document.querySelector(\"d-footnote-list\");\n if (footnotesList) {\n const footnotes = document.querySelectorAll(\"d-footnote\");\n footnotesList.footnotes = footnotes;\n }\n },\n\n onFrontMatterChanged(event) {\n const data = event.detail;\n mergeFromYMLFrontmatter(frontMatter, data);\n\n const interstitial = document.querySelector(\"d-interstitial\");\n if (interstitial) {\n if (typeof frontMatter.password !== \"undefined\") {\n interstitial.password = frontMatter.password;\n } else {\n interstitial.parentElement.removeChild(interstitial);\n }\n }\n\n const prerendered = document.body.hasAttribute(\"distill-prerendered\");\n if (!prerendered && domContentLoaded()) {\n optionalComponents(document, frontMatter);\n\n const appendix = document.querySelector(\"distill-appendix\");\n if (appendix) {\n appendix.frontMatter = frontMatter;\n }\n\n const byline = document.querySelector(\"d-byline\");\n if (byline) {\n byline.frontMatter = frontMatter;\n }\n\n if (data.katex) {\n DMath.katexOptions = data.katex;\n }\n }\n },\n\n DOMContentLoaded() {\n if (Controller.loaded) {\n console.warn(\n \"Controller received DOMContentLoaded but was already loaded!\"\n );\n return;\n } else if (!domContentLoaded()) {\n console.warn(\n \"Controller received DOMContentLoaded at document.readyState: \" +\n document.readyState +\n \"!\"\n );\n return;\n } else {\n Controller.loaded = true;\n console.debug(\"Runlevel 4: Controller running DOMContentLoaded\");\n }\n\n const frontMatterTag = document.querySelector(\"d-front-matter\");\n if (frontMatterTag) {\n const data = parseFrontmatter(frontMatterTag);\n Controller.listeners.onFrontMatterChanged({ detail: data });\n }\n\n // Resolving \"citations\" dependency due to initial DOM load\n frontMatter.citations = collect_citations();\n frontMatter.citationsCollected = true;\n for (const waitingCallback of Controller.waitingOn.citations.slice()) {\n waitingCallback();\n }\n\n if (frontMatter.bibliographyParsed) {\n for (const waitingCallback of Controller.waitingOn.bibliography.slice()) {\n waitingCallback();\n }\n }\n\n const footnotesList = document.querySelector(\"d-footnote-list\");\n if (footnotesList) {\n const footnotes = document.querySelectorAll(\"d-footnote\");\n footnotesList.footnotes = footnotes;\n }\n }\n } // listeners\n }; // Controller\n\n var base = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nhtml {\\n font-size: 14px;\\n\\tline-height: 1.6em;\\n /* font-family: \\\"Libre Franklin\\\", \\\"Helvetica Neue\\\", sans-serif; */\\n font-family: -apple-system, BlinkMacSystemFont, \\\"Segoe UI\\\", Roboto, Oxygen, Ubuntu, Cantarell, \\\"Fira Sans\\\", \\\"Droid Sans\\\", \\\"Helvetica Neue\\\", Arial, sans-serif;\\n /*, \\\"Apple Color Emoji\\\", \\\"Segoe UI Emoji\\\", \\\"Segoe UI Symbol\\\";*/\\n text-size-adjust: 100%;\\n -ms-text-size-adjust: 100%;\\n -webkit-text-size-adjust: 100%;\\n}\\n\\n@media(min-width: 768px) {\\n html {\\n font-size: 16px;\\n }\\n}\\n\\nbody {\\n margin: 0;\\n}\\n\\na {\\n color: #004276;\\n}\\n\\nfigure {\\n margin: 0;\\n}\\n\\ntable {\\n\\tborder-collapse: collapse;\\n\\tborder-spacing: 0;\\n}\\n\\ntable th {\\n\\ttext-align: left;\\n}\\n\\ntable thead {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.05);\\n}\\n\\ntable thead th {\\n padding-bottom: 0.5em;\\n}\\n\\ntable tbody :first-child td {\\n padding-top: 0.5em;\\n}\\n\\npre {\\n overflow: auto;\\n max-width: 100%;\\n}\\n\\np {\\n margin-top: 0;\\n margin-bottom: 1em;\\n}\\n\\nsup, sub {\\n vertical-align: baseline;\\n position: relative;\\n top: -0.4em;\\n line-height: 1em;\\n}\\n\\nsub {\\n top: 0.4em;\\n}\\n\\n.kicker,\\n.marker {\\n font-size: 15px;\\n font-weight: 600;\\n color: rgba(0, 0, 0, 0.5);\\n}\\n\\n\\n/* Headline */\\n\\n@media(min-width: 1024px) {\\n d-title h1 span {\\n display: block;\\n }\\n}\\n\\n/* Figure */\\n\\nfigure {\\n position: relative;\\n margin-bottom: 2.5em;\\n margin-top: 1.5em;\\n}\\n\\nfigcaption+figure {\\n\\n}\\n\\nfigure img {\\n width: 100%;\\n}\\n\\nfigure svg text,\\nfigure svg tspan {\\n}\\n\\nfigcaption,\\n.figcaption {\\n color: rgba(0, 0, 0, 0.6);\\n font-size: 12px;\\n line-height: 1.5em;\\n}\\n\\n@media(min-width: 1024px) {\\nfigcaption,\\n.figcaption {\\n font-size: 13px;\\n }\\n}\\n\\nfigure.external img {\\n background: white;\\n border: 1px solid rgba(0, 0, 0, 0.1);\\n box-shadow: 0 1px 8px rgba(0, 0, 0, 0.1);\\n padding: 18px;\\n box-sizing: border-box;\\n}\\n\\nfigcaption a {\\n color: rgba(0, 0, 0, 0.6);\\n}\\n\\nfigcaption b,\\nfigcaption strong, {\\n font-weight: 600;\\n color: rgba(0, 0, 0, 1.0);\\n}\\n\";\n\n var layout = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\n@supports not (display: grid) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n display: block;\\n padding: 8px;\\n }\\n}\\n\\n.base-grid,\\ndistill-header,\\nd-title,\\nd-abstract,\\nd-article,\\nd-appendix,\\ndistill-appendix,\\nd-byline,\\nd-footnote-list,\\nd-citation-list,\\ndistill-footer {\\n display: grid;\\n justify-items: stretch;\\n grid-template-columns: [screen-start] 8px [page-start kicker-start text-start gutter-start middle-start] 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr [text-end page-end gutter-end kicker-end middle-end] 8px [screen-end];\\n grid-column-gap: 8px;\\n}\\n\\n.grid {\\n display: grid;\\n grid-column-gap: 8px;\\n}\\n\\n@media(min-width: 768px) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n grid-template-columns: [screen-start] 1fr [page-start kicker-start middle-start text-start] 45px 45px 45px 45px 45px 45px 45px 45px [ kicker-end text-end gutter-start] 45px [middle-end] 45px [page-end gutter-end] 1fr [screen-end];\\n grid-column-gap: 16px;\\n }\\n\\n .grid {\\n grid-column-gap: 16px;\\n }\\n}\\n\\n@media(min-width: 1000px) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n grid-template-columns: [screen-start] 1fr [page-start kicker-start] 50px [middle-start] 50px [text-start kicker-end] 50px 50px 50px 50px 50px 50px 50px 50px [text-end gutter-start] 50px [middle-end] 50px [page-end gutter-end] 1fr [screen-end];\\n grid-column-gap: 16px;\\n }\\n\\n .grid {\\n grid-column-gap: 16px;\\n }\\n}\\n\\n@media(min-width: 1180px) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n grid-template-columns: [screen-start] 1fr [page-start kicker-start] 60px [middle-start] 60px [text-start kicker-end] 60px 60px 60px 60px 60px 60px 60px 60px [text-end gutter-start] 60px [middle-end] 60px [page-end gutter-end] 1fr [screen-end];\\n grid-column-gap: 32px;\\n }\\n\\n .grid {\\n grid-column-gap: 32px;\\n }\\n}\\n\\n\\n\\n\\n.base-grid {\\n grid-column: screen;\\n}\\n\\n/* .l-body,\\nd-article > * {\\n grid-column: text;\\n}\\n\\n.l-page,\\nd-title > *,\\nd-figure {\\n grid-column: page;\\n} */\\n\\n.l-gutter {\\n grid-column: gutter;\\n}\\n\\n.l-text,\\n.l-body {\\n grid-column: text;\\n}\\n\\n.l-page {\\n grid-column: page;\\n}\\n\\n.l-body-outset {\\n grid-column: middle;\\n}\\n\\n.l-page-outset {\\n grid-column: page;\\n}\\n\\n.l-screen {\\n grid-column: screen;\\n}\\n\\n.l-screen-inset {\\n grid-column: screen;\\n padding-left: 16px;\\n padding-left: 16px;\\n}\\n\\n\\n/* Aside */\\n\\nd-article aside {\\n grid-column: gutter;\\n font-size: 12px;\\n line-height: 1.6em;\\n color: rgba(0, 0, 0, 0.6)\\n}\\n\\n@media(min-width: 768px) {\\n aside {\\n grid-column: gutter;\\n }\\n\\n .side {\\n grid-column: gutter;\\n }\\n}\\n\";\n\n var print = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\n@media print {\\n\\n @page {\\n size: 8in 11in;\\n @bottom-right {\\n content: counter(page) \\\" of \\\" counter(pages);\\n }\\n }\\n\\n html {\\n /* no general margins -- CSS Grid takes care of those */\\n }\\n\\n p, code {\\n page-break-inside: avoid;\\n }\\n\\n h2, h3 {\\n page-break-after: avoid;\\n }\\n\\n d-header {\\n visibility: hidden;\\n }\\n\\n d-footer {\\n display: none!important;\\n }\\n\\n}\\n\";\n\n var byline = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nd-byline {\\n contain: style;\\n overflow: hidden;\\n border-top: 1px solid rgba(0, 0, 0, 0.1);\\n font-size: 0.8rem;\\n line-height: 1.8em;\\n padding: 1.5rem 0;\\n min-height: 1.8em;\\n}\\n\\n\\nd-byline .byline {\\n grid-template-columns: 1fr 1fr;\\n grid-column: text;\\n}\\n\\n@media(min-width: 768px) {\\n d-byline .byline {\\n grid-template-columns: 1fr 1fr 1fr 1fr;\\n }\\n}\\n\\nd-byline .authors-affiliations {\\n grid-column-end: span 2;\\n grid-template-columns: 1fr 1fr;\\n margin-bottom: 1em;\\n}\\n\\n@media(min-width: 768px) {\\n d-byline .authors-affiliations {\\n margin-bottom: 0;\\n }\\n}\\n\\nd-byline h3 {\\n font-size: 0.6rem;\\n font-weight: 400;\\n color: rgba(0, 0, 0, 0.5);\\n margin: 0;\\n text-transform: uppercase;\\n}\\n\\nd-byline p {\\n margin: 0;\\n}\\n\\nd-byline a,\\nd-article d-byline a {\\n color: rgba(0, 0, 0, 0.8);\\n text-decoration: none;\\n border-bottom: none;\\n}\\n\\nd-article d-byline a:hover {\\n text-decoration: underline;\\n border-bottom: none;\\n}\\n\\nd-byline p.author {\\n font-weight: 500;\\n}\\n\\nd-byline .affiliations {\\n\\n}\\n\";\n\n var article = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nd-article {\\n contain: layout style;\\n overflow-x: hidden;\\n border-top: 1px solid rgba(0, 0, 0, 0.1);\\n padding-top: 2rem;\\n color: rgba(0, 0, 0, 0.8);\\n}\\n\\nd-article > * {\\n grid-column: text;\\n}\\n\\n@media(min-width: 768px) {\\n d-article {\\n font-size: 16px;\\n }\\n}\\n\\n@media(min-width: 1024px) {\\n d-article {\\n font-size: 1.06rem;\\n line-height: 1.7em;\\n }\\n}\\n\\n\\n/* H2 */\\n\\n\\nd-article .marker {\\n text-decoration: none;\\n border: none;\\n counter-reset: section;\\n grid-column: kicker;\\n line-height: 1.7em;\\n}\\n\\nd-article .marker:hover {\\n border: none;\\n}\\n\\nd-article .marker span {\\n padding: 0 3px 4px;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.2);\\n position: relative;\\n top: 4px;\\n}\\n\\nd-article .marker:hover span {\\n color: rgba(0, 0, 0, 0.7);\\n border-bottom: 1px solid rgba(0, 0, 0, 0.7);\\n}\\n\\nd-article h2 {\\n font-weight: 600;\\n font-size: 24px;\\n line-height: 1.25em;\\n margin: 2rem 0 1.5rem 0;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.1);\\n padding-bottom: 1rem;\\n}\\n\\n@media(min-width: 1024px) {\\n d-article h2 {\\n font-size: 36px;\\n }\\n}\\n\\n/* H3 */\\n\\nd-article h3 {\\n font-weight: 700;\\n font-size: 18px;\\n line-height: 1.4em;\\n margin-bottom: 1em;\\n margin-top: 2em;\\n}\\n\\n@media(min-width: 1024px) {\\n d-article h3 {\\n font-size: 20px;\\n }\\n}\\n\\n/* H4 */\\n\\nd-article h4 {\\n font-weight: 600;\\n text-transform: uppercase;\\n font-size: 14px;\\n line-height: 1.4em;\\n}\\n\\nd-article a {\\n color: inherit;\\n}\\n\\nd-article p,\\nd-article ul,\\nd-article ol,\\nd-article blockquote {\\n margin-top: 0;\\n margin-bottom: 1em;\\n margin-left: 0;\\n margin-right: 0;\\n}\\n\\nd-article blockquote {\\n border-left: 2px solid rgba(0, 0, 0, 0.2);\\n padding-left: 2em;\\n font-style: italic;\\n color: rgba(0, 0, 0, 0.6);\\n}\\n\\nd-article a {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.4);\\n text-decoration: none;\\n}\\n\\nd-article a:hover {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.8);\\n}\\n\\nd-article .link {\\n text-decoration: underline;\\n cursor: pointer;\\n}\\n\\nd-article ul,\\nd-article ol {\\n padding-left: 24px;\\n}\\n\\nd-article li {\\n margin-bottom: 1em;\\n margin-left: 0;\\n padding-left: 0;\\n}\\n\\nd-article li:last-child {\\n margin-bottom: 0;\\n}\\n\\nd-article pre {\\n font-size: 14px;\\n margin-bottom: 20px;\\n}\\n\\nd-article hr {\\n grid-column: screen;\\n width: 100%;\\n border: none;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.1);\\n margin-top: 60px;\\n margin-bottom: 60px;\\n}\\n\\nd-article section {\\n margin-top: 60px;\\n margin-bottom: 60px;\\n}\\n\\nd-article span.equation-mimic {\\n font-family: georgia;\\n font-size: 115%;\\n font-style: italic;\\n}\\n\\nd-article > d-code,\\nd-article section > d-code {\\n display: block;\\n}\\n\\nd-article > d-math[block],\\nd-article section > d-math[block] {\\n display: block;\\n}\\n\\n@media (max-width: 768px) {\\n d-article > d-code,\\n d-article section > d-code,\\n d-article > d-math[block],\\n d-article section > d-math[block] {\\n overflow-x: scroll;\\n -ms-overflow-style: none; // IE 10+\\n overflow: -moz-scrollbars-none; // Firefox\\n }\\n\\n d-article > d-code::-webkit-scrollbar,\\n d-article section > d-code::-webkit-scrollbar,\\n d-article > d-math[block]::-webkit-scrollbar,\\n d-article section > d-math[block]::-webkit-scrollbar {\\n display: none; // Safari and Chrome\\n }\\n}\\n\\nd-article .citation {\\n color: #668;\\n cursor: pointer;\\n}\\n\\nd-include {\\n width: auto;\\n display: block;\\n}\\n\\nd-figure {\\n contain: layout style;\\n}\\n\\n/* KaTeX */\\n\\n.katex, .katex-prerendered {\\n contain: style;\\n display: inline-block;\\n}\\n\\n/* Tables */\\n\\nd-article table {\\n border-collapse: collapse;\\n margin-bottom: 1.5rem;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.2);\\n}\\n\\nd-article table th {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.2);\\n}\\n\\nd-article table td {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.05);\\n}\\n\\nd-article table tr:last-of-type td {\\n border-bottom: none;\\n}\\n\\nd-article table th,\\nd-article table td {\\n font-size: 15px;\\n padding: 2px 8px;\\n}\\n\\nd-article table tbody :first-child td {\\n padding-top: 2px;\\n}\\n\";\n\n var title = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nd-title {\\n padding: 2rem 0 1.5rem;\\n contain: layout style;\\n overflow-x: hidden;\\n}\\n\\n@media(min-width: 768px) {\\n d-title {\\n padding: 4rem 0 1.5rem;\\n }\\n}\\n\\nd-title h1 {\\n grid-column: text;\\n font-size: 40px;\\n font-weight: 700;\\n line-height: 1.1em;\\n margin: 0 0 0.5rem;\\n}\\n\\n@media(min-width: 768px) {\\n d-title h1 {\\n font-size: 50px;\\n }\\n}\\n\\nd-title p {\\n font-weight: 300;\\n font-size: 1.2rem;\\n line-height: 1.55em;\\n grid-column: text;\\n}\\n\\nd-title .status {\\n margin-top: 0px;\\n font-size: 12px;\\n color: #009688;\\n opacity: 0.8;\\n grid-column: kicker;\\n}\\n\\nd-title .status span {\\n line-height: 1;\\n display: inline-block;\\n padding: 6px 0;\\n border-bottom: 1px solid #80cbc4;\\n font-size: 11px;\\n text-transform: uppercase;\\n}\\n\";\n\n // Copyright 2018 The Distill Template Authors\n\n const styles = base + layout + title + byline + article + math + print;\n\n function makeStyleTag(dom) {\n\n const styleTagId = 'distill-prerendered-styles';\n const prerenderedTag = dom.getElementById(styleTagId);\n if (!prerenderedTag) {\n const styleTag = dom.createElement('style');\n styleTag.id = styleTagId;\n styleTag.type = 'text/css';\n const cssTextTag = dom.createTextNode(styles);\n styleTag.appendChild(cssTextTag);\n const firstScriptTag = dom.head.querySelector('script');\n dom.head.insertBefore(styleTag, firstScriptTag);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n function addPolyfill(polyfill, polyfillLoadedCallback) {\n console.debug('Runlevel 0: Polyfill required: ' + polyfill.name);\n const script = document.createElement('script');\n script.src = polyfill.url;\n script.async = false;\n if (polyfillLoadedCallback) {\n script.onload = function() { polyfillLoadedCallback(polyfill); };\n }\n script.onerror = function() {\n new Error('Runlevel 0: Polyfills failed to load script ' + polyfill.name);\n };\n document.head.appendChild(script);\n }\n\n const polyfills = [\n {\n name: 'WebComponents',\n support: function() {\n return 'customElements' in window &&\n 'attachShadow' in Element.prototype &&\n 'getRootNode' in Element.prototype &&\n 'content' in document.createElement('template') &&\n 'Promise' in window &&\n 'from' in Array;\n },\n url: 'https://distill.pub/third-party/polyfills/webcomponents-lite.js'\n }, {\n name: 'IntersectionObserver',\n support: function() {\n return 'IntersectionObserver' in window &&\n 'IntersectionObserverEntry' in window;\n },\n url: 'https://distill.pub/third-party/polyfills/intersection-observer.js'\n },\n ];\n\n class Polyfills {\n\n static browserSupportsAllFeatures() {\n return polyfills.every((poly) => poly.support());\n }\n\n static load(callback) {\n // Define an intermediate callback that checks if all is loaded.\n const polyfillLoaded = function(polyfill) {\n polyfill.loaded = true;\n console.debug('Runlevel 0: Polyfill has finished loading: ' + polyfill.name);\n // console.debug(window[polyfill.name]);\n if (Polyfills.neededPolyfills.every((poly) => poly.loaded)) {\n console.debug('Runlevel 0: All required polyfills have finished loading.');\n console.debug('Runlevel 0->1.');\n window.distillRunlevel = 1;\n callback();\n }\n };\n // Add polyfill script tags\n for (const polyfill of Polyfills.neededPolyfills) {\n addPolyfill(polyfill, polyfillLoaded);\n }\n }\n\n static get neededPolyfills() {\n if (!Polyfills._neededPolyfills) {\n Polyfills._neededPolyfills = polyfills.filter((poly) => !poly.support());\n }\n return Polyfills._neededPolyfills;\n }\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // const marginSmall = 16;\n // const marginLarge = 3 * marginSmall;\n // const margin = marginSmall + marginLarge;\n // const gutter = marginSmall;\n // const outsetAmount = margin / 2;\n // const numCols = 4;\n // const numGutters = numCols - 1;\n // const columnWidth = (768 - 2 * marginLarge - numGutters * gutter) / numCols;\n //\n // const screenwidth = 768;\n // const pageWidth = screenwidth - 2 * marginLarge;\n // const bodyWidth = pageWidth - columnWidth - gutter;\n\n function body(selector) {\n return `${selector} {\n grid-column: left / text;\n }\n `;\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$1 = Template('d-abstract', `\n\n\n\n`);\n\n class Abstract extends T$1(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$2 = Template('d-appendix', `\n\n\n`, false);\n\n class Appendix extends T$2(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // import { Template } from '../mixins/template';\n // import { Controller } from '../controller';\n\n const isOnlyWhitespace = /^\\s*$/;\n\n class Article extends HTMLElement {\n static get is() { return 'd-article'; }\n\n constructor() {\n super();\n\n new MutationObserver( (mutations) => {\n for (const mutation of mutations) {\n for (const addedNode of mutation.addedNodes) {\n switch (addedNode.nodeName) {\n case '#text': { // usually text nodes are only linebreaks.\n const text = addedNode.nodeValue;\n if (!isOnlyWhitespace.test(text)) {\n console.warn('Use of unwrapped text in distill articles is discouraged as it breaks layout! Please wrap any text in a or

      tag. We found the following text: ' + text);\n const wrapper = document.createElement('span');\n wrapper.innerHTML = addedNode.nodeValue;\n addedNode.parentNode.insertBefore(wrapper, addedNode);\n addedNode.parentNode.removeChild(addedNode);\n }\n } break;\n }\n }\n }\n }).observe(this, {childList: true});\n }\n\n }\n\n var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};\n\n function createCommonjsModule(fn, module) {\n \treturn module = { exports: {} }, fn(module, module.exports), module.exports;\n }\n\n var bibtexParse = createCommonjsModule(function (module, exports) {\n /* start bibtexParse 0.0.22 */\n\n //Original work by Henrik Muehe (c) 2010\n //\n //CommonJS port by Mikola Lysenko 2013\n //\n //Port to Browser lib by ORCID / RCPETERS\n //\n //Issues:\n //no comment handling within strings\n //no string concatenation\n //no variable values yet\n //Grammar implemented here:\n //bibtex -> (string | preamble | comment | entry)*;\n //string -> '@STRING' '{' key_equals_value '}';\n //preamble -> '@PREAMBLE' '{' value '}';\n //comment -> '@COMMENT' '{' value '}';\n //entry -> '@' key '{' key ',' key_value_list '}';\n //key_value_list -> key_equals_value (',' key_equals_value)*;\n //key_equals_value -> key '=' value;\n //value -> value_quotes | value_braces | key;\n //value_quotes -> '\"' .*? '\"'; // not quite\n //value_braces -> '{' .*? '\"'; // not quite\n (function(exports) {\n\n function BibtexParser() {\n\n this.months = [\"jan\", \"feb\", \"mar\", \"apr\", \"may\", \"jun\", \"jul\", \"aug\", \"sep\", \"oct\", \"nov\", \"dec\"];\n this.notKey = [',','{','}',' ','='];\n this.pos = 0;\n this.input = \"\";\n this.entries = new Array();\n\n this.currentEntry = \"\";\n\n this.setInput = function(t) {\n this.input = t;\n };\n\n this.getEntries = function() {\n return this.entries;\n };\n\n this.isWhitespace = function(s) {\n return (s == ' ' || s == '\\r' || s == '\\t' || s == '\\n');\n };\n\n this.match = function(s, canCommentOut) {\n if (canCommentOut == undefined || canCommentOut == null)\n canCommentOut = true;\n this.skipWhitespace(canCommentOut);\n if (this.input.substring(this.pos, this.pos + s.length) == s) {\n this.pos += s.length;\n } else {\n throw \"Token mismatch, expected \" + s + \", found \"\n + this.input.substring(this.pos);\n } this.skipWhitespace(canCommentOut);\n };\n\n this.tryMatch = function(s, canCommentOut) {\n if (canCommentOut == undefined || canCommentOut == null)\n canCommentOut = true;\n this.skipWhitespace(canCommentOut);\n if (this.input.substring(this.pos, this.pos + s.length) == s) {\n return true;\n } else {\n return false;\n } };\n\n /* when search for a match all text can be ignored, not just white space */\n this.matchAt = function() {\n while (this.input.length > this.pos && this.input[this.pos] != '@') {\n this.pos++;\n }\n if (this.input[this.pos] == '@') {\n return true;\n } return false;\n };\n\n this.skipWhitespace = function(canCommentOut) {\n while (this.isWhitespace(this.input[this.pos])) {\n this.pos++;\n } if (this.input[this.pos] == \"%\" && canCommentOut == true) {\n while (this.input[this.pos] != \"\\n\") {\n this.pos++;\n } this.skipWhitespace(canCommentOut);\n } };\n\n this.value_braces = function() {\n var bracecount = 0;\n this.match(\"{\", false);\n var start = this.pos;\n var escaped = false;\n while (true) {\n if (!escaped) {\n if (this.input[this.pos] == '}') {\n if (bracecount > 0) {\n bracecount--;\n } else {\n var end = this.pos;\n this.match(\"}\", false);\n return this.input.substring(start, end);\n } } else if (this.input[this.pos] == '{') {\n bracecount++;\n } else if (this.pos >= this.input.length - 1) {\n throw \"Unterminated value\";\n } } if (this.input[this.pos] == '\\\\' && escaped == false)\n escaped = true;\n else\n escaped = false;\n this.pos++;\n } };\n\n this.value_comment = function() {\n var str = '';\n var brcktCnt = 0;\n while (!(this.tryMatch(\"}\", false) && brcktCnt == 0)) {\n str = str + this.input[this.pos];\n if (this.input[this.pos] == '{')\n brcktCnt++;\n if (this.input[this.pos] == '}')\n brcktCnt--;\n if (this.pos >= this.input.length - 1) {\n throw \"Unterminated value:\" + this.input.substring(start);\n } this.pos++;\n } return str;\n };\n\n this.value_quotes = function() {\n this.match('\"', false);\n var start = this.pos;\n var escaped = false;\n while (true) {\n if (!escaped) {\n if (this.input[this.pos] == '\"') {\n var end = this.pos;\n this.match('\"', false);\n return this.input.substring(start, end);\n } else if (this.pos >= this.input.length - 1) {\n throw \"Unterminated value:\" + this.input.substring(start);\n } }\n if (this.input[this.pos] == '\\\\' && escaped == false)\n escaped = true;\n else\n escaped = false;\n this.pos++;\n } };\n\n this.single_value = function() {\n var start = this.pos;\n if (this.tryMatch(\"{\")) {\n return this.value_braces();\n } else if (this.tryMatch('\"')) {\n return this.value_quotes();\n } else {\n var k = this.key();\n if (k.match(\"^[0-9]+$\"))\n return k;\n else if (this.months.indexOf(k.toLowerCase()) >= 0)\n return k.toLowerCase();\n else\n throw \"Value expected:\" + this.input.substring(start) + ' for key: ' + k;\n\n } };\n\n this.value = function() {\n var values = [];\n values.push(this.single_value());\n while (this.tryMatch(\"#\")) {\n this.match(\"#\");\n values.push(this.single_value());\n } return values.join(\"\");\n };\n\n this.key = function() {\n var start = this.pos;\n while (true) {\n if (this.pos >= this.input.length) {\n throw \"Runaway key\";\n } // а-яА-Я is Cyrillic\n //console.log(this.input[this.pos]);\n if (this.notKey.indexOf(this.input[this.pos]) >= 0) {\n return this.input.substring(start, this.pos);\n } else {\n this.pos++;\n\n } } };\n\n this.key_equals_value = function() {\n var key = this.key();\n if (this.tryMatch(\"=\")) {\n this.match(\"=\");\n var val = this.value();\n return [ key, val ];\n } else {\n throw \"... = value expected, equals sign missing:\"\n + this.input.substring(this.pos);\n } };\n\n this.key_value_list = function() {\n var kv = this.key_equals_value();\n this.currentEntry['entryTags'] = {};\n this.currentEntry['entryTags'][kv[0]] = kv[1];\n while (this.tryMatch(\",\")) {\n this.match(\",\");\n // fixes problems with commas at the end of a list\n if (this.tryMatch(\"}\")) {\n break;\n }\n kv = this.key_equals_value();\n this.currentEntry['entryTags'][kv[0]] = kv[1];\n } };\n\n this.entry_body = function(d) {\n this.currentEntry = {};\n this.currentEntry['citationKey'] = this.key();\n this.currentEntry['entryType'] = d.substring(1);\n this.match(\",\");\n this.key_value_list();\n this.entries.push(this.currentEntry);\n };\n\n this.directive = function() {\n this.match(\"@\");\n return \"@\" + this.key();\n };\n\n this.preamble = function() {\n this.currentEntry = {};\n this.currentEntry['entryType'] = 'PREAMBLE';\n this.currentEntry['entry'] = this.value_comment();\n this.entries.push(this.currentEntry);\n };\n\n this.comment = function() {\n this.currentEntry = {};\n this.currentEntry['entryType'] = 'COMMENT';\n this.currentEntry['entry'] = this.value_comment();\n this.entries.push(this.currentEntry);\n };\n\n this.entry = function(d) {\n this.entry_body(d);\n };\n\n this.bibtex = function() {\n while (this.matchAt()) {\n var d = this.directive();\n this.match(\"{\");\n if (d == \"@STRING\") {\n this.string();\n } else if (d == \"@PREAMBLE\") {\n this.preamble();\n } else if (d == \"@COMMENT\") {\n this.comment();\n } else {\n this.entry(d);\n }\n this.match(\"}\");\n } };\n }\n exports.toJSON = function(bibtex) {\n var b = new BibtexParser();\n b.setInput(bibtex);\n b.bibtex();\n return b.entries;\n };\n\n /* added during hackathon don't hate on me */\n exports.toBibtex = function(json) {\n var out = '';\n for ( var i in json) {\n out += \"@\" + json[i].entryType;\n out += '{';\n if (json[i].citationKey)\n out += json[i].citationKey + ', ';\n if (json[i].entry)\n out += json[i].entry ;\n if (json[i].entryTags) {\n var tags = '';\n for (var jdx in json[i].entryTags) {\n if (tags.length != 0)\n tags += ', ';\n tags += jdx + '= {' + json[i].entryTags[jdx] + '}';\n }\n out += tags;\n }\n out += '}\\n\\n';\n }\n return out;\n\n };\n\n })( exports);\n\n /* end bibtexParse */\n });\n\n // Copyright 2018 The Distill Template Authors\n\n function normalizeTag(string) {\n return string\n .replace(/[\\t\\n ]+/g, ' ')\n .replace(/{\\\\[\"^`.'acu~Hvs]( )?([a-zA-Z])}/g, (full, x, char) => char)\n .replace(/{\\\\([a-zA-Z])}/g, (full, char) => char);\n }\n\n function parseBibtex(bibtex) {\n const bibliography = new Map();\n const parsedEntries = bibtexParse.toJSON(bibtex);\n for (const entry of parsedEntries) {\n // normalize tags; note entryTags is an object, not Map\n for (const [key, value] of Object.entries(entry.entryTags)) {\n entry.entryTags[key.toLowerCase()] = normalizeTag(value);\n }\n entry.entryTags.type = entry.entryType;\n // add to bibliography\n bibliography.set(entry.citationKey, entry.entryTags);\n }\n return bibliography;\n }\n\n function serializeFrontmatterToBibtex(frontMatter) {\n return `@article{${frontMatter.slug},\n author = {${frontMatter.bibtexAuthors}},\n title = {${frontMatter.title}},\n journal = {${frontMatter.journal.title}},\n year = {${frontMatter.publishedYear}},\n note = {${frontMatter.url}},\n doi = {${frontMatter.doi}}\n}`;\n }\n\n // Copyright 2018 The Distill Template Authors\n\n class Bibliography extends HTMLElement {\n\n static get is() { return 'd-bibliography'; }\n\n constructor() {\n super();\n\n // set up mutation observer\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver( (entries) => {\n for (const entry of entries) {\n if (entry.target.nodeName === 'SCRIPT' || entry.type === 'characterData') {\n this.parseIfPossible();\n }\n }\n });\n observer.observe(this, options);\n }\n\n connectedCallback() {\n requestAnimationFrame(() => {\n this.parseIfPossible();\n });\n }\n\n parseIfPossible() {\n const scriptTag = this.querySelector('script');\n if (!scriptTag) return;\n if (scriptTag.type == 'text/bibtex') {\n const newBibtex = scriptTag.textContent;\n if (this.bibtex !== newBibtex) {\n this.bibtex = newBibtex;\n const bibliography = parseBibtex(this.bibtex);\n this.notify(bibliography);\n }\n } else if (scriptTag.type == 'text/json') {\n const bibliography = new Map(JSON.parse(scriptTag.textContent));\n this.notify(bibliography);\n } else {\n console.warn('Unsupported bibliography script tag type: ' + scriptTag.type);\n }\n }\n\n notify(bibliography) {\n const options = { detail: bibliography, bubbles: true };\n const event = new CustomEvent('onBibliographyChanged', options);\n this.dispatchEvent(event);\n }\n\n /* observe 'src' attribute */\n\n static get observedAttributes() {\n return ['src'];\n }\n\n receivedBibtex(event) {\n const bibliography = parseBibtex(event.target.response);\n this.notify(bibliography);\n }\n\n attributeChangedCallback(name, oldValue, newValue) {\n var oReq = new XMLHttpRequest();\n oReq.onload = (e) => this.receivedBibtex(e);\n oReq.onerror = () => console.warn(`Could not load Bibtex! (tried ${newValue})`);\n oReq.responseType = 'text';\n oReq.open('GET', newValue, true);\n oReq.send();\n }\n\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // import style from '../styles/d-byline.css';\n\n function bylineTemplate(frontMatter) {\n return `\n

      \n
      \n

      Authors

      \n
      \n ${frontMatter.authors.map((author, i) => `\n \n ${author.personalURL ? `\n ${author.name}` + (i + 1 < frontMatter.authors.length ? `,` : ``) + `` : `\n ${author.name}` + (i + 1 < frontMatter.authors.length ? `,` : ``) + ``}\n \n `).join('')}\n
      \n
      \n
      \n

      Affiliation

      \n \n
      \n
      \n

      Published

      \n
      May 31, 2024
      \n
      \n
      \n`;\n }\n\n class Byline extends HTMLElement {\n\n static get is() { return 'd-byline'; }\n\n set frontMatter(frontMatter) {\n this.innerHTML = bylineTemplate(frontMatter);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$3 = Template(\n \"d-cite\",\n `\n\n\n\n\n
      \n \n
      \n`\n );\n\n class Cite extends T$3(HTMLElement) {\n /* Lifecycle */\n constructor() {\n super();\n this._numbers = [];\n this._entries = [];\n }\n\n connectedCallback() {\n this.outerSpan = this.root.querySelector(\"#citation-\");\n this.innerSpan = this.root.querySelector(\".citation-number\");\n this.hoverBox = this.root.querySelector(\"d-hover-box\");\n window.customElements.whenDefined(\"d-hover-box\").then(() => {\n this.hoverBox.listen(this);\n });\n // in case this component got connected after values were set\n if (this.numbers) {\n this.displayNumbers(this.numbers);\n }\n if (this.entries) {\n this.displayEntries(this.entries);\n }\n }\n\n //TODO This causes an infinite loop on firefox with polyfills.\n // This is only needed for interactive editing so no priority.\n // disconnectedCallback() {\n // const options = { detail: [this, this.keys], bubbles: true };\n // const event = new CustomEvent('onCiteKeyRemoved', options);\n // document.dispatchEvent(event);\n // }\n\n /* observe 'key' attribute */\n\n static get observedAttributes() {\n return [\"key\", \"bibtex-key\"];\n }\n\n attributeChangedCallback(name, oldValue, newValue) {\n const eventName = oldValue ? \"onCiteKeyChanged\" : \"onCiteKeyCreated\";\n const keys = newValue.split(\",\").map(k => k.trim());\n const options = { detail: [this, keys], bubbles: true };\n const event = new CustomEvent(eventName, options);\n document.dispatchEvent(event);\n }\n\n set key(value) {\n this.setAttribute(\"key\", value);\n }\n\n get key() {\n return this.getAttribute(\"key\") || this.getAttribute(\"bibtex-key\");\n }\n\n get keys() {\n const result = this.key.split(\",\");\n console.log(result);\n return result;\n }\n\n /* Setters & Rendering */\n\n set numbers(numbers) {\n this._numbers = numbers;\n this.displayNumbers(numbers);\n }\n\n get numbers() {\n return this._numbers;\n }\n\n displayNumbers(numbers) {\n if (!this.innerSpan) return;\n const numberStrings = numbers.map(index => {\n return index == -1 ? \"?\" : index + 1 + \"\";\n });\n const textContent = \"[\" + numberStrings.join(\", \") + \"]\";\n this.innerSpan.textContent = textContent;\n }\n\n set entries(entries) {\n this._entries = entries;\n this.displayEntries(entries);\n }\n\n get entries() {\n return this._entries;\n }\n\n displayEntries(entries) {\n if (!this.hoverBox) return;\n this.hoverBox.innerHTML = `
        \n ${entries\n .map(hover_cite)\n .map(html => `
      • ${html}
        • `)\n .join(\"\\n\")}\n
      `;\n }\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const styles$1 = `\nd-citation-list {\n contain: style;\n}\n\nd-citation-list .references {\n grid-column: text;\n}\n\nd-citation-list .references .title {\n font-weight: 500;\n}\n`;\n\n function renderCitationList(element, entries, dom=document) {\n if (entries.size > 0) {\n element.style.display = '';\n let list = element.querySelector('.references');\n if (list) {\n list.innerHTML = '';\n } else {\n const stylesTag = dom.createElement('style');\n stylesTag.innerHTML = styles$1;\n element.appendChild(stylesTag);\n\n const heading = dom.createElement('h3');\n heading.id = 'references';\n heading.textContent = 'References';\n element.appendChild(heading);\n\n list = dom.createElement('ol');\n list.id = 'references-list';\n list.className = 'references';\n element.appendChild(list);\n }\n\n for (const [key, entry] of entries) {\n const listItem = dom.createElement('li');\n listItem.id = key;\n listItem.innerHTML = bibliography_cite(entry);\n list.appendChild(listItem);\n }\n } else {\n element.style.display = 'none';\n }\n }\n\n class CitationList extends HTMLElement {\n\n static get is() { return 'd-citation-list'; }\n\n connectedCallback() {\n if (!this.hasAttribute('distill-prerendered')) {\n this.style.display = 'none';\n }\n }\n\n set citations(citations) {\n renderCitationList(this, citations);\n }\n\n }\n\n var prism = createCommonjsModule(function (module) {\n /* **********************************************\n Begin prism-core.js\n ********************************************** */\n\n var _self = (typeof window !== 'undefined')\n \t? window // if in browser\n \t: (\n \t\t(typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)\n \t\t? self // if in worker\n \t\t: {} // if in node js\n \t);\n\n /**\n * Prism: Lightweight, robust, elegant syntax highlighting\n * MIT license http://www.opensource.org/licenses/mit-license.php/\n * @author Lea Verou http://lea.verou.me\n */\n\n var Prism = (function (_self){\n\n // Private helper vars\n var lang = /\\blang(?:uage)?-([\\w-]+)\\b/i;\n var uniqueId = 0;\n\n\n var _ = {\n \tmanual: _self.Prism && _self.Prism.manual,\n \tdisableWorkerMessageHandler: _self.Prism && _self.Prism.disableWorkerMessageHandler,\n \tutil: {\n \t\tencode: function encode(tokens) {\n \t\t\tif (tokens instanceof Token) {\n \t\t\t\treturn new Token(tokens.type, encode(tokens.content), tokens.alias);\n \t\t\t} else if (Array.isArray(tokens)) {\n \t\t\t\treturn tokens.map(encode);\n \t\t\t} else {\n \t\t\t\treturn tokens.replace(/&/g, '&').replace(/' + env.content + '';\n };\n\n /**\n * @param {string} text\n * @param {LinkedList} tokenList\n * @param {any} grammar\n * @param {LinkedListNode} startNode\n * @param {number} startPos\n * @param {boolean} [oneshot=false]\n * @param {string} [target]\n */\n function matchGrammar(text, tokenList, grammar, startNode, startPos, oneshot, target) {\n \tfor (var token in grammar) {\n \t\tif (!grammar.hasOwnProperty(token) || !grammar[token]) {\n \t\t\tcontinue;\n \t\t}\n\n \t\tvar patterns = grammar[token];\n \t\tpatterns = Array.isArray(patterns) ? patterns : [patterns];\n\n \t\tfor (var j = 0; j < patterns.length; ++j) {\n \t\t\tif (target && target == token + ',' + j) {\n \t\t\t\treturn;\n \t\t\t}\n\n \t\t\tvar pattern = patterns[j],\n \t\t\t\tinside = pattern.inside,\n \t\t\t\tlookbehind = !!pattern.lookbehind,\n \t\t\t\tgreedy = !!pattern.greedy,\n \t\t\t\tlookbehindLength = 0,\n \t\t\t\talias = pattern.alias;\n\n \t\t\tif (greedy && !pattern.pattern.global) {\n \t\t\t\t// Without the global flag, lastIndex won't work\n \t\t\t\tvar flags = pattern.pattern.toString().match(/[imsuy]*$/)[0];\n \t\t\t\tpattern.pattern = RegExp(pattern.pattern.source, flags + 'g');\n \t\t\t}\n\n \t\t\tpattern = pattern.pattern || pattern;\n\n \t\t\tfor ( // iterate the token list and keep track of the current token/string position\n \t\t\t\tvar currentNode = startNode.next, pos = startPos;\n \t\t\t\tcurrentNode !== tokenList.tail;\n \t\t\t\tpos += currentNode.value.length, currentNode = currentNode.next\n \t\t\t) {\n\n \t\t\t\tvar str = currentNode.value;\n\n \t\t\t\tif (tokenList.length > text.length) {\n \t\t\t\t\t// Something went terribly wrong, ABORT, ABORT!\n \t\t\t\t\treturn;\n \t\t\t\t}\n\n \t\t\t\tif (str instanceof Token) {\n \t\t\t\t\tcontinue;\n \t\t\t\t}\n\n \t\t\t\tvar removeCount = 1; // this is the to parameter of removeBetween\n\n \t\t\t\tif (greedy && currentNode != tokenList.tail.prev) {\n \t\t\t\t\tpattern.lastIndex = pos;\n \t\t\t\t\tvar match = pattern.exec(text);\n \t\t\t\t\tif (!match) {\n \t\t\t\t\t\tbreak;\n \t\t\t\t\t}\n\n \t\t\t\t\tvar from = match.index + (lookbehind && match[1] ? match[1].length : 0);\n \t\t\t\t\tvar to = match.index + match[0].length;\n \t\t\t\t\tvar p = pos;\n\n \t\t\t\t\t// find the node that contains the match\n \t\t\t\t\tp += currentNode.value.length;\n \t\t\t\t\twhile (from >= p) {\n \t\t\t\t\t\tcurrentNode = currentNode.next;\n \t\t\t\t\t\tp += currentNode.value.length;\n \t\t\t\t\t}\n \t\t\t\t\t// adjust pos (and p)\n \t\t\t\t\tp -= currentNode.value.length;\n \t\t\t\t\tpos = p;\n\n \t\t\t\t\t// the current node is a Token, then the match starts inside another Token, which is invalid\n \t\t\t\t\tif (currentNode.value instanceof Token) {\n \t\t\t\t\t\tcontinue;\n \t\t\t\t\t}\n\n \t\t\t\t\t// find the last node which is affected by this match\n \t\t\t\t\tfor (\n \t\t\t\t\t\tvar k = currentNode;\n \t\t\t\t\t\tk !== tokenList.tail && (p < to || (typeof k.value === 'string' && !k.prev.value.greedy));\n \t\t\t\t\t\tk = k.next\n \t\t\t\t\t) {\n \t\t\t\t\t\tremoveCount++;\n \t\t\t\t\t\tp += k.value.length;\n \t\t\t\t\t}\n \t\t\t\t\tremoveCount--;\n\n \t\t\t\t\t// replace with the new match\n \t\t\t\t\tstr = text.slice(pos, p);\n \t\t\t\t\tmatch.index -= pos;\n \t\t\t\t} else {\n \t\t\t\t\tpattern.lastIndex = 0;\n\n \t\t\t\t\tvar match = pattern.exec(str);\n \t\t\t\t}\n\n \t\t\t\tif (!match) {\n \t\t\t\t\tif (oneshot) {\n \t\t\t\t\t\tbreak;\n \t\t\t\t\t}\n\n \t\t\t\t\tcontinue;\n \t\t\t\t}\n\n \t\t\t\tif (lookbehind) {\n \t\t\t\t\tlookbehindLength = match[1] ? match[1].length : 0;\n \t\t\t\t}\n\n \t\t\t\tvar from = match.index + lookbehindLength,\n \t\t\t\t\tmatch = match[0].slice(lookbehindLength),\n \t\t\t\t\tto = from + match.length,\n \t\t\t\t\tbefore = str.slice(0, from),\n \t\t\t\t\tafter = str.slice(to);\n\n \t\t\t\tvar removeFrom = currentNode.prev;\n\n \t\t\t\tif (before) {\n \t\t\t\t\tremoveFrom = addAfter(tokenList, removeFrom, before);\n \t\t\t\t\tpos += before.length;\n \t\t\t\t}\n\n \t\t\t\tremoveRange(tokenList, removeFrom, removeCount);\n\n \t\t\t\tvar wrapped = new Token(token, inside ? _.tokenize(match, inside) : match, alias, match, greedy);\n \t\t\t\tcurrentNode = addAfter(tokenList, removeFrom, wrapped);\n\n \t\t\t\tif (after) {\n \t\t\t\t\taddAfter(tokenList, currentNode, after);\n \t\t\t\t}\n\n\n \t\t\t\tif (removeCount > 1)\n \t\t\t\t\tmatchGrammar(text, tokenList, grammar, currentNode.prev, pos, true, token + ',' + j);\n\n \t\t\t\tif (oneshot)\n \t\t\t\t\tbreak;\n \t\t\t}\n \t\t}\n \t}\n }\n\n /**\n * @typedef LinkedListNode\n * @property {T} value\n * @property {LinkedListNode | null} prev The previous node.\n * @property {LinkedListNode | null} next The next node.\n * @template T\n */\n\n /**\n * @template T\n */\n function LinkedList() {\n \t/** @type {LinkedListNode} */\n \tvar head = { value: null, prev: null, next: null };\n \t/** @type {LinkedListNode} */\n \tvar tail = { value: null, prev: head, next: null };\n \thead.next = tail;\n\n \t/** @type {LinkedListNode} */\n \tthis.head = head;\n \t/** @type {LinkedListNode} */\n \tthis.tail = tail;\n \tthis.length = 0;\n }\n\n /**\n * Adds a new node with the given value to the list.\n * @param {LinkedList} list\n * @param {LinkedListNode} node\n * @param {T} value\n * @returns {LinkedListNode} The added node.\n * @template T\n */\n function addAfter(list, node, value) {\n \t// assumes that node != list.tail && values.length >= 0\n \tvar next = node.next;\n\n \tvar newNode = { value: value, prev: node, next: next };\n \tnode.next = newNode;\n \tnext.prev = newNode;\n \tlist.length++;\n\n \treturn newNode;\n }\n /**\n * Removes `count` nodes after the given node. The given node will not be removed.\n * @param {LinkedList} list\n * @param {LinkedListNode} node\n * @param {number} count\n * @template T\n */\n function removeRange(list, node, count) {\n \tvar next = node.next;\n \tfor (var i = 0; i < count && next !== list.tail; i++) {\n \t\tnext = next.next;\n \t}\n \tnode.next = next;\n \tnext.prev = node;\n \tlist.length -= i;\n }\n /**\n * @param {LinkedList} list\n * @returns {T[]}\n * @template T\n */\n function toArray(list) {\n \tvar array = [];\n \tvar node = list.head.next;\n \twhile (node !== list.tail) {\n \t\tarray.push(node.value);\n \t\tnode = node.next;\n \t}\n \treturn array;\n }\n\n\n if (!_self.document) {\n \tif (!_self.addEventListener) {\n \t\t// in Node.js\n \t\treturn _;\n \t}\n\n \tif (!_.disableWorkerMessageHandler) {\n \t\t// In worker\n \t\t_self.addEventListener('message', function (evt) {\n \t\t\tvar message = JSON.parse(evt.data),\n \t\t\t\tlang = message.language,\n \t\t\t\tcode = message.code,\n \t\t\t\timmediateClose = message.immediateClose;\n\n \t\t\t_self.postMessage(_.highlight(code, _.languages[lang], lang));\n \t\t\tif (immediateClose) {\n \t\t\t\t_self.close();\n \t\t\t}\n \t\t}, false);\n \t}\n\n \treturn _;\n }\n\n //Get current script and highlight\n var script = _.util.currentScript();\n\n if (script) {\n \t_.filename = script.src;\n\n \tif (script.hasAttribute('data-manual')) {\n \t\t_.manual = true;\n \t}\n }\n\n function highlightAutomaticallyCallback() {\n \tif (!_.manual) {\n \t\t_.highlightAll();\n \t}\n }\n\n if (!_.manual) {\n \t// If the document state is \"loading\", then we'll use DOMContentLoaded.\n \t// If the document state is \"interactive\" and the prism.js script is deferred, then we'll also use the\n \t// DOMContentLoaded event because there might be some plugins or languages which have also been deferred and they\n \t// might take longer one animation frame to execute which can create a race condition where only some plugins have\n \t// been loaded when Prism.highlightAll() is executed, depending on how fast resources are loaded.\n \t// See https://github.com/PrismJS/prism/issues/2102\n \tvar readyState = document.readyState;\n \tif (readyState === 'loading' || readyState === 'interactive' && script && script.defer) {\n \t\tdocument.addEventListener('DOMContentLoaded', highlightAutomaticallyCallback);\n \t} else {\n \t\tif (window.requestAnimationFrame) {\n \t\t\twindow.requestAnimationFrame(highlightAutomaticallyCallback);\n \t\t} else {\n \t\t\twindow.setTimeout(highlightAutomaticallyCallback, 16);\n \t\t}\n \t}\n }\n\n return _;\n\n })(_self);\n\n if ( module.exports) {\n \tmodule.exports = Prism;\n }\n\n // hack for components to work correctly in node.js\n if (typeof commonjsGlobal !== 'undefined') {\n \tcommonjsGlobal.Prism = Prism;\n }\n\n\n /* **********************************************\n Begin prism-markup.js\n ********************************************** */\n\n Prism.languages.markup = {\n \t'comment': //,\n \t'prolog': /<\\?[\\s\\S]+?\\?>/,\n \t'doctype': {\n \t\tpattern: /\"'[\\]]|\"[^\"]*\"|'[^']*')+(?:\\[(?:(?!)*\\]\\s*)?>/i,\n \t\tgreedy: true\n \t},\n \t'cdata': //i,\n \t'tag': {\n \t\tpattern: /<\\/?(?!\\d)[^\\s>\\/=$<%]+(?:\\s(?:\\s*[^\\s>\\/=]+(?:\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s'\">=]+(?=[\\s>]))|(?=[\\s/>])))+)?\\s*\\/?>/i,\n \t\tgreedy: true,\n \t\tinside: {\n \t\t\t'tag': {\n \t\t\t\tpattern: /^<\\/?[^\\s>\\/]+/i,\n \t\t\t\tinside: {\n \t\t\t\t\t'punctuation': /^<\\/?/,\n \t\t\t\t\t'namespace': /^[^\\s>\\/:]+:/\n \t\t\t\t}\n \t\t\t},\n \t\t\t'attr-value': {\n \t\t\t\tpattern: /=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s'\">=]+)/i,\n \t\t\t\tinside: {\n \t\t\t\t\t'punctuation': [\n \t\t\t\t\t\t/^=/,\n \t\t\t\t\t\t{\n \t\t\t\t\t\t\tpattern: /^(\\s*)[\"']|[\"']$/,\n \t\t\t\t\t\t\tlookbehind: true\n \t\t\t\t\t\t}\n \t\t\t\t\t]\n \t\t\t\t}\n \t\t\t},\n \t\t\t'punctuation': /\\/?>/,\n \t\t\t'attr-name': {\n \t\t\t\tpattern: /[^\\s>\\/]+/,\n \t\t\t\tinside: {\n \t\t\t\t\t'namespace': /^[^\\s>\\/:]+:/\n \t\t\t\t}\n \t\t\t}\n\n \t\t}\n \t},\n \t'entity': /&#?[\\da-z]{1,8};/i\n };\n\n Prism.languages.markup['tag'].inside['attr-value'].inside['entity'] =\n \tPrism.languages.markup['entity'];\n\n // Plugin to make entity title show the real entity, idea by Roman Komarov\n Prism.hooks.add('wrap', function(env) {\n\n \tif (env.type === 'entity') {\n \t\tenv.attributes['title'] = env.content.replace(/&/, '&');\n \t}\n });\n\n Object.defineProperty(Prism.languages.markup.tag, 'addInlined', {\n \t/**\n \t * Adds an inlined language to markup.\n \t *\n \t * An example of an inlined language is CSS with `\n\n\n\n`);\n\n class Code extends Mutating(T$4(HTMLElement)) {\n\n renderContent() {\n\n // check if language can be highlighted\n this.languageName = this.getAttribute('language');\n if (!this.languageName) {\n console.warn('You need to provide a language attribute to your block to let us know how to highlight your code; e.g.:\\n zeros = np.zeros(shape).');\n return;\n }\n const language = prism.languages[this.languageName];\n if (language == undefined) {\n console.warn(`Distill does not yet support highlighting your code block in \"${this.languageName}'.`);\n return;\n }\n\n let content = this.textContent;\n const codeTag = this.shadowRoot.querySelector('#code-container');\n\n if (this.hasAttribute('block')) {\n // normalize the tab indents\n content = content.replace(/\\n/, '');\n const tabs = content.match(/\\s*/);\n content = content.replace(new RegExp('\\n' + tabs, 'g'), '\\n');\n content = content.trim();\n // wrap code block in pre tag if needed\n if (codeTag.parentNode instanceof ShadowRoot) {\n const preTag = document.createElement('pre');\n this.shadowRoot.removeChild(codeTag);\n preTag.appendChild(codeTag);\n this.shadowRoot.appendChild(preTag);\n }\n\n }\n\n codeTag.className = `language-${this.languageName}`;\n codeTag.innerHTML = prism.highlight(content, language);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$5 = Template('d-footnote', `\n\n\n\n
      \n \n
      \n      \n\n\n \n\n\n`);\n\n class Footnote extends T$5(HTMLElement) {\n\n constructor() {\n super();\n\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver(this.notify);\n observer.observe(this, options);\n }\n\n notify() {\n const options = { detail: this, bubbles: true };\n const event = new CustomEvent('onFootnoteChanged', options);\n document.dispatchEvent(event);\n }\n\n connectedCallback() {\n // listen and notify about changes to slotted content\n // const slot = this.shadowRoot.querySelector('#slot');\n // console.warn(slot.textContent);\n // slot.addEventListener('slotchange', this.notify);\n this.hoverBox = this.root.querySelector('d-hover-box');\n window.customElements.whenDefined('d-hover-box').then(() => {\n this.hoverBox.listen(this);\n });\n // create numeric ID\n Footnote.currentFootnoteId += 1;\n const IdString = Footnote.currentFootnoteId.toString();\n this.root.host.id = 'd-footnote-' + IdString;\n\n // set up hidden hover box\n const id = 'dt-fn-hover-box-' + IdString;\n this.hoverBox.id = id;\n\n // set up visible footnote marker\n const span = this.root.querySelector('#fn-');\n span.setAttribute('id', 'fn-' + IdString);\n span.setAttribute('data-hover-ref', id);\n span.textContent = IdString;\n }\n\n }\n\n Footnote.currentFootnoteId = 0;\n\n // Copyright 2018 The Distill Template Authors\n\n const T$6 = Template('d-footnote-list', `\n\n\n

      Footnotes

      \n
        \n`, false);\n\n class FootnoteList extends T$6(HTMLElement) {\n\n connectedCallback() {\n super.connectedCallback();\n\n this.list = this.root.querySelector('ol');\n // footnotes list is initially hidden\n this.root.style.display = 'none';\n // look through document and register existing footnotes\n // Store.subscribeTo('footnotes', (footnote) => {\n // this.renderFootnote(footnote);\n // });\n }\n\n // TODO: could optimize this to accept individual footnotes?\n set footnotes(footnotes) {\n this.list.innerHTML = '';\n if (footnotes.length) {\n // ensure footnote list is visible\n this.root.style.display = '';\n\n for (const footnote of footnotes) {\n // construct and append list item to show footnote\n const listItem = document.createElement('li');\n listItem.id = footnote.id + '-listing';\n listItem.innerHTML = footnote.innerHTML;\n\n const backlink = document.createElement('a');\n backlink.setAttribute('class', 'footnote-backlink');\n backlink.setAttribute('target', '_self');\n backlink.textContent = '[↩]';\n backlink.href = '#' + footnote.id;\n\n listItem.appendChild(backlink);\n this.list.appendChild(listItem);\n }\n } else {\n // ensure footnote list is invisible\n this.root.style.display = 'none';\n }\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$7 = Template('d-hover-box', `\n\n\n
        \n
        \n \n
        \n
        \n`);\n\n class HoverBox extends T$7(HTMLElement) {\n\n constructor() {\n super();\n }\n\n connectedCallback() {\n\n }\n\n listen(element) {\n // console.log(element)\n this.bindDivEvents(this);\n this.bindTriggerEvents(element);\n // this.style.display = \"block\";\n }\n\n bindDivEvents(element) {\n // For mice, same behavior as hovering on links\n element.addEventListener('mouseover', () => {\n if (!this.visible) this.showAtNode(element);\n this.stopTimeout();\n });\n element.addEventListener('mouseout', () => {\n this.extendTimeout(500);\n });\n // Don't trigger body touchstart event when touching within box\n element.addEventListener('touchstart', (event) => {\n event.stopPropagation();\n }, {passive: true});\n // Close box when touching outside box\n document.body.addEventListener('touchstart', () => {\n this.hide();\n }, {passive: true});\n }\n\n bindTriggerEvents(node) {\n node.addEventListener('mouseover', () => {\n if (!this.visible) {\n this.showAtNode(node);\n }\n this.stopTimeout();\n });\n\n node.addEventListener('mouseout', () => {\n this.extendTimeout(300);\n });\n\n node.addEventListener('touchstart', (event) => {\n if (this.visible) {\n this.hide();\n } else {\n this.showAtNode(node);\n }\n // Don't trigger body touchstart event when touching link\n event.stopPropagation();\n }, {passive: true});\n }\n\n show(position) {\n this.visible = true;\n this.style.display = 'block';\n // 10px extra offset from element\n this.style.top = Math.round(position[1] + 10) + 'px';\n }\n\n showAtNode(node) {\n // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetTop\n const bbox = node.getBoundingClientRect();\n this.show([node.offsetLeft + bbox.width, node.offsetTop + bbox.height]);\n }\n\n hide() {\n this.visible = false;\n this.style.display = 'none';\n this.stopTimeout();\n }\n\n stopTimeout() {\n if (this.timeout) {\n clearTimeout(this.timeout);\n }\n }\n\n extendTimeout(time) {\n this.stopTimeout();\n this.timeout = setTimeout(() => {\n this.hide();\n }, time);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n class Title extends HTMLElement {\n static get is() { return 'd-title'; }\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$8 = Template('d-references', `\n\n`, false);\n\n class References extends T$8(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n class TOC extends HTMLElement {\n\n static get is() { return 'd-toc'; }\n\n connectedCallback() {\n if (!this.getAttribute('prerendered')) {\n window.onload = () => {\n const article = document.querySelector('d-article');\n const headings = article.querySelectorAll('h2, h3');\n renderTOC(this, headings);\n };\n }\n }\n\n }\n\n function renderTOC(element, headings) {\n\n let ToC =`\n \n \n

        Table of contents

        \n
          `;\n\n for (const el of headings) {\n // should element be included in TOC?\n const isInTitle = el.parentElement.tagName == 'D-TITLE';\n const isException = el.getAttribute('no-toc');\n if (isInTitle || isException) continue;\n // create TOC entry\n const title = el.textContent;\n const link = '#' + el.getAttribute('id');\n\n let newLine = '
        • ' + '' + title + '' + '
          • ';\n if (el.tagName == 'H3') {\n newLine = '
            ' + newLine + '
          ';\n } else {\n newLine += '
          ';\n }\n ToC += newLine;\n\n }\n\n ToC += '
        ';\n element.innerHTML = ToC;\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // Figure\n //\n // d-figure provides a state-machine of visibility events:\n //\n // scroll out of view\n // +----------------+\n // *do work here* | |\n // +----------------+ +-+---------+ +-v---------+\n // | ready +----> onscreen | | offscreen |\n // +----------------+ +---------^-+ +---------+-+\n // | |\n // +----------------+\n // scroll into view\n //\n\n class Figure extends HTMLElement {\n\n static get is() { return 'd-figure'; }\n\n static get readyQueue() {\n if (!Figure._readyQueue) {\n Figure._readyQueue = [];\n }\n return Figure._readyQueue;\n }\n\n static addToReadyQueue(figure) {\n if (Figure.readyQueue.indexOf(figure) === -1) {\n Figure.readyQueue.push(figure);\n Figure.runReadyQueue();\n }\n }\n\n static runReadyQueue() {\n // console.log(\"Checking to run readyQueue, length: \" + Figure.readyQueue.length + \", scrolling: \" + Figure.isScrolling);\n // if (Figure.isScrolling) return;\n // console.log(\"Running ready Queue\");\n const figure = Figure.readyQueue\n .sort((a,b) => a._seenOnScreen - b._seenOnScreen )\n .filter((figure) => !figure._ready)\n .pop();\n if (figure) {\n figure.ready();\n requestAnimationFrame(Figure.runReadyQueue);\n }\n\n }\n\n constructor() {\n super();\n // debugger\n this._ready = false;\n this._onscreen = false;\n this._offscreen = true;\n }\n\n connectedCallback() {\n this.loadsWhileScrolling = this.hasAttribute('loadsWhileScrolling');\n Figure.marginObserver.observe(this);\n Figure.directObserver.observe(this);\n }\n\n disconnectedCallback() {\n Figure.marginObserver.unobserve(this);\n Figure.directObserver.unobserve(this);\n }\n\n // We use two separate observers:\n // One with an extra 1000px margin to warn if the viewpoint gets close,\n // And one for the actual on/off screen events\n\n static get marginObserver() {\n if (!Figure._marginObserver) {\n // if (!('IntersectionObserver' in window)) {\n // throw new Error('no interscetionobbserver!');\n // }\n const viewportHeight = window.innerHeight;\n const margin = Math.floor(2 * viewportHeight);\n const options = {rootMargin: margin + 'px 0px ' + margin + 'px 0px', threshold: 0.01};\n const callback = Figure.didObserveMarginIntersection;\n const observer = new IntersectionObserver(callback, options);\n Figure._marginObserver = observer;\n }\n return Figure._marginObserver;\n }\n\n static didObserveMarginIntersection(entries) {\n for (const entry of entries) {\n const figure = entry.target;\n if (entry.isIntersecting && !figure._ready) {\n Figure.addToReadyQueue(figure);\n }\n }\n }\n\n static get directObserver() {\n if (!Figure._directObserver) {\n Figure._directObserver = new IntersectionObserver(\n Figure.didObserveDirectIntersection, {\n rootMargin: '0px', threshold: [0, 1.0],\n }\n );\n }\n return Figure._directObserver;\n }\n\n static didObserveDirectIntersection(entries) {\n for (const entry of entries) {\n const figure = entry.target;\n if (entry.isIntersecting) {\n figure._seenOnScreen = new Date();\n // if (!figure._ready) { figure.ready(); }\n if (figure._offscreen) { figure.onscreen(); }\n } else {\n if (figure._onscreen) { figure.offscreen(); }\n }\n }\n }\n\n // Notify listeners that registered late, too:\n\n addEventListener(eventName, callback) {\n super.addEventListener(eventName, callback);\n // if we had already dispatched something while presumingly no one was listening, we do so again\n // debugger\n if (eventName === 'ready') {\n if (Figure.readyQueue.indexOf(this) !== -1) {\n this._ready = false;\n Figure.runReadyQueue();\n }\n }\n if (eventName === 'onscreen') {\n this.onscreen();\n }\n }\n\n // Custom Events\n\n ready() {\n // debugger\n this._ready = true;\n Figure.marginObserver.unobserve(this);\n const event = new CustomEvent('ready');\n this.dispatchEvent(event);\n }\n\n onscreen() {\n this._onscreen = true;\n this._offscreen = false;\n const event = new CustomEvent('onscreen');\n this.dispatchEvent(event);\n }\n\n offscreen() {\n this._onscreen = false;\n this._offscreen = true;\n const event = new CustomEvent('offscreen');\n this.dispatchEvent(event);\n }\n\n }\n\n if (typeof window !== 'undefined') {\n\n Figure.isScrolling = false;\n let timeout;\n const resetTimer = () => {\n Figure.isScrolling = true;\n clearTimeout(timeout);\n timeout = setTimeout(() => {\n Figure.isScrolling = false;\n Figure.runReadyQueue();\n }, 500);\n };\n window.addEventListener('scroll', resetTimer, true);\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n // This overlay is not secure.\n // It is only meant as a social deterrent.\n\n const productionHostname = 'distill.pub';\n const T$9 = Template('d-interstitial', `\n\n\n
        \n
        \n

        This article is in review.

        \n

        Do not share this URL or the contents of this article. Thank you!

        \n \n

        Enter the password we shared with you as part of the review process to view the article.

        \n
        \n
        \n`);\n\n class Interstitial extends T$9(HTMLElement) {\n\n connectedCallback() {\n if (this.shouldRemoveSelf()) {\n this.parentElement.removeChild(this);\n } else {\n const passwordInput = this.root.querySelector('#interstitial-password-input');\n passwordInput.oninput = (event) => this.passwordChanged(event);\n }\n }\n\n passwordChanged(event) {\n const entered = event.target.value;\n if (entered === this.password) {\n console.log('Correct password entered.');\n this.parentElement.removeChild(this);\n if (typeof(Storage) !== 'undefined') {\n console.log('Saved that correct password was entered.');\n localStorage.setItem(this.localStorageIdentifier(), 'true');\n }\n }\n }\n\n shouldRemoveSelf() {\n // should never be visible in production\n if (window && window.location.hostname === productionHostname) {\n console.warn('Interstitial found on production, hiding it.');\n return true\n }\n // should only have to enter password once\n if (typeof(Storage) !== 'undefined') {\n if (localStorage.getItem(this.localStorageIdentifier()) === 'true') {\n console.log('Loaded that correct password was entered before; skipping interstitial.');\n return true;\n }\n }\n // otherwise, leave visible\n return false;\n }\n\n localStorageIdentifier() {\n const prefix = 'distill-drafts';\n const suffix = 'interstitial-password-correct';\n return prefix + (window ? window.location.pathname : '-') + suffix\n }\n\n }\n\n function ascending(a, b) {\n return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;\n }\n\n function bisector(compare) {\n if (compare.length === 1) compare = ascendingComparator(compare);\n return {\n left: function(a, x, lo, hi) {\n if (lo == null) lo = 0;\n if (hi == null) hi = a.length;\n while (lo < hi) {\n var mid = lo + hi >>> 1;\n if (compare(a[mid], x) < 0) lo = mid + 1;\n else hi = mid;\n }\n return lo;\n },\n right: function(a, x, lo, hi) {\n if (lo == null) lo = 0;\n if (hi == null) hi = a.length;\n while (lo < hi) {\n var mid = lo + hi >>> 1;\n if (compare(a[mid], x) > 0) hi = mid;\n else lo = mid + 1;\n }\n return lo;\n }\n };\n }\n\n function ascendingComparator(f) {\n return function(d, x) {\n return ascending(f(d), x);\n };\n }\n\n var ascendingBisect = bisector(ascending);\n var bisectRight = ascendingBisect.right;\n\n function range(start, stop, step) {\n start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;\n\n var i = -1,\n n = Math.max(0, Math.ceil((stop - start) / step)) | 0,\n range = new Array(n);\n\n while (++i < n) {\n range[i] = start + i * step;\n }\n\n return range;\n }\n\n var e10 = Math.sqrt(50),\n e5 = Math.sqrt(10),\n e2 = Math.sqrt(2);\n\n function ticks(start, stop, count) {\n var reverse,\n i = -1,\n n,\n ticks,\n step;\n\n stop = +stop, start = +start, count = +count;\n if (start === stop && count > 0) return [start];\n if (reverse = stop < start) n = start, start = stop, stop = n;\n if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];\n\n if (step > 0) {\n start = Math.ceil(start / step);\n stop = Math.floor(stop / step);\n ticks = new Array(n = Math.ceil(stop - start + 1));\n while (++i < n) ticks[i] = (start + i) * step;\n } else {\n start = Math.floor(start * step);\n stop = Math.ceil(stop * step);\n ticks = new Array(n = Math.ceil(start - stop + 1));\n while (++i < n) ticks[i] = (start - i) / step;\n }\n\n if (reverse) ticks.reverse();\n\n return ticks;\n }\n\n function tickIncrement(start, stop, count) {\n var step = (stop - start) / Math.max(0, count),\n power = Math.floor(Math.log(step) / Math.LN10),\n error = step / Math.pow(10, power);\n return power >= 0\n ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)\n : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);\n }\n\n function tickStep(start, stop, count) {\n var step0 = Math.abs(stop - start) / Math.max(0, count),\n step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),\n error = step0 / step1;\n if (error >= e10) step1 *= 10;\n else if (error >= e5) step1 *= 5;\n else if (error >= e2) step1 *= 2;\n return stop < start ? -step1 : step1;\n }\n\n function initRange(domain, range) {\n switch (arguments.length) {\n case 0: break;\n case 1: this.range(domain); break;\n default: this.range(range).domain(domain); break;\n }\n return this;\n }\n\n function define(constructor, factory, prototype) {\n constructor.prototype = factory.prototype = prototype;\n prototype.constructor = constructor;\n }\n\n function extend(parent, definition) {\n var prototype = Object.create(parent.prototype);\n for (var key in definition) prototype[key] = definition[key];\n return prototype;\n }\n\n function Color() {}\n\n var darker = 0.7;\n var brighter = 1 / darker;\n\n var reI = \"\\\\s*([+-]?\\\\d+)\\\\s*\",\n reN = \"\\\\s*([+-]?\\\\d*\\\\.?\\\\d+(?:[eE][+-]?\\\\d+)?)\\\\s*\",\n reP = \"\\\\s*([+-]?\\\\d*\\\\.?\\\\d+(?:[eE][+-]?\\\\d+)?)%\\\\s*\",\n reHex = /^#([0-9a-f]{3,8})$/,\n reRgbInteger = new RegExp(\"^rgb\\\\(\" + [reI, reI, reI] + \"\\\\)$\"),\n reRgbPercent = new RegExp(\"^rgb\\\\(\" + [reP, reP, reP] + \"\\\\)$\"),\n reRgbaInteger = new RegExp(\"^rgba\\\\(\" + [reI, reI, reI, reN] + \"\\\\)$\"),\n reRgbaPercent = new RegExp(\"^rgba\\\\(\" + [reP, reP, reP, reN] + \"\\\\)$\"),\n reHslPercent = new RegExp(\"^hsl\\\\(\" + [reN, reP, reP] + \"\\\\)$\"),\n reHslaPercent = new RegExp(\"^hsla\\\\(\" + [reN, reP, reP, reN] + \"\\\\)$\");\n\n var named = {\n aliceblue: 0xf0f8ff,\n antiquewhite: 0xfaebd7,\n aqua: 0x00ffff,\n aquamarine: 0x7fffd4,\n azure: 0xf0ffff,\n beige: 0xf5f5dc,\n bisque: 0xffe4c4,\n black: 0x000000,\n blanchedalmond: 0xffebcd,\n blue: 0x0000ff,\n blueviolet: 0x8a2be2,\n brown: 0xa52a2a,\n burlywood: 0xdeb887,\n cadetblue: 0x5f9ea0,\n chartreuse: 0x7fff00,\n chocolate: 0xd2691e,\n coral: 0xff7f50,\n cornflowerblue: 0x6495ed,\n cornsilk: 0xfff8dc,\n crimson: 0xdc143c,\n cyan: 0x00ffff,\n darkblue: 0x00008b,\n darkcyan: 0x008b8b,\n darkgoldenrod: 0xb8860b,\n darkgray: 0xa9a9a9,\n darkgreen: 0x006400,\n darkgrey: 0xa9a9a9,\n darkkhaki: 0xbdb76b,\n darkmagenta: 0x8b008b,\n darkolivegreen: 0x556b2f,\n darkorange: 0xff8c00,\n darkorchid: 0x9932cc,\n darkred: 0x8b0000,\n darksalmon: 0xe9967a,\n darkseagreen: 0x8fbc8f,\n darkslateblue: 0x483d8b,\n darkslategray: 0x2f4f4f,\n darkslategrey: 0x2f4f4f,\n darkturquoise: 0x00ced1,\n darkviolet: 0x9400d3,\n deeppink: 0xff1493,\n deepskyblue: 0x00bfff,\n dimgray: 0x696969,\n dimgrey: 0x696969,\n dodgerblue: 0x1e90ff,\n firebrick: 0xb22222,\n floralwhite: 0xfffaf0,\n forestgreen: 0x228b22,\n fuchsia: 0xff00ff,\n gainsboro: 0xdcdcdc,\n ghostwhite: 0xf8f8ff,\n gold: 0xffd700,\n goldenrod: 0xdaa520,\n gray: 0x808080,\n green: 0x008000,\n greenyellow: 0xadff2f,\n grey: 0x808080,\n honeydew: 0xf0fff0,\n hotpink: 0xff69b4,\n indianred: 0xcd5c5c,\n indigo: 0x4b0082,\n ivory: 0xfffff0,\n khaki: 0xf0e68c,\n lavender: 0xe6e6fa,\n lavenderblush: 0xfff0f5,\n lawngreen: 0x7cfc00,\n lemonchiffon: 0xfffacd,\n lightblue: 0xadd8e6,\n lightcoral: 0xf08080,\n lightcyan: 0xe0ffff,\n lightgoldenrodyellow: 0xfafad2,\n lightgray: 0xd3d3d3,\n lightgreen: 0x90ee90,\n lightgrey: 0xd3d3d3,\n lightpink: 0xffb6c1,\n lightsalmon: 0xffa07a,\n lightseagreen: 0x20b2aa,\n lightskyblue: 0x87cefa,\n lightslategray: 0x778899,\n lightslategrey: 0x778899,\n lightsteelblue: 0xb0c4de,\n lightyellow: 0xffffe0,\n lime: 0x00ff00,\n limegreen: 0x32cd32,\n linen: 0xfaf0e6,\n magenta: 0xff00ff,\n maroon: 0x800000,\n mediumaquamarine: 0x66cdaa,\n mediumblue: 0x0000cd,\n mediumorchid: 0xba55d3,\n mediumpurple: 0x9370db,\n mediumseagreen: 0x3cb371,\n mediumslateblue: 0x7b68ee,\n mediumspringgreen: 0x00fa9a,\n mediumturquoise: 0x48d1cc,\n mediumvioletred: 0xc71585,\n midnightblue: 0x191970,\n mintcream: 0xf5fffa,\n mistyrose: 0xffe4e1,\n moccasin: 0xffe4b5,\n navajowhite: 0xffdead,\n navy: 0x000080,\n oldlace: 0xfdf5e6,\n olive: 0x808000,\n olivedrab: 0x6b8e23,\n orange: 0xffa500,\n orangered: 0xff4500,\n orchid: 0xda70d6,\n palegoldenrod: 0xeee8aa,\n palegreen: 0x98fb98,\n paleturquoise: 0xafeeee,\n palevioletred: 0xdb7093,\n papayawhip: 0xffefd5,\n peachpuff: 0xffdab9,\n peru: 0xcd853f,\n pink: 0xffc0cb,\n plum: 0xdda0dd,\n powderblue: 0xb0e0e6,\n purple: 0x800080,\n rebeccapurple: 0x663399,\n red: 0xff0000,\n rosybrown: 0xbc8f8f,\n royalblue: 0x4169e1,\n saddlebrown: 0x8b4513,\n salmon: 0xfa8072,\n sandybrown: 0xf4a460,\n seagreen: 0x2e8b57,\n seashell: 0xfff5ee,\n sienna: 0xa0522d,\n silver: 0xc0c0c0,\n skyblue: 0x87ceeb,\n slateblue: 0x6a5acd,\n slategray: 0x708090,\n slategrey: 0x708090,\n snow: 0xfffafa,\n springgreen: 0x00ff7f,\n steelblue: 0x4682b4,\n tan: 0xd2b48c,\n teal: 0x008080,\n thistle: 0xd8bfd8,\n tomato: 0xff6347,\n turquoise: 0x40e0d0,\n violet: 0xee82ee,\n wheat: 0xf5deb3,\n white: 0xffffff,\n whitesmoke: 0xf5f5f5,\n yellow: 0xffff00,\n yellowgreen: 0x9acd32\n };\n\n define(Color, color, {\n copy: function(channels) {\n return Object.assign(new this.constructor, this, channels);\n },\n displayable: function() {\n return this.rgb().displayable();\n },\n hex: color_formatHex, // Deprecated! Use color.formatHex.\n formatHex: color_formatHex,\n formatHsl: color_formatHsl,\n formatRgb: color_formatRgb,\n toString: color_formatRgb\n });\n\n function color_formatHex() {\n return this.rgb().formatHex();\n }\n\n function color_formatHsl() {\n return hslConvert(this).formatHsl();\n }\n\n function color_formatRgb() {\n return this.rgb().formatRgb();\n }\n\n function color(format) {\n var m, l;\n format = (format + \"\").trim().toLowerCase();\n return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000\n : l === 3 ? new Rgb((m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1) // #f00\n : l === 8 ? rgba(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000\n : l === 4 ? rgba((m >> 12 & 0xf) | (m >> 8 & 0xf0), (m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), (((m & 0xf) << 4) | (m & 0xf)) / 0xff) // #f000\n : null) // invalid hex\n : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)\n : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)\n : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)\n : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)\n : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)\n : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)\n : named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins\n : format === \"transparent\" ? new Rgb(NaN, NaN, NaN, 0)\n : null;\n }\n\n function rgbn(n) {\n return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);\n }\n\n function rgba(r, g, b, a) {\n if (a <= 0) r = g = b = NaN;\n return new Rgb(r, g, b, a);\n }\n\n function rgbConvert(o) {\n if (!(o instanceof Color)) o = color(o);\n if (!o) return new Rgb;\n o = o.rgb();\n return new Rgb(o.r, o.g, o.b, o.opacity);\n }\n\n function rgb(r, g, b, opacity) {\n return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);\n }\n\n function Rgb(r, g, b, opacity) {\n this.r = +r;\n this.g = +g;\n this.b = +b;\n this.opacity = +opacity;\n }\n\n define(Rgb, rgb, extend(Color, {\n brighter: function(k) {\n k = k == null ? brighter : Math.pow(brighter, k);\n return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);\n },\n darker: function(k) {\n k = k == null ? darker : Math.pow(darker, k);\n return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);\n },\n rgb: function() {\n return this;\n },\n displayable: function() {\n return (-0.5 <= this.r && this.r < 255.5)\n && (-0.5 <= this.g && this.g < 255.5)\n && (-0.5 <= this.b && this.b < 255.5)\n && (0 <= this.opacity && this.opacity <= 1);\n },\n hex: rgb_formatHex, // Deprecated! Use color.formatHex.\n formatHex: rgb_formatHex,\n formatRgb: rgb_formatRgb,\n toString: rgb_formatRgb\n }));\n\n function rgb_formatHex() {\n return \"#\" + hex(this.r) + hex(this.g) + hex(this.b);\n }\n\n function rgb_formatRgb() {\n var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));\n return (a === 1 ? \"rgb(\" : \"rgba(\")\n + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + \", \"\n + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + \", \"\n + Math.max(0, Math.min(255, Math.round(this.b) || 0))\n + (a === 1 ? \")\" : \", \" + a + \")\");\n }\n\n function hex(value) {\n value = Math.max(0, Math.min(255, Math.round(value) || 0));\n return (value < 16 ? \"0\" : \"\") + value.toString(16);\n }\n\n function hsla(h, s, l, a) {\n if (a <= 0) h = s = l = NaN;\n else if (l <= 0 || l >= 1) h = s = NaN;\n else if (s <= 0) h = NaN;\n return new Hsl(h, s, l, a);\n }\n\n function hslConvert(o) {\n if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);\n if (!(o instanceof Color)) o = color(o);\n if (!o) return new Hsl;\n if (o instanceof Hsl) return o;\n o = o.rgb();\n var r = o.r / 255,\n g = o.g / 255,\n b = o.b / 255,\n min = Math.min(r, g, b),\n max = Math.max(r, g, b),\n h = NaN,\n s = max - min,\n l = (max + min) / 2;\n if (s) {\n if (r === max) h = (g - b) / s + (g < b) * 6;\n else if (g === max) h = (b - r) / s + 2;\n else h = (r - g) / s + 4;\n s /= l < 0.5 ? max + min : 2 - max - min;\n h *= 60;\n } else {\n s = l > 0 && l < 1 ? 0 : h;\n }\n return new Hsl(h, s, l, o.opacity);\n }\n\n function hsl(h, s, l, opacity) {\n return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);\n }\n\n function Hsl(h, s, l, opacity) {\n this.h = +h;\n this.s = +s;\n this.l = +l;\n this.opacity = +opacity;\n }\n\n define(Hsl, hsl, extend(Color, {\n brighter: function(k) {\n k = k == null ? brighter : Math.pow(brighter, k);\n return new Hsl(this.h, this.s, this.l * k, this.opacity);\n },\n darker: function(k) {\n k = k == null ? darker : Math.pow(darker, k);\n return new Hsl(this.h, this.s, this.l * k, this.opacity);\n },\n rgb: function() {\n var h = this.h % 360 + (this.h < 0) * 360,\n s = isNaN(h) || isNaN(this.s) ? 0 : this.s,\n l = this.l,\n m2 = l + (l < 0.5 ? l : 1 - l) * s,\n m1 = 2 * l - m2;\n return new Rgb(\n hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),\n hsl2rgb(h, m1, m2),\n hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),\n this.opacity\n );\n },\n displayable: function() {\n return (0 <= this.s && this.s <= 1 || isNaN(this.s))\n && (0 <= this.l && this.l <= 1)\n && (0 <= this.opacity && this.opacity <= 1);\n },\n formatHsl: function() {\n var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));\n return (a === 1 ? \"hsl(\" : \"hsla(\")\n + (this.h || 0) + \", \"\n + (this.s || 0) * 100 + \"%, \"\n + (this.l || 0) * 100 + \"%\"\n + (a === 1 ? \")\" : \", \" + a + \")\");\n }\n }));\n\n /* From FvD 13.37, CSS Color Module Level 3 */\n function hsl2rgb(h, m1, m2) {\n return (h < 60 ? m1 + (m2 - m1) * h / 60\n : h < 180 ? m2\n : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60\n : m1) * 255;\n }\n\n var deg2rad = Math.PI / 180;\n var rad2deg = 180 / Math.PI;\n\n // https://observablehq.com/@mbostock/lab-and-rgb\n var K = 18,\n Xn = 0.96422,\n Yn = 1,\n Zn = 0.82521,\n t0 = 4 / 29,\n t1 = 6 / 29,\n t2 = 3 * t1 * t1,\n t3 = t1 * t1 * t1;\n\n function labConvert(o) {\n if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);\n if (o instanceof Hcl) return hcl2lab(o);\n if (!(o instanceof Rgb)) o = rgbConvert(o);\n var r = rgb2lrgb(o.r),\n g = rgb2lrgb(o.g),\n b = rgb2lrgb(o.b),\n y = xyz2lab((0.2225045 * r + 0.7168786 * g + 0.0606169 * b) / Yn), x, z;\n if (r === g && g === b) x = z = y; else {\n x = xyz2lab((0.4360747 * r + 0.3850649 * g + 0.1430804 * b) / Xn);\n z = xyz2lab((0.0139322 * r + 0.0971045 * g + 0.7141733 * b) / Zn);\n }\n return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);\n }\n\n function lab(l, a, b, opacity) {\n return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);\n }\n\n function Lab(l, a, b, opacity) {\n this.l = +l;\n this.a = +a;\n this.b = +b;\n this.opacity = +opacity;\n }\n\n define(Lab, lab, extend(Color, {\n brighter: function(k) {\n return new Lab(this.l + K * (k == null ? 1 : k), this.a, this.b, this.opacity);\n },\n darker: function(k) {\n return new Lab(this.l - K * (k == null ? 1 : k), this.a, this.b, this.opacity);\n },\n rgb: function() {\n var y = (this.l + 16) / 116,\n x = isNaN(this.a) ? y : y + this.a / 500,\n z = isNaN(this.b) ? y : y - this.b / 200;\n x = Xn * lab2xyz(x);\n y = Yn * lab2xyz(y);\n z = Zn * lab2xyz(z);\n return new Rgb(\n lrgb2rgb( 3.1338561 * x - 1.6168667 * y - 0.4906146 * z),\n lrgb2rgb(-0.9787684 * x + 1.9161415 * y + 0.0334540 * z),\n lrgb2rgb( 0.0719453 * x - 0.2289914 * y + 1.4052427 * z),\n this.opacity\n );\n }\n }));\n\n function xyz2lab(t) {\n return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;\n }\n\n function lab2xyz(t) {\n return t > t1 ? t * t * t : t2 * (t - t0);\n }\n\n function lrgb2rgb(x) {\n return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);\n }\n\n function rgb2lrgb(x) {\n return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);\n }\n\n function hclConvert(o) {\n if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);\n if (!(o instanceof Lab)) o = labConvert(o);\n if (o.a === 0 && o.b === 0) return new Hcl(NaN, 0 < o.l && o.l < 100 ? 0 : NaN, o.l, o.opacity);\n var h = Math.atan2(o.b, o.a) * rad2deg;\n return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);\n }\n\n function hcl(h, c, l, opacity) {\n return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);\n }\n\n function Hcl(h, c, l, opacity) {\n this.h = +h;\n this.c = +c;\n this.l = +l;\n this.opacity = +opacity;\n }\n\n function hcl2lab(o) {\n if (isNaN(o.h)) return new Lab(o.l, 0, 0, o.opacity);\n var h = o.h * deg2rad;\n return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);\n }\n\n define(Hcl, hcl, extend(Color, {\n brighter: function(k) {\n return new Hcl(this.h, this.c, this.l + K * (k == null ? 1 : k), this.opacity);\n },\n darker: function(k) {\n return new Hcl(this.h, this.c, this.l - K * (k == null ? 1 : k), this.opacity);\n },\n rgb: function() {\n return hcl2lab(this).rgb();\n }\n }));\n\n var A = -0.14861,\n B = +1.78277,\n C = -0.29227,\n D = -0.90649,\n E = +1.97294,\n ED = E * D,\n EB = E * B,\n BC_DA = B * C - D * A;\n\n function cubehelixConvert(o) {\n if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);\n if (!(o instanceof Rgb)) o = rgbConvert(o);\n var r = o.r / 255,\n g = o.g / 255,\n b = o.b / 255,\n l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),\n bl = b - l,\n k = (E * (g - l) - C * bl) / D,\n s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1\n h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;\n return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);\n }\n\n function cubehelix(h, s, l, opacity) {\n return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);\n }\n\n function Cubehelix(h, s, l, opacity) {\n this.h = +h;\n this.s = +s;\n this.l = +l;\n this.opacity = +opacity;\n }\n\n define(Cubehelix, cubehelix, extend(Color, {\n brighter: function(k) {\n k = k == null ? brighter : Math.pow(brighter, k);\n return new Cubehelix(this.h, this.s, this.l * k, this.opacity);\n },\n darker: function(k) {\n k = k == null ? darker : Math.pow(darker, k);\n return new Cubehelix(this.h, this.s, this.l * k, this.opacity);\n },\n rgb: function() {\n var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,\n l = +this.l,\n a = isNaN(this.s) ? 0 : this.s * l * (1 - l),\n cosh = Math.cos(h),\n sinh = Math.sin(h);\n return new Rgb(\n 255 * (l + a * (A * cosh + B * sinh)),\n 255 * (l + a * (C * cosh + D * sinh)),\n 255 * (l + a * (E * cosh)),\n this.opacity\n );\n }\n }));\n\n function constant(x) {\n return function() {\n return x;\n };\n }\n\n function linear(a, d) {\n return function(t) {\n return a + t * d;\n };\n }\n\n function exponential(a, b, y) {\n return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {\n return Math.pow(a + t * b, y);\n };\n }\n\n function gamma(y) {\n return (y = +y) === 1 ? nogamma : function(a, b) {\n return b - a ? exponential(a, b, y) : constant(isNaN(a) ? b : a);\n };\n }\n\n function nogamma(a, b) {\n var d = b - a;\n return d ? linear(a, d) : constant(isNaN(a) ? b : a);\n }\n\n var rgb$1 = (function rgbGamma(y) {\n var color = gamma(y);\n\n function rgb$1(start, end) {\n var r = color((start = rgb(start)).r, (end = rgb(end)).r),\n g = color(start.g, end.g),\n b = color(start.b, end.b),\n opacity = nogamma(start.opacity, end.opacity);\n return function(t) {\n start.r = r(t);\n start.g = g(t);\n start.b = b(t);\n start.opacity = opacity(t);\n return start + \"\";\n };\n }\n\n rgb$1.gamma = rgbGamma;\n\n return rgb$1;\n })(1);\n\n function numberArray(a, b) {\n if (!b) b = [];\n var n = a ? Math.min(b.length, a.length) : 0,\n c = b.slice(),\n i;\n return function(t) {\n for (i = 0; i < n; ++i) c[i] = a[i] * (1 - t) + b[i] * t;\n return c;\n };\n }\n\n function isNumberArray(x) {\n return ArrayBuffer.isView(x) && !(x instanceof DataView);\n }\n\n function genericArray(a, b) {\n var nb = b ? b.length : 0,\n na = a ? Math.min(nb, a.length) : 0,\n x = new Array(na),\n c = new Array(nb),\n i;\n\n for (i = 0; i < na; ++i) x[i] = interpolate(a[i], b[i]);\n for (; i < nb; ++i) c[i] = b[i];\n\n return function(t) {\n for (i = 0; i < na; ++i) c[i] = x[i](t);\n return c;\n };\n }\n\n function date(a, b) {\n var d = new Date;\n return a = +a, b = +b, function(t) {\n return d.setTime(a * (1 - t) + b * t), d;\n };\n }\n\n function interpolateNumber(a, b) {\n return a = +a, b = +b, function(t) {\n return a * (1 - t) + b * t;\n };\n }\n\n function object(a, b) {\n var i = {},\n c = {},\n k;\n\n if (a === null || typeof a !== \"object\") a = {};\n if (b === null || typeof b !== \"object\") b = {};\n\n for (k in b) {\n if (k in a) {\n i[k] = interpolate(a[k], b[k]);\n } else {\n c[k] = b[k];\n }\n }\n\n return function(t) {\n for (k in i) c[k] = i[k](t);\n return c;\n };\n }\n\n var reA = /[-+]?(?:\\d+\\.?\\d*|\\.?\\d+)(?:[eE][-+]?\\d+)?/g,\n reB = new RegExp(reA.source, \"g\");\n\n function zero(b) {\n return function() {\n return b;\n };\n }\n\n function one(b) {\n return function(t) {\n return b(t) + \"\";\n };\n }\n\n function string(a, b) {\n var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b\n am, // current match in a\n bm, // current match in b\n bs, // string preceding current number in b, if any\n i = -1, // index in s\n s = [], // string constants and placeholders\n q = []; // number interpolators\n\n // Coerce inputs to strings.\n a = a + \"\", b = b + \"\";\n\n // Interpolate pairs of numbers in a & b.\n while ((am = reA.exec(a))\n && (bm = reB.exec(b))) {\n if ((bs = bm.index) > bi) { // a string precedes the next number in b\n bs = b.slice(bi, bs);\n if (s[i]) s[i] += bs; // coalesce with previous string\n else s[++i] = bs;\n }\n if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match\n if (s[i]) s[i] += bm; // coalesce with previous string\n else s[++i] = bm;\n } else { // interpolate non-matching numbers\n s[++i] = null;\n q.push({i: i, x: interpolateNumber(am, bm)});\n }\n bi = reB.lastIndex;\n }\n\n // Add remains of b.\n if (bi < b.length) {\n bs = b.slice(bi);\n if (s[i]) s[i] += bs; // coalesce with previous string\n else s[++i] = bs;\n }\n\n // Special optimization for only a single match.\n // Otherwise, interpolate each of the numbers and rejoin the string.\n return s.length < 2 ? (q[0]\n ? one(q[0].x)\n : zero(b))\n : (b = q.length, function(t) {\n for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);\n return s.join(\"\");\n });\n }\n\n function interpolate(a, b) {\n var t = typeof b, c;\n return b == null || t === \"boolean\" ? constant(b)\n : (t === \"number\" ? interpolateNumber\n : t === \"string\" ? ((c = color(b)) ? (b = c, rgb$1) : string)\n : b instanceof color ? rgb$1\n : b instanceof Date ? date\n : isNumberArray(b) ? numberArray\n : Array.isArray(b) ? genericArray\n : typeof b.valueOf !== \"function\" && typeof b.toString !== \"function\" || isNaN(b) ? object\n : interpolateNumber)(a, b);\n }\n\n function interpolateRound(a, b) {\n return a = +a, b = +b, function(t) {\n return Math.round(a * (1 - t) + b * t);\n };\n }\n\n function constant$1(x) {\n return function() {\n return x;\n };\n }\n\n function number(x) {\n return +x;\n }\n\n var unit = [0, 1];\n\n function identity(x) {\n return x;\n }\n\n function normalize(a, b) {\n return (b -= (a = +a))\n ? function(x) { return (x - a) / b; }\n : constant$1(isNaN(b) ? NaN : 0.5);\n }\n\n function clamper(a, b) {\n var t;\n if (a > b) t = a, a = b, b = t;\n return function(x) { return Math.max(a, Math.min(b, x)); };\n }\n\n // normalize(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].\n // interpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding range value x in [a,b].\n function bimap(domain, range, interpolate) {\n var d0 = domain[0], d1 = domain[1], r0 = range[0], r1 = range[1];\n if (d1 < d0) d0 = normalize(d1, d0), r0 = interpolate(r1, r0);\n else d0 = normalize(d0, d1), r0 = interpolate(r0, r1);\n return function(x) { return r0(d0(x)); };\n }\n\n function polymap(domain, range, interpolate) {\n var j = Math.min(domain.length, range.length) - 1,\n d = new Array(j),\n r = new Array(j),\n i = -1;\n\n // Reverse descending domains.\n if (domain[j] < domain[0]) {\n domain = domain.slice().reverse();\n range = range.slice().reverse();\n }\n\n while (++i < j) {\n d[i] = normalize(domain[i], domain[i + 1]);\n r[i] = interpolate(range[i], range[i + 1]);\n }\n\n return function(x) {\n var i = bisectRight(domain, x, 1, j) - 1;\n return r[i](d[i](x));\n };\n }\n\n function copy(source, target) {\n return target\n .domain(source.domain())\n .range(source.range())\n .interpolate(source.interpolate())\n .clamp(source.clamp())\n .unknown(source.unknown());\n }\n\n function transformer() {\n var domain = unit,\n range = unit,\n interpolate$1 = interpolate,\n transform,\n untransform,\n unknown,\n clamp = identity,\n piecewise,\n output,\n input;\n\n function rescale() {\n var n = Math.min(domain.length, range.length);\n if (clamp !== identity) clamp = clamper(domain[0], domain[n - 1]);\n piecewise = n > 2 ? polymap : bimap;\n output = input = null;\n return scale;\n }\n\n function scale(x) {\n return isNaN(x = +x) ? unknown : (output || (output = piecewise(domain.map(transform), range, interpolate$1)))(transform(clamp(x)));\n }\n\n scale.invert = function(y) {\n return clamp(untransform((input || (input = piecewise(range, domain.map(transform), interpolateNumber)))(y)));\n };\n\n scale.domain = function(_) {\n return arguments.length ? (domain = Array.from(_, number), rescale()) : domain.slice();\n };\n\n scale.range = function(_) {\n return arguments.length ? (range = Array.from(_), rescale()) : range.slice();\n };\n\n scale.rangeRound = function(_) {\n return range = Array.from(_), interpolate$1 = interpolateRound, rescale();\n };\n\n scale.clamp = function(_) {\n return arguments.length ? (clamp = _ ? true : identity, rescale()) : clamp !== identity;\n };\n\n scale.interpolate = function(_) {\n return arguments.length ? (interpolate$1 = _, rescale()) : interpolate$1;\n };\n\n scale.unknown = function(_) {\n return arguments.length ? (unknown = _, scale) : unknown;\n };\n\n return function(t, u) {\n transform = t, untransform = u;\n return rescale();\n };\n }\n\n function continuous() {\n return transformer()(identity, identity);\n }\n\n // Computes the decimal coefficient and exponent of the specified number x with\n // significant digits p, where x is positive and p is in [1, 21] or undefined.\n // For example, formatDecimal(1.23) returns [\"123\", 0].\n function formatDecimal(x, p) {\n if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf(\"e\")) < 0) return null; // NaN, ±Infinity\n var i, coefficient = x.slice(0, i);\n\n // The string returned by toExponential either has the form \\d\\.\\d+e[-+]\\d+\n // (e.g., 1.2e+3) or the form \\de[-+]\\d+ (e.g., 1e+3).\n return [\n coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,\n +x.slice(i + 1)\n ];\n }\n\n function exponent(x) {\n return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;\n }\n\n function formatGroup(grouping, thousands) {\n return function(value, width) {\n var i = value.length,\n t = [],\n j = 0,\n g = grouping[0],\n length = 0;\n\n while (i > 0 && g > 0) {\n if (length + g + 1 > width) g = Math.max(1, width - length);\n t.push(value.substring(i -= g, i + g));\n if ((length += g + 1) > width) break;\n g = grouping[j = (j + 1) % grouping.length];\n }\n\n return t.reverse().join(thousands);\n };\n }\n\n function formatNumerals(numerals) {\n return function(value) {\n return value.replace(/[0-9]/g, function(i) {\n return numerals[+i];\n });\n };\n }\n\n // [[fill]align][sign][symbol][0][width][,][.precision][~][type]\n var re = /^(?:(.)?([<>=^]))?([+\\-( ])?([$#])?(0)?(\\d+)?(,)?(\\.\\d+)?(~)?([a-z%])?$/i;\n\n function formatSpecifier(specifier) {\n if (!(match = re.exec(specifier))) throw new Error(\"invalid format: \" + specifier);\n var match;\n return new FormatSpecifier({\n fill: match[1],\n align: match[2],\n sign: match[3],\n symbol: match[4],\n zero: match[5],\n width: match[6],\n comma: match[7],\n precision: match[8] && match[8].slice(1),\n trim: match[9],\n type: match[10]\n });\n }\n\n formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof\n\n function FormatSpecifier(specifier) {\n this.fill = specifier.fill === undefined ? \" \" : specifier.fill + \"\";\n this.align = specifier.align === undefined ? \">\" : specifier.align + \"\";\n this.sign = specifier.sign === undefined ? \"-\" : specifier.sign + \"\";\n this.symbol = specifier.symbol === undefined ? \"\" : specifier.symbol + \"\";\n this.zero = !!specifier.zero;\n this.width = specifier.width === undefined ? undefined : +specifier.width;\n this.comma = !!specifier.comma;\n this.precision = specifier.precision === undefined ? undefined : +specifier.precision;\n this.trim = !!specifier.trim;\n this.type = specifier.type === undefined ? \"\" : specifier.type + \"\";\n }\n\n FormatSpecifier.prototype.toString = function() {\n return this.fill\n + this.align\n + this.sign\n + this.symbol\n + (this.zero ? \"0\" : \"\")\n + (this.width === undefined ? \"\" : Math.max(1, this.width | 0))\n + (this.comma ? \",\" : \"\")\n + (this.precision === undefined ? \"\" : \".\" + Math.max(0, this.precision | 0))\n + (this.trim ? \"~\" : \"\")\n + this.type;\n };\n\n // Trims insignificant zeros, e.g., replaces 1.2000k with 1.2k.\n function formatTrim(s) {\n out: for (var n = s.length, i = 1, i0 = -1, i1; i < n; ++i) {\n switch (s[i]) {\n case \".\": i0 = i1 = i; break;\n case \"0\": if (i0 === 0) i0 = i; i1 = i; break;\n default: if (!+s[i]) break out; if (i0 > 0) i0 = 0; break;\n }\n }\n return i0 > 0 ? s.slice(0, i0) + s.slice(i1 + 1) : s;\n }\n\n var prefixExponent;\n\n function formatPrefixAuto(x, p) {\n var d = formatDecimal(x, p);\n if (!d) return x + \"\";\n var coefficient = d[0],\n exponent = d[1],\n i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,\n n = coefficient.length;\n return i === n ? coefficient\n : i > n ? coefficient + new Array(i - n + 1).join(\"0\")\n : i > 0 ? coefficient.slice(0, i) + \".\" + coefficient.slice(i)\n : \"0.\" + new Array(1 - i).join(\"0\") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!\n }\n\n function formatRounded(x, p) {\n var d = formatDecimal(x, p);\n if (!d) return x + \"\";\n var coefficient = d[0],\n exponent = d[1];\n return exponent < 0 ? \"0.\" + new Array(-exponent).join(\"0\") + coefficient\n : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + \".\" + coefficient.slice(exponent + 1)\n : coefficient + new Array(exponent - coefficient.length + 2).join(\"0\");\n }\n\n var formatTypes = {\n \"%\": function(x, p) { return (x * 100).toFixed(p); },\n \"b\": function(x) { return Math.round(x).toString(2); },\n \"c\": function(x) { return x + \"\"; },\n \"d\": function(x) { return Math.round(x).toString(10); },\n \"e\": function(x, p) { return x.toExponential(p); },\n \"f\": function(x, p) { return x.toFixed(p); },\n \"g\": function(x, p) { return x.toPrecision(p); },\n \"o\": function(x) { return Math.round(x).toString(8); },\n \"p\": function(x, p) { return formatRounded(x * 100, p); },\n \"r\": formatRounded,\n \"s\": formatPrefixAuto,\n \"X\": function(x) { return Math.round(x).toString(16).toUpperCase(); },\n \"x\": function(x) { return Math.round(x).toString(16); }\n };\n\n function identity$1(x) {\n return x;\n }\n\n var map = Array.prototype.map,\n prefixes = [\"y\",\"z\",\"a\",\"f\",\"p\",\"n\",\"µ\",\"m\",\"\",\"k\",\"M\",\"G\",\"T\",\"P\",\"E\",\"Z\",\"Y\"];\n\n function formatLocale(locale) {\n var group = locale.grouping === undefined || locale.thousands === undefined ? identity$1 : formatGroup(map.call(locale.grouping, Number), locale.thousands + \"\"),\n currencyPrefix = locale.currency === undefined ? \"\" : locale.currency[0] + \"\",\n currencySuffix = locale.currency === undefined ? \"\" : locale.currency[1] + \"\",\n decimal = locale.decimal === undefined ? \".\" : locale.decimal + \"\",\n numerals = locale.numerals === undefined ? identity$1 : formatNumerals(map.call(locale.numerals, String)),\n percent = locale.percent === undefined ? \"%\" : locale.percent + \"\",\n minus = locale.minus === undefined ? \"-\" : locale.minus + \"\",\n nan = locale.nan === undefined ? \"NaN\" : locale.nan + \"\";\n\n function newFormat(specifier) {\n specifier = formatSpecifier(specifier);\n\n var fill = specifier.fill,\n align = specifier.align,\n sign = specifier.sign,\n symbol = specifier.symbol,\n zero = specifier.zero,\n width = specifier.width,\n comma = specifier.comma,\n precision = specifier.precision,\n trim = specifier.trim,\n type = specifier.type;\n\n // The \"n\" type is an alias for \",g\".\n if (type === \"n\") comma = true, type = \"g\";\n\n // The \"\" type, and any invalid type, is an alias for \".12~g\".\n else if (!formatTypes[type]) precision === undefined && (precision = 12), trim = true, type = \"g\";\n\n // If zero fill is specified, padding goes after sign and before digits.\n if (zero || (fill === \"0\" && align === \"=\")) zero = true, fill = \"0\", align = \"=\";\n\n // Compute the prefix and suffix.\n // For SI-prefix, the suffix is lazily computed.\n var prefix = symbol === \"$\" ? currencyPrefix : symbol === \"#\" && /[boxX]/.test(type) ? \"0\" + type.toLowerCase() : \"\",\n suffix = symbol === \"$\" ? currencySuffix : /[%p]/.test(type) ? percent : \"\";\n\n // What format function should we use?\n // Is this an integer type?\n // Can this type generate exponential notation?\n var formatType = formatTypes[type],\n maybeSuffix = /[defgprs%]/.test(type);\n\n // Set the default precision if not specified,\n // or clamp the specified precision to the supported range.\n // For significant precision, it must be in [1, 21].\n // For fixed precision, it must be in [0, 20].\n precision = precision === undefined ? 6\n : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision))\n : Math.max(0, Math.min(20, precision));\n\n function format(value) {\n var valuePrefix = prefix,\n valueSuffix = suffix,\n i, n, c;\n\n if (type === \"c\") {\n valueSuffix = formatType(value) + valueSuffix;\n value = \"\";\n } else {\n value = +value;\n\n // Determine the sign. -0 is not less than 0, but 1 / -0 is!\n var valueNegative = value < 0 || 1 / value < 0;\n\n // Perform the initial formatting.\n value = isNaN(value) ? nan : formatType(Math.abs(value), precision);\n\n // Trim insignificant zeros.\n if (trim) value = formatTrim(value);\n\n // If a negative value rounds to zero after formatting, and no explicit positive sign is requested, hide the sign.\n if (valueNegative && +value === 0 && sign !== \"+\") valueNegative = false;\n\n // Compute the prefix and suffix.\n valuePrefix = (valueNegative ? (sign === \"(\" ? sign : minus) : sign === \"-\" || sign === \"(\" ? \"\" : sign) + valuePrefix;\n valueSuffix = (type === \"s\" ? prefixes[8 + prefixExponent / 3] : \"\") + valueSuffix + (valueNegative && sign === \"(\" ? \")\" : \"\");\n\n // Break the formatted value into the integer “value” part that can be\n // grouped, and fractional or exponential “suffix” part that is not.\n if (maybeSuffix) {\n i = -1, n = value.length;\n while (++i < n) {\n if (c = value.charCodeAt(i), 48 > c || c > 57) {\n valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;\n value = value.slice(0, i);\n break;\n }\n }\n }\n }\n\n // If the fill character is not \"0\", grouping is applied before padding.\n if (comma && !zero) value = group(value, Infinity);\n\n // Compute the padding.\n var length = valuePrefix.length + value.length + valueSuffix.length,\n padding = length < width ? new Array(width - length + 1).join(fill) : \"\";\n\n // If the fill character is \"0\", grouping is applied after padding.\n if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = \"\";\n\n // Reconstruct the final output based on the desired alignment.\n switch (align) {\n case \"<\": value = valuePrefix + value + valueSuffix + padding; break;\n case \"=\": value = valuePrefix + padding + value + valueSuffix; break;\n case \"^\": value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length); break;\n default: value = padding + valuePrefix + value + valueSuffix; break;\n }\n\n return numerals(value);\n }\n\n format.toString = function() {\n return specifier + \"\";\n };\n\n return format;\n }\n\n function formatPrefix(specifier, value) {\n var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = \"f\", specifier)),\n e = Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3,\n k = Math.pow(10, -e),\n prefix = prefixes[8 + e / 3];\n return function(value) {\n return f(k * value) + prefix;\n };\n }\n\n return {\n format: newFormat,\n formatPrefix: formatPrefix\n };\n }\n\n var locale;\n var format;\n var formatPrefix;\n\n defaultLocale({\n decimal: \".\",\n thousands: \",\",\n grouping: [3],\n currency: [\"$\", \"\"],\n minus: \"-\"\n });\n\n function defaultLocale(definition) {\n locale = formatLocale(definition);\n format = locale.format;\n formatPrefix = locale.formatPrefix;\n return locale;\n }\n\n function precisionFixed(step) {\n return Math.max(0, -exponent(Math.abs(step)));\n }\n\n function precisionPrefix(step, value) {\n return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3 - exponent(Math.abs(step)));\n }\n\n function precisionRound(step, max) {\n step = Math.abs(step), max = Math.abs(max) - step;\n return Math.max(0, exponent(max) - exponent(step)) + 1;\n }\n\n function tickFormat(start, stop, count, specifier) {\n var step = tickStep(start, stop, count),\n precision;\n specifier = formatSpecifier(specifier == null ? \",f\" : specifier);\n switch (specifier.type) {\n case \"s\": {\n var value = Math.max(Math.abs(start), Math.abs(stop));\n if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;\n return formatPrefix(specifier, value);\n }\n case \"\":\n case \"e\":\n case \"g\":\n case \"p\":\n case \"r\": {\n if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === \"e\");\n break;\n }\n case \"f\":\n case \"%\": {\n if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === \"%\") * 2;\n break;\n }\n }\n return format(specifier);\n }\n\n function linearish(scale) {\n var domain = scale.domain;\n\n scale.ticks = function(count) {\n var d = domain();\n return ticks(d[0], d[d.length - 1], count == null ? 10 : count);\n };\n\n scale.tickFormat = function(count, specifier) {\n var d = domain();\n return tickFormat(d[0], d[d.length - 1], count == null ? 10 : count, specifier);\n };\n\n scale.nice = function(count) {\n if (count == null) count = 10;\n\n var d = domain(),\n i0 = 0,\n i1 = d.length - 1,\n start = d[i0],\n stop = d[i1],\n step;\n\n if (stop < start) {\n step = start, start = stop, stop = step;\n step = i0, i0 = i1, i1 = step;\n }\n\n step = tickIncrement(start, stop, count);\n\n if (step > 0) {\n start = Math.floor(start / step) * step;\n stop = Math.ceil(stop / step) * step;\n step = tickIncrement(start, stop, count);\n } else if (step < 0) {\n start = Math.ceil(start * step) / step;\n stop = Math.floor(stop * step) / step;\n step = tickIncrement(start, stop, count);\n }\n\n if (step > 0) {\n d[i0] = Math.floor(start / step) * step;\n d[i1] = Math.ceil(stop / step) * step;\n domain(d);\n } else if (step < 0) {\n d[i0] = Math.ceil(start * step) / step;\n d[i1] = Math.floor(stop * step) / step;\n domain(d);\n }\n\n return scale;\n };\n\n return scale;\n }\n\n function linear$1() {\n var scale = continuous();\n\n scale.copy = function() {\n return copy(scale, linear$1());\n };\n\n initRange.apply(scale, arguments);\n\n return linearish(scale);\n }\n\n var t0$1 = new Date,\n t1$1 = new Date;\n\n function newInterval(floori, offseti, count, field) {\n\n function interval(date) {\n return floori(date = arguments.length === 0 ? new Date : new Date(+date)), date;\n }\n\n interval.floor = function(date) {\n return floori(date = new Date(+date)), date;\n };\n\n interval.ceil = function(date) {\n return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;\n };\n\n interval.round = function(date) {\n var d0 = interval(date),\n d1 = interval.ceil(date);\n return date - d0 < d1 - date ? d0 : d1;\n };\n\n interval.offset = function(date, step) {\n return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;\n };\n\n interval.range = function(start, stop, step) {\n var range = [], previous;\n start = interval.ceil(start);\n step = step == null ? 1 : Math.floor(step);\n if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date\n do range.push(previous = new Date(+start)), offseti(start, step), floori(start);\n while (previous < start && start < stop);\n return range;\n };\n\n interval.filter = function(test) {\n return newInterval(function(date) {\n if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);\n }, function(date, step) {\n if (date >= date) {\n if (step < 0) while (++step <= 0) {\n while (offseti(date, -1), !test(date)) {} // eslint-disable-line no-empty\n } else while (--step >= 0) {\n while (offseti(date, +1), !test(date)) {} // eslint-disable-line no-empty\n }\n }\n });\n };\n\n if (count) {\n interval.count = function(start, end) {\n t0$1.setTime(+start), t1$1.setTime(+end);\n floori(t0$1), floori(t1$1);\n return Math.floor(count(t0$1, t1$1));\n };\n\n interval.every = function(step) {\n step = Math.floor(step);\n return !isFinite(step) || !(step > 0) ? null\n : !(step > 1) ? interval\n : interval.filter(field\n ? function(d) { return field(d) % step === 0; }\n : function(d) { return interval.count(0, d) % step === 0; });\n };\n }\n\n return interval;\n }\n\n var millisecond = newInterval(function() {\n // noop\n }, function(date, step) {\n date.setTime(+date + step);\n }, function(start, end) {\n return end - start;\n });\n\n // An optimized implementation for this simple case.\n millisecond.every = function(k) {\n k = Math.floor(k);\n if (!isFinite(k) || !(k > 0)) return null;\n if (!(k > 1)) return millisecond;\n return newInterval(function(date) {\n date.setTime(Math.floor(date / k) * k);\n }, function(date, step) {\n date.setTime(+date + step * k);\n }, function(start, end) {\n return (end - start) / k;\n });\n };\n\n var durationSecond = 1e3;\n var durationMinute = 6e4;\n var durationHour = 36e5;\n var durationDay = 864e5;\n var durationWeek = 6048e5;\n\n var second = newInterval(function(date) {\n date.setTime(date - date.getMilliseconds());\n }, function(date, step) {\n date.setTime(+date + step * durationSecond);\n }, function(start, end) {\n return (end - start) / durationSecond;\n }, function(date) {\n return date.getUTCSeconds();\n });\n\n var minute = newInterval(function(date) {\n date.setTime(date - date.getMilliseconds() - date.getSeconds() * durationSecond);\n }, function(date, step) {\n date.setTime(+date + step * durationMinute);\n }, function(start, end) {\n return (end - start) / durationMinute;\n }, function(date) {\n return date.getMinutes();\n });\n\n var hour = newInterval(function(date) {\n date.setTime(date - date.getMilliseconds() - date.getSeconds() * durationSecond - date.getMinutes() * durationMinute);\n }, function(date, step) {\n date.setTime(+date + step * durationHour);\n }, function(start, end) {\n return (end - start) / durationHour;\n }, function(date) {\n return date.getHours();\n });\n\n var day = newInterval(function(date) {\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setDate(date.getDate() + step);\n }, function(start, end) {\n return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationDay;\n }, function(date) {\n return date.getDate() - 1;\n });\n\n function weekday(i) {\n return newInterval(function(date) {\n date.setDate(date.getDate() - (date.getDay() + 7 - i) % 7);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setDate(date.getDate() + step * 7);\n }, function(start, end) {\n return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationWeek;\n });\n }\n\n var sunday = weekday(0);\n var monday = weekday(1);\n var tuesday = weekday(2);\n var wednesday = weekday(3);\n var thursday = weekday(4);\n var friday = weekday(5);\n var saturday = weekday(6);\n\n var month = newInterval(function(date) {\n date.setDate(1);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setMonth(date.getMonth() + step);\n }, function(start, end) {\n return end.getMonth() - start.getMonth() + (end.getFullYear() - start.getFullYear()) * 12;\n }, function(date) {\n return date.getMonth();\n });\n\n var year = newInterval(function(date) {\n date.setMonth(0, 1);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setFullYear(date.getFullYear() + step);\n }, function(start, end) {\n return end.getFullYear() - start.getFullYear();\n }, function(date) {\n return date.getFullYear();\n });\n\n // An optimized implementation for this simple case.\n year.every = function(k) {\n return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {\n date.setFullYear(Math.floor(date.getFullYear() / k) * k);\n date.setMonth(0, 1);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setFullYear(date.getFullYear() + step * k);\n });\n };\n\n var utcMinute = newInterval(function(date) {\n date.setUTCSeconds(0, 0);\n }, function(date, step) {\n date.setTime(+date + step * durationMinute);\n }, function(start, end) {\n return (end - start) / durationMinute;\n }, function(date) {\n return date.getUTCMinutes();\n });\n\n var utcHour = newInterval(function(date) {\n date.setUTCMinutes(0, 0, 0);\n }, function(date, step) {\n date.setTime(+date + step * durationHour);\n }, function(start, end) {\n return (end - start) / durationHour;\n }, function(date) {\n return date.getUTCHours();\n });\n\n var utcDay = newInterval(function(date) {\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCDate(date.getUTCDate() + step);\n }, function(start, end) {\n return (end - start) / durationDay;\n }, function(date) {\n return date.getUTCDate() - 1;\n });\n\n function utcWeekday(i) {\n return newInterval(function(date) {\n date.setUTCDate(date.getUTCDate() - (date.getUTCDay() + 7 - i) % 7);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCDate(date.getUTCDate() + step * 7);\n }, function(start, end) {\n return (end - start) / durationWeek;\n });\n }\n\n var utcSunday = utcWeekday(0);\n var utcMonday = utcWeekday(1);\n var utcTuesday = utcWeekday(2);\n var utcWednesday = utcWeekday(3);\n var utcThursday = utcWeekday(4);\n var utcFriday = utcWeekday(5);\n var utcSaturday = utcWeekday(6);\n\n var utcMonth = newInterval(function(date) {\n date.setUTCDate(1);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCMonth(date.getUTCMonth() + step);\n }, function(start, end) {\n return end.getUTCMonth() - start.getUTCMonth() + (end.getUTCFullYear() - start.getUTCFullYear()) * 12;\n }, function(date) {\n return date.getUTCMonth();\n });\n\n var utcYear = newInterval(function(date) {\n date.setUTCMonth(0, 1);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCFullYear(date.getUTCFullYear() + step);\n }, function(start, end) {\n return end.getUTCFullYear() - start.getUTCFullYear();\n }, function(date) {\n return date.getUTCFullYear();\n });\n\n // An optimized implementation for this simple case.\n utcYear.every = function(k) {\n return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {\n date.setUTCFullYear(Math.floor(date.getUTCFullYear() / k) * k);\n date.setUTCMonth(0, 1);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCFullYear(date.getUTCFullYear() + step * k);\n });\n };\n\n function localDate(d) {\n if (0 <= d.y && d.y < 100) {\n var date = new Date(-1, d.m, d.d, d.H, d.M, d.S, d.L);\n date.setFullYear(d.y);\n return date;\n }\n return new Date(d.y, d.m, d.d, d.H, d.M, d.S, d.L);\n }\n\n function utcDate(d) {\n if (0 <= d.y && d.y < 100) {\n var date = new Date(Date.UTC(-1, d.m, d.d, d.H, d.M, d.S, d.L));\n date.setUTCFullYear(d.y);\n return date;\n }\n return new Date(Date.UTC(d.y, d.m, d.d, d.H, d.M, d.S, d.L));\n }\n\n function newDate(y, m, d) {\n return {y: y, m: m, d: d, H: 0, M: 0, S: 0, L: 0};\n }\n\n function formatLocale$1(locale) {\n var locale_dateTime = locale.dateTime,\n locale_date = locale.date,\n locale_time = locale.time,\n locale_periods = locale.periods,\n locale_weekdays = locale.days,\n locale_shortWeekdays = locale.shortDays,\n locale_months = locale.months,\n locale_shortMonths = locale.shortMonths;\n\n var periodRe = formatRe(locale_periods),\n periodLookup = formatLookup(locale_periods),\n weekdayRe = formatRe(locale_weekdays),\n weekdayLookup = formatLookup(locale_weekdays),\n shortWeekdayRe = formatRe(locale_shortWeekdays),\n shortWeekdayLookup = formatLookup(locale_shortWeekdays),\n monthRe = formatRe(locale_months),\n monthLookup = formatLookup(locale_months),\n shortMonthRe = formatRe(locale_shortMonths),\n shortMonthLookup = formatLookup(locale_shortMonths);\n\n var formats = {\n \"a\": formatShortWeekday,\n \"A\": formatWeekday,\n \"b\": formatShortMonth,\n \"B\": formatMonth,\n \"c\": null,\n \"d\": formatDayOfMonth,\n \"e\": formatDayOfMonth,\n \"f\": formatMicroseconds,\n \"H\": formatHour24,\n \"I\": formatHour12,\n \"j\": formatDayOfYear,\n \"L\": formatMilliseconds,\n \"m\": formatMonthNumber,\n \"M\": formatMinutes,\n \"p\": formatPeriod,\n \"q\": formatQuarter,\n \"Q\": formatUnixTimestamp,\n \"s\": formatUnixTimestampSeconds,\n \"S\": formatSeconds,\n \"u\": formatWeekdayNumberMonday,\n \"U\": formatWeekNumberSunday,\n \"V\": formatWeekNumberISO,\n \"w\": formatWeekdayNumberSunday,\n \"W\": formatWeekNumberMonday,\n \"x\": null,\n \"X\": null,\n \"y\": formatYear,\n \"Y\": formatFullYear,\n \"Z\": formatZone,\n \"%\": formatLiteralPercent\n };\n\n var utcFormats = {\n \"a\": formatUTCShortWeekday,\n \"A\": formatUTCWeekday,\n \"b\": formatUTCShortMonth,\n \"B\": formatUTCMonth,\n \"c\": null,\n \"d\": formatUTCDayOfMonth,\n \"e\": formatUTCDayOfMonth,\n \"f\": formatUTCMicroseconds,\n \"H\": formatUTCHour24,\n \"I\": formatUTCHour12,\n \"j\": formatUTCDayOfYear,\n \"L\": formatUTCMilliseconds,\n \"m\": formatUTCMonthNumber,\n \"M\": formatUTCMinutes,\n \"p\": formatUTCPeriod,\n \"q\": formatUTCQuarter,\n \"Q\": formatUnixTimestamp,\n \"s\": formatUnixTimestampSeconds,\n \"S\": formatUTCSeconds,\n \"u\": formatUTCWeekdayNumberMonday,\n \"U\": formatUTCWeekNumberSunday,\n \"V\": formatUTCWeekNumberISO,\n \"w\": formatUTCWeekdayNumberSunday,\n \"W\": formatUTCWeekNumberMonday,\n \"x\": null,\n \"X\": null,\n \"y\": formatUTCYear,\n \"Y\": formatUTCFullYear,\n \"Z\": formatUTCZone,\n \"%\": formatLiteralPercent\n };\n\n var parses = {\n \"a\": parseShortWeekday,\n \"A\": parseWeekday,\n \"b\": parseShortMonth,\n \"B\": parseMonth,\n \"c\": parseLocaleDateTime,\n \"d\": parseDayOfMonth,\n \"e\": parseDayOfMonth,\n \"f\": parseMicroseconds,\n \"H\": parseHour24,\n \"I\": parseHour24,\n \"j\": parseDayOfYear,\n \"L\": parseMilliseconds,\n \"m\": parseMonthNumber,\n \"M\": parseMinutes,\n \"p\": parsePeriod,\n \"q\": parseQuarter,\n \"Q\": parseUnixTimestamp,\n \"s\": parseUnixTimestampSeconds,\n \"S\": parseSeconds,\n \"u\": parseWeekdayNumberMonday,\n \"U\": parseWeekNumberSunday,\n \"V\": parseWeekNumberISO,\n \"w\": parseWeekdayNumberSunday,\n \"W\": parseWeekNumberMonday,\n \"x\": parseLocaleDate,\n \"X\": parseLocaleTime,\n \"y\": parseYear,\n \"Y\": parseFullYear,\n \"Z\": parseZone,\n \"%\": parseLiteralPercent\n };\n\n // These recursive directive definitions must be deferred.\n formats.x = newFormat(locale_date, formats);\n formats.X = newFormat(locale_time, formats);\n formats.c = newFormat(locale_dateTime, formats);\n utcFormats.x = newFormat(locale_date, utcFormats);\n utcFormats.X = newFormat(locale_time, utcFormats);\n utcFormats.c = newFormat(locale_dateTime, utcFormats);\n\n function newFormat(specifier, formats) {\n return function(date) {\n var string = [],\n i = -1,\n j = 0,\n n = specifier.length,\n c,\n pad,\n format;\n\n if (!(date instanceof Date)) date = new Date(+date);\n\n while (++i < n) {\n if (specifier.charCodeAt(i) === 37) {\n string.push(specifier.slice(j, i));\n if ((pad = pads[c = specifier.charAt(++i)]) != null) c = specifier.charAt(++i);\n else pad = c === \"e\" ? \" \" : \"0\";\n if (format = formats[c]) c = format(date, pad);\n string.push(c);\n j = i + 1;\n }\n }\n\n string.push(specifier.slice(j, i));\n return string.join(\"\");\n };\n }\n\n function newParse(specifier, Z) {\n return function(string) {\n var d = newDate(1900, undefined, 1),\n i = parseSpecifier(d, specifier, string += \"\", 0),\n week, day$1;\n if (i != string.length) return null;\n\n // If a UNIX timestamp is specified, return it.\n if (\"Q\" in d) return new Date(d.Q);\n if (\"s\" in d) return new Date(d.s * 1000 + (\"L\" in d ? d.L : 0));\n\n // If this is utcParse, never use the local timezone.\n if (Z && !(\"Z\" in d)) d.Z = 0;\n\n // The am-pm flag is 0 for AM, and 1 for PM.\n if (\"p\" in d) d.H = d.H % 12 + d.p * 12;\n\n // If the month was not specified, inherit from the quarter.\n if (d.m === undefined) d.m = \"q\" in d ? d.q : 0;\n\n // Convert day-of-week and week-of-year to day-of-year.\n if (\"V\" in d) {\n if (d.V < 1 || d.V > 53) return null;\n if (!(\"w\" in d)) d.w = 1;\n if (\"Z\" in d) {\n week = utcDate(newDate(d.y, 0, 1)), day$1 = week.getUTCDay();\n week = day$1 > 4 || day$1 === 0 ? utcMonday.ceil(week) : utcMonday(week);\n week = utcDay.offset(week, (d.V - 1) * 7);\n d.y = week.getUTCFullYear();\n d.m = week.getUTCMonth();\n d.d = week.getUTCDate() + (d.w + 6) % 7;\n } else {\n week = localDate(newDate(d.y, 0, 1)), day$1 = week.getDay();\n week = day$1 > 4 || day$1 === 0 ? monday.ceil(week) : monday(week);\n week = day.offset(week, (d.V - 1) * 7);\n d.y = week.getFullYear();\n d.m = week.getMonth();\n d.d = week.getDate() + (d.w + 6) % 7;\n }\n } else if (\"W\" in d || \"U\" in d) {\n if (!(\"w\" in d)) d.w = \"u\" in d ? d.u % 7 : \"W\" in d ? 1 : 0;\n day$1 = \"Z\" in d ? utcDate(newDate(d.y, 0, 1)).getUTCDay() : localDate(newDate(d.y, 0, 1)).getDay();\n d.m = 0;\n d.d = \"W\" in d ? (d.w + 6) % 7 + d.W * 7 - (day$1 + 5) % 7 : d.w + d.U * 7 - (day$1 + 6) % 7;\n }\n\n // If a time zone is specified, all fields are interpreted as UTC and then\n // offset according to the specified time zone.\n if (\"Z\" in d) {\n d.H += d.Z / 100 | 0;\n d.M += d.Z % 100;\n return utcDate(d);\n }\n\n // Otherwise, all fields are in local time.\n return localDate(d);\n };\n }\n\n function parseSpecifier(d, specifier, string, j) {\n var i = 0,\n n = specifier.length,\n m = string.length,\n c,\n parse;\n\n while (i < n) {\n if (j >= m) return -1;\n c = specifier.charCodeAt(i++);\n if (c === 37) {\n c = specifier.charAt(i++);\n parse = parses[c in pads ? specifier.charAt(i++) : c];\n if (!parse || ((j = parse(d, string, j)) < 0)) return -1;\n } else if (c != string.charCodeAt(j++)) {\n return -1;\n }\n }\n\n return j;\n }\n\n function parsePeriod(d, string, i) {\n var n = periodRe.exec(string.slice(i));\n return n ? (d.p = periodLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseShortWeekday(d, string, i) {\n var n = shortWeekdayRe.exec(string.slice(i));\n return n ? (d.w = shortWeekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseWeekday(d, string, i) {\n var n = weekdayRe.exec(string.slice(i));\n return n ? (d.w = weekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseShortMonth(d, string, i) {\n var n = shortMonthRe.exec(string.slice(i));\n return n ? (d.m = shortMonthLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseMonth(d, string, i) {\n var n = monthRe.exec(string.slice(i));\n return n ? (d.m = monthLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseLocaleDateTime(d, string, i) {\n return parseSpecifier(d, locale_dateTime, string, i);\n }\n\n function parseLocaleDate(d, string, i) {\n return parseSpecifier(d, locale_date, string, i);\n }\n\n function parseLocaleTime(d, string, i) {\n return parseSpecifier(d, locale_time, string, i);\n }\n\n function formatShortWeekday(d) {\n return locale_shortWeekdays[d.getDay()];\n }\n\n function formatWeekday(d) {\n return locale_weekdays[d.getDay()];\n }\n\n function formatShortMonth(d) {\n return locale_shortMonths[d.getMonth()];\n }\n\n function formatMonth(d) {\n return locale_months[d.getMonth()];\n }\n\n function formatPeriod(d) {\n return locale_periods[+(d.getHours() >= 12)];\n }\n\n function formatQuarter(d) {\n return 1 + ~~(d.getMonth() / 3);\n }\n\n function formatUTCShortWeekday(d) {\n return locale_shortWeekdays[d.getUTCDay()];\n }\n\n function formatUTCWeekday(d) {\n return locale_weekdays[d.getUTCDay()];\n }\n\n function formatUTCShortMonth(d) {\n return locale_shortMonths[d.getUTCMonth()];\n }\n\n function formatUTCMonth(d) {\n return locale_months[d.getUTCMonth()];\n }\n\n function formatUTCPeriod(d) {\n return locale_periods[+(d.getUTCHours() >= 12)];\n }\n\n function formatUTCQuarter(d) {\n return 1 + ~~(d.getUTCMonth() / 3);\n }\n\n return {\n format: function(specifier) {\n var f = newFormat(specifier += \"\", formats);\n f.toString = function() { return specifier; };\n return f;\n },\n parse: function(specifier) {\n var p = newParse(specifier += \"\", false);\n p.toString = function() { return specifier; };\n return p;\n },\n utcFormat: function(specifier) {\n var f = newFormat(specifier += \"\", utcFormats);\n f.toString = function() { return specifier; };\n return f;\n },\n utcParse: function(specifier) {\n var p = newParse(specifier += \"\", true);\n p.toString = function() { return specifier; };\n return p;\n }\n };\n }\n\n var pads = {\"-\": \"\", \"_\": \" \", \"0\": \"0\"},\n numberRe = /^\\s*\\d+/, // note: ignores next directive\n percentRe = /^%/,\n requoteRe = /[\\\\^$*+?|[\\]().{}]/g;\n\n function pad(value, fill, width) {\n var sign = value < 0 ? \"-\" : \"\",\n string = (sign ? -value : value) + \"\",\n length = string.length;\n return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);\n }\n\n function requote(s) {\n return s.replace(requoteRe, \"\\\\$&\");\n }\n\n function formatRe(names) {\n return new RegExp(\"^(?:\" + names.map(requote).join(\"|\") + \")\", \"i\");\n }\n\n function formatLookup(names) {\n var map = {}, i = -1, n = names.length;\n while (++i < n) map[names[i].toLowerCase()] = i;\n return map;\n }\n\n function parseWeekdayNumberSunday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 1));\n return n ? (d.w = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekdayNumberMonday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 1));\n return n ? (d.u = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekNumberSunday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.U = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekNumberISO(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.V = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekNumberMonday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.W = +n[0], i + n[0].length) : -1;\n }\n\n function parseFullYear(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 4));\n return n ? (d.y = +n[0], i + n[0].length) : -1;\n }\n\n function parseYear(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.y = +n[0] + (+n[0] > 68 ? 1900 : 2000), i + n[0].length) : -1;\n }\n\n function parseZone(d, string, i) {\n var n = /^(Z)|([+-]\\d\\d)(?::?(\\d\\d))?/.exec(string.slice(i, i + 6));\n return n ? (d.Z = n[1] ? 0 : -(n[2] + (n[3] || \"00\")), i + n[0].length) : -1;\n }\n\n function parseQuarter(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 1));\n return n ? (d.q = n[0] * 3 - 3, i + n[0].length) : -1;\n }\n\n function parseMonthNumber(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.m = n[0] - 1, i + n[0].length) : -1;\n }\n\n function parseDayOfMonth(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.d = +n[0], i + n[0].length) : -1;\n }\n\n function parseDayOfYear(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 3));\n return n ? (d.m = 0, d.d = +n[0], i + n[0].length) : -1;\n }\n\n function parseHour24(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.H = +n[0], i + n[0].length) : -1;\n }\n\n function parseMinutes(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.M = +n[0], i + n[0].length) : -1;\n }\n\n function parseSeconds(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.S = +n[0], i + n[0].length) : -1;\n }\n\n function parseMilliseconds(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 3));\n return n ? (d.L = +n[0], i + n[0].length) : -1;\n }\n\n function parseMicroseconds(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 6));\n return n ? (d.L = Math.floor(n[0] / 1000), i + n[0].length) : -1;\n }\n\n function parseLiteralPercent(d, string, i) {\n var n = percentRe.exec(string.slice(i, i + 1));\n return n ? i + n[0].length : -1;\n }\n\n function parseUnixTimestamp(d, string, i) {\n var n = numberRe.exec(string.slice(i));\n return n ? (d.Q = +n[0], i + n[0].length) : -1;\n }\n\n function parseUnixTimestampSeconds(d, string, i) {\n var n = numberRe.exec(string.slice(i));\n return n ? (d.s = +n[0], i + n[0].length) : -1;\n }\n\n function formatDayOfMonth(d, p) {\n return pad(d.getDate(), p, 2);\n }\n\n function formatHour24(d, p) {\n return pad(d.getHours(), p, 2);\n }\n\n function formatHour12(d, p) {\n return pad(d.getHours() % 12 || 12, p, 2);\n }\n\n function formatDayOfYear(d, p) {\n return pad(1 + day.count(year(d), d), p, 3);\n }\n\n function formatMilliseconds(d, p) {\n return pad(d.getMilliseconds(), p, 3);\n }\n\n function formatMicroseconds(d, p) {\n return formatMilliseconds(d, p) + \"000\";\n }\n\n function formatMonthNumber(d, p) {\n return pad(d.getMonth() + 1, p, 2);\n }\n\n function formatMinutes(d, p) {\n return pad(d.getMinutes(), p, 2);\n }\n\n function formatSeconds(d, p) {\n return pad(d.getSeconds(), p, 2);\n }\n\n function formatWeekdayNumberMonday(d) {\n var day = d.getDay();\n return day === 0 ? 7 : day;\n }\n\n function formatWeekNumberSunday(d, p) {\n return pad(sunday.count(year(d) - 1, d), p, 2);\n }\n\n function formatWeekNumberISO(d, p) {\n var day = d.getDay();\n d = (day >= 4 || day === 0) ? thursday(d) : thursday.ceil(d);\n return pad(thursday.count(year(d), d) + (year(d).getDay() === 4), p, 2);\n }\n\n function formatWeekdayNumberSunday(d) {\n return d.getDay();\n }\n\n function formatWeekNumberMonday(d, p) {\n return pad(monday.count(year(d) - 1, d), p, 2);\n }\n\n function formatYear(d, p) {\n return pad(d.getFullYear() % 100, p, 2);\n }\n\n function formatFullYear(d, p) {\n return pad(d.getFullYear() % 10000, p, 4);\n }\n\n function formatZone(d) {\n var z = d.getTimezoneOffset();\n return (z > 0 ? \"-\" : (z *= -1, \"+\"))\n + pad(z / 60 | 0, \"0\", 2)\n + pad(z % 60, \"0\", 2);\n }\n\n function formatUTCDayOfMonth(d, p) {\n return pad(d.getUTCDate(), p, 2);\n }\n\n function formatUTCHour24(d, p) {\n return pad(d.getUTCHours(), p, 2);\n }\n\n function formatUTCHour12(d, p) {\n return pad(d.getUTCHours() % 12 || 12, p, 2);\n }\n\n function formatUTCDayOfYear(d, p) {\n return pad(1 + utcDay.count(utcYear(d), d), p, 3);\n }\n\n function formatUTCMilliseconds(d, p) {\n return pad(d.getUTCMilliseconds(), p, 3);\n }\n\n function formatUTCMicroseconds(d, p) {\n return formatUTCMilliseconds(d, p) + \"000\";\n }\n\n function formatUTCMonthNumber(d, p) {\n return pad(d.getUTCMonth() + 1, p, 2);\n }\n\n function formatUTCMinutes(d, p) {\n return pad(d.getUTCMinutes(), p, 2);\n }\n\n function formatUTCSeconds(d, p) {\n return pad(d.getUTCSeconds(), p, 2);\n }\n\n function formatUTCWeekdayNumberMonday(d) {\n var dow = d.getUTCDay();\n return dow === 0 ? 7 : dow;\n }\n\n function formatUTCWeekNumberSunday(d, p) {\n return pad(utcSunday.count(utcYear(d) - 1, d), p, 2);\n }\n\n function formatUTCWeekNumberISO(d, p) {\n var day = d.getUTCDay();\n d = (day >= 4 || day === 0) ? utcThursday(d) : utcThursday.ceil(d);\n return pad(utcThursday.count(utcYear(d), d) + (utcYear(d).getUTCDay() === 4), p, 2);\n }\n\n function formatUTCWeekdayNumberSunday(d) {\n return d.getUTCDay();\n }\n\n function formatUTCWeekNumberMonday(d, p) {\n return pad(utcMonday.count(utcYear(d) - 1, d), p, 2);\n }\n\n function formatUTCYear(d, p) {\n return pad(d.getUTCFullYear() % 100, p, 2);\n }\n\n function formatUTCFullYear(d, p) {\n return pad(d.getUTCFullYear() % 10000, p, 4);\n }\n\n function formatUTCZone() {\n return \"+0000\";\n }\n\n function formatLiteralPercent() {\n return \"%\";\n }\n\n function formatUnixTimestamp(d) {\n return +d;\n }\n\n function formatUnixTimestampSeconds(d) {\n return Math.floor(+d / 1000);\n }\n\n var locale$1;\n var timeFormat;\n var timeParse;\n var utcFormat;\n var utcParse;\n\n defaultLocale$1({\n dateTime: \"%x, %X\",\n date: \"%-m/%-d/%Y\",\n time: \"%-I:%M:%S %p\",\n periods: [\"AM\", \"PM\"],\n days: [\"Sunday\", \"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\"],\n shortDays: [\"Sun\", \"Mon\", \"Tue\", \"Wed\", \"Thu\", \"Fri\", \"Sat\"],\n months: [\"January\", \"February\", \"March\", \"April\", \"May\", \"June\", \"July\", \"August\", \"September\", \"October\", \"November\", \"December\"],\n shortMonths: [\"Jan\", \"Feb\", \"Mar\", \"Apr\", \"May\", \"Jun\", \"Jul\", \"Aug\", \"Sep\", \"Oct\", \"Nov\", \"Dec\"]\n });\n\n function defaultLocale$1(definition) {\n locale$1 = formatLocale$1(definition);\n timeFormat = locale$1.format;\n timeParse = locale$1.parse;\n utcFormat = locale$1.utcFormat;\n utcParse = locale$1.utcParse;\n return locale$1;\n }\n\n var isoSpecifier = \"%Y-%m-%dT%H:%M:%S.%LZ\";\n\n function formatIsoNative(date) {\n return date.toISOString();\n }\n\n var formatIso = Date.prototype.toISOString\n ? formatIsoNative\n : utcFormat(isoSpecifier);\n\n function parseIsoNative(string) {\n var date = new Date(string);\n return isNaN(date) ? null : date;\n }\n\n var parseIso = +new Date(\"2000-01-01T00:00:00.000Z\")\n ? parseIsoNative\n : utcParse(isoSpecifier);\n\n var noop = {value: function() {}};\n\n function dispatch() {\n for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {\n if (!(t = arguments[i] + \"\") || (t in _) || /[\\s.]/.test(t)) throw new Error(\"illegal type: \" + t);\n _[t] = [];\n }\n return new Dispatch(_);\n }\n\n function Dispatch(_) {\n this._ = _;\n }\n\n function parseTypenames(typenames, types) {\n return typenames.trim().split(/^|\\s+/).map(function(t) {\n var name = \"\", i = t.indexOf(\".\");\n if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);\n if (t && !types.hasOwnProperty(t)) throw new Error(\"unknown type: \" + t);\n return {type: t, name: name};\n });\n }\n\n Dispatch.prototype = dispatch.prototype = {\n constructor: Dispatch,\n on: function(typename, callback) {\n var _ = this._,\n T = parseTypenames(typename + \"\", _),\n t,\n i = -1,\n n = T.length;\n\n // If no callback was specified, return the callback of the given type and name.\n if (arguments.length < 2) {\n while (++i < n) if ((t = (typename = T[i]).type) && (t = get(_[t], typename.name))) return t;\n return;\n }\n\n // If a type was specified, set the callback for the given type and name.\n // Otherwise, if a null callback was specified, remove callbacks of the given name.\n if (callback != null && typeof callback !== \"function\") throw new Error(\"invalid callback: \" + callback);\n while (++i < n) {\n if (t = (typename = T[i]).type) _[t] = set(_[t], typename.name, callback);\n else if (callback == null) for (t in _) _[t] = set(_[t], typename.name, null);\n }\n\n return this;\n },\n copy: function() {\n var copy = {}, _ = this._;\n for (var t in _) copy[t] = _[t].slice();\n return new Dispatch(copy);\n },\n call: function(type, that) {\n if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];\n if (!this._.hasOwnProperty(type)) throw new Error(\"unknown type: \" + type);\n for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);\n },\n apply: function(type, that, args) {\n if (!this._.hasOwnProperty(type)) throw new Error(\"unknown type: \" + type);\n for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);\n }\n };\n\n function get(type, name) {\n for (var i = 0, n = type.length, c; i < n; ++i) {\n if ((c = type[i]).name === name) {\n return c.value;\n }\n }\n }\n\n function set(type, name, callback) {\n for (var i = 0, n = type.length; i < n; ++i) {\n if (type[i].name === name) {\n type[i] = noop, type = type.slice(0, i).concat(type.slice(i + 1));\n break;\n }\n }\n if (callback != null) type.push({name: name, value: callback});\n return type;\n }\n\n var xhtml = \"http://www.w3.org/1999/xhtml\";\n\n var namespaces = {\n svg: \"http://www.w3.org/2000/svg\",\n xhtml: xhtml,\n xlink: \"http://www.w3.org/1999/xlink\",\n xml: \"http://www.w3.org/XML/1998/namespace\",\n xmlns: \"http://www.w3.org/2000/xmlns/\"\n };\n\n function namespace(name) {\n var prefix = name += \"\", i = prefix.indexOf(\":\");\n if (i >= 0 && (prefix = name.slice(0, i)) !== \"xmlns\") name = name.slice(i + 1);\n return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;\n }\n\n function creatorInherit(name) {\n return function() {\n var document = this.ownerDocument,\n uri = this.namespaceURI;\n return uri === xhtml && document.documentElement.namespaceURI === xhtml\n ? document.createElement(name)\n : document.createElementNS(uri, name);\n };\n }\n\n function creatorFixed(fullname) {\n return function() {\n return this.ownerDocument.createElementNS(fullname.space, fullname.local);\n };\n }\n\n function creator(name) {\n var fullname = namespace(name);\n return (fullname.local\n ? creatorFixed\n : creatorInherit)(fullname);\n }\n\n function none() {}\n\n function selector(selector) {\n return selector == null ? none : function() {\n return this.querySelector(selector);\n };\n }\n\n function selection_select(select) {\n if (typeof select !== \"function\") select = selector(select);\n\n for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {\n if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {\n if (\"__data__\" in node) subnode.__data__ = node.__data__;\n subgroup[i] = subnode;\n }\n }\n }\n\n return new Selection(subgroups, this._parents);\n }\n\n function empty() {\n return [];\n }\n\n function selectorAll(selector) {\n return selector == null ? empty : function() {\n return this.querySelectorAll(selector);\n };\n }\n\n function selection_selectAll(select) {\n if (typeof select !== \"function\") select = selectorAll(select);\n\n for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {\n if (node = group[i]) {\n subgroups.push(select.call(node, node.__data__, i, group));\n parents.push(node);\n }\n }\n }\n\n return new Selection(subgroups, parents);\n }\n\n function matcher(selector) {\n return function() {\n return this.matches(selector);\n };\n }\n\n function selection_filter(match) {\n if (typeof match !== \"function\") match = matcher(match);\n\n for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {\n if ((node = group[i]) && match.call(node, node.__data__, i, group)) {\n subgroup.push(node);\n }\n }\n }\n\n return new Selection(subgroups, this._parents);\n }\n\n function sparse(update) {\n return new Array(update.length);\n }\n\n function selection_enter() {\n return new Selection(this._enter || this._groups.map(sparse), this._parents);\n }\n\n function EnterNode(parent, datum) {\n this.ownerDocument = parent.ownerDocument;\n this.namespaceURI = parent.namespaceURI;\n this._next = null;\n this._parent = parent;\n this.__data__ = datum;\n }\n\n EnterNode.prototype = {\n constructor: EnterNode,\n appendChild: function(child) { return this._parent.insertBefore(child, this._next); },\n insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },\n querySelector: function(selector) { return this._parent.querySelector(selector); },\n querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }\n };\n\n function constant$2(x) {\n return function() {\n return x;\n };\n }\n\n var keyPrefix = \"$\"; // Protect against keys like “__proto__”.\n\n function bindIndex(parent, group, enter, update, exit, data) {\n var i = 0,\n node,\n groupLength = group.length,\n dataLength = data.length;\n\n // Put any non-null nodes that fit into update.\n // Put any null nodes into enter.\n // Put any remaining data into enter.\n for (; i < dataLength; ++i) {\n if (node = group[i]) {\n node.__data__ = data[i];\n update[i] = node;\n } else {\n enter[i] = new EnterNode(parent, data[i]);\n }\n }\n\n // Put any non-null nodes that don’t fit into exit.\n for (; i < groupLength; ++i) {\n if (node = group[i]) {\n exit[i] = node;\n }\n }\n }\n\n function bindKey(parent, group, enter, update, exit, data, key) {\n var i,\n node,\n nodeByKeyValue = {},\n groupLength = group.length,\n dataLength = data.length,\n keyValues = new Array(groupLength),\n keyValue;\n\n // Compute the key for each node.\n // If multiple nodes have the same key, the duplicates are added to exit.\n for (i = 0; i < groupLength; ++i) {\n if (node = group[i]) {\n keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);\n if (keyValue in nodeByKeyValue) {\n exit[i] = node;\n } else {\n nodeByKeyValue[keyValue] = node;\n }\n }\n }\n\n // Compute the key for each datum.\n // If there a node associated with this key, join and add it to update.\n // If there is not (or the key is a duplicate), add it to enter.\n for (i = 0; i < dataLength; ++i) {\n keyValue = keyPrefix + key.call(parent, data[i], i, data);\n if (node = nodeByKeyValue[keyValue]) {\n update[i] = node;\n node.__data__ = data[i];\n nodeByKeyValue[keyValue] = null;\n } else {\n enter[i] = new EnterNode(parent, data[i]);\n }\n }\n\n // Add any remaining nodes that were not bound to data to exit.\n for (i = 0; i < groupLength; ++i) {\n if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {\n exit[i] = node;\n }\n }\n }\n\n function selection_data(value, key) {\n if (!value) {\n data = new Array(this.size()), j = -1;\n this.each(function(d) { data[++j] = d; });\n return data;\n }\n\n var bind = key ? bindKey : bindIndex,\n parents = this._parents,\n groups = this._groups;\n\n if (typeof value !== \"function\") value = constant$2(value);\n\n for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {\n var parent = parents[j],\n group = groups[j],\n groupLength = group.length,\n data = value.call(parent, parent && parent.__data__, j, parents),\n dataLength = data.length,\n enterGroup = enter[j] = new Array(dataLength),\n updateGroup = update[j] = new Array(dataLength),\n exitGroup = exit[j] = new Array(groupLength);\n\n bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);\n\n // Now connect the enter nodes to their following update node, such that\n // appendChild can insert the materialized enter node before this node,\n // rather than at the end of the parent node.\n for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {\n if (previous = enterGroup[i0]) {\n if (i0 >= i1) i1 = i0 + 1;\n while (!(next = updateGroup[i1]) && ++i1 < dataLength);\n previous._next = next || null;\n }\n }\n }\n\n update = new Selection(update, parents);\n update._enter = enter;\n update._exit = exit;\n return update;\n }\n\n function selection_exit() {\n return new Selection(this._exit || this._groups.map(sparse), this._parents);\n }\n\n function selection_join(onenter, onupdate, onexit) {\n var enter = this.enter(), update = this, exit = this.exit();\n enter = typeof onenter === \"function\" ? onenter(enter) : enter.append(onenter + \"\");\n if (onupdate != null) update = onupdate(update);\n if (onexit == null) exit.remove(); else onexit(exit);\n return enter && update ? enter.merge(update).order() : update;\n }\n\n function selection_merge(selection) {\n\n for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {\n for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {\n if (node = group0[i] || group1[i]) {\n merge[i] = node;\n }\n }\n }\n\n for (; j < m0; ++j) {\n merges[j] = groups0[j];\n }\n\n return new Selection(merges, this._parents);\n }\n\n function selection_order() {\n\n for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {\n for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {\n if (node = group[i]) {\n if (next && node.compareDocumentPosition(next) ^ 4) next.parentNode.insertBefore(node, next);\n next = node;\n }\n }\n }\n\n return this;\n }\n\n function selection_sort(compare) {\n if (!compare) compare = ascending$1;\n\n function compareNode(a, b) {\n return a && b ? compare(a.__data__, b.__data__) : !a - !b;\n }\n\n for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {\n if (node = group[i]) {\n sortgroup[i] = node;\n }\n }\n sortgroup.sort(compareNode);\n }\n\n return new Selection(sortgroups, this._parents).order();\n }\n\n function ascending$1(a, b) {\n return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;\n }\n\n function selection_call() {\n var callback = arguments[0];\n arguments[0] = this;\n callback.apply(null, arguments);\n return this;\n }\n\n function selection_nodes() {\n var nodes = new Array(this.size()), i = -1;\n this.each(function() { nodes[++i] = this; });\n return nodes;\n }\n\n function selection_node() {\n\n for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {\n for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {\n var node = group[i];\n if (node) return node;\n }\n }\n\n return null;\n }\n\n function selection_size() {\n var size = 0;\n this.each(function() { ++size; });\n return size;\n }\n\n function selection_empty() {\n return !this.node();\n }\n\n function selection_each(callback) {\n\n for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {\n for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {\n if (node = group[i]) callback.call(node, node.__data__, i, group);\n }\n }\n\n return this;\n }\n\n function attrRemove(name) {\n return function() {\n this.removeAttribute(name);\n };\n }\n\n function attrRemoveNS(fullname) {\n return function() {\n this.removeAttributeNS(fullname.space, fullname.local);\n };\n }\n\n function attrConstant(name, value) {\n return function() {\n this.setAttribute(name, value);\n };\n }\n\n function attrConstantNS(fullname, value) {\n return function() {\n this.setAttributeNS(fullname.space, fullname.local, value);\n };\n }\n\n function attrFunction(name, value) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) this.removeAttribute(name);\n else this.setAttribute(name, v);\n };\n }\n\n function attrFunctionNS(fullname, value) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) this.removeAttributeNS(fullname.space, fullname.local);\n else this.setAttributeNS(fullname.space, fullname.local, v);\n };\n }\n\n function selection_attr(name, value) {\n var fullname = namespace(name);\n\n if (arguments.length < 2) {\n var node = this.node();\n return fullname.local\n ? node.getAttributeNS(fullname.space, fullname.local)\n : node.getAttribute(fullname);\n }\n\n return this.each((value == null\n ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === \"function\"\n ? (fullname.local ? attrFunctionNS : attrFunction)\n : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));\n }\n\n function defaultView(node) {\n return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node\n || (node.document && node) // node is a Window\n || node.defaultView; // node is a Document\n }\n\n function styleRemove(name) {\n return function() {\n this.style.removeProperty(name);\n };\n }\n\n function styleConstant(name, value, priority) {\n return function() {\n this.style.setProperty(name, value, priority);\n };\n }\n\n function styleFunction(name, value, priority) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) this.style.removeProperty(name);\n else this.style.setProperty(name, v, priority);\n };\n }\n\n function selection_style(name, value, priority) {\n return arguments.length > 1\n ? this.each((value == null\n ? styleRemove : typeof value === \"function\"\n ? styleFunction\n : styleConstant)(name, value, priority == null ? \"\" : priority))\n : styleValue(this.node(), name);\n }\n\n function styleValue(node, name) {\n return node.style.getPropertyValue(name)\n || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);\n }\n\n function propertyRemove(name) {\n return function() {\n delete this[name];\n };\n }\n\n function propertyConstant(name, value) {\n return function() {\n this[name] = value;\n };\n }\n\n function propertyFunction(name, value) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) delete this[name];\n else this[name] = v;\n };\n }\n\n function selection_property(name, value) {\n return arguments.length > 1\n ? this.each((value == null\n ? propertyRemove : typeof value === \"function\"\n ? propertyFunction\n : propertyConstant)(name, value))\n : this.node()[name];\n }\n\n function classArray(string) {\n return string.trim().split(/^|\\s+/);\n }\n\n function classList(node) {\n return node.classList || new ClassList(node);\n }\n\n function ClassList(node) {\n this._node = node;\n this._names = classArray(node.getAttribute(\"class\") || \"\");\n }\n\n ClassList.prototype = {\n add: function(name) {\n var i = this._names.indexOf(name);\n if (i < 0) {\n this._names.push(name);\n this._node.setAttribute(\"class\", this._names.join(\" \"));\n }\n },\n remove: function(name) {\n var i = this._names.indexOf(name);\n if (i >= 0) {\n this._names.splice(i, 1);\n this._node.setAttribute(\"class\", this._names.join(\" \"));\n }\n },\n contains: function(name) {\n return this._names.indexOf(name) >= 0;\n }\n };\n\n function classedAdd(node, names) {\n var list = classList(node), i = -1, n = names.length;\n while (++i < n) list.add(names[i]);\n }\n\n function classedRemove(node, names) {\n var list = classList(node), i = -1, n = names.length;\n while (++i < n) list.remove(names[i]);\n }\n\n function classedTrue(names) {\n return function() {\n classedAdd(this, names);\n };\n }\n\n function classedFalse(names) {\n return function() {\n classedRemove(this, names);\n };\n }\n\n function classedFunction(names, value) {\n return function() {\n (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);\n };\n }\n\n function selection_classed(name, value) {\n var names = classArray(name + \"\");\n\n if (arguments.length < 2) {\n var list = classList(this.node()), i = -1, n = names.length;\n while (++i < n) if (!list.contains(names[i])) return false;\n return true;\n }\n\n return this.each((typeof value === \"function\"\n ? classedFunction : value\n ? classedTrue\n : classedFalse)(names, value));\n }\n\n function textRemove() {\n this.textContent = \"\";\n }\n\n function textConstant(value) {\n return function() {\n this.textContent = value;\n };\n }\n\n function textFunction(value) {\n return function() {\n var v = value.apply(this, arguments);\n this.textContent = v == null ? \"\" : v;\n };\n }\n\n function selection_text(value) {\n return arguments.length\n ? this.each(value == null\n ? textRemove : (typeof value === \"function\"\n ? textFunction\n : textConstant)(value))\n : this.node().textContent;\n }\n\n function htmlRemove() {\n this.innerHTML = \"\";\n }\n\n function htmlConstant(value) {\n return function() {\n this.innerHTML = value;\n };\n }\n\n function htmlFunction(value) {\n return function() {\n var v = value.apply(this, arguments);\n this.innerHTML = v == null ? \"\" : v;\n };\n }\n\n function selection_html(value) {\n return arguments.length\n ? this.each(value == null\n ? htmlRemove : (typeof value === \"function\"\n ? htmlFunction\n : htmlConstant)(value))\n : this.node().innerHTML;\n }\n\n function raise() {\n if (this.nextSibling) this.parentNode.appendChild(this);\n }\n\n function selection_raise() {\n return this.each(raise);\n }\n\n function lower() {\n if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);\n }\n\n function selection_lower() {\n return this.each(lower);\n }\n\n function selection_append(name) {\n var create = typeof name === \"function\" ? name : creator(name);\n return this.select(function() {\n return this.appendChild(create.apply(this, arguments));\n });\n }\n\n function constantNull() {\n return null;\n }\n\n function selection_insert(name, before) {\n var create = typeof name === \"function\" ? name : creator(name),\n select = before == null ? constantNull : typeof before === \"function\" ? before : selector(before);\n return this.select(function() {\n return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);\n });\n }\n\n function remove() {\n var parent = this.parentNode;\n if (parent) parent.removeChild(this);\n }\n\n function selection_remove() {\n return this.each(remove);\n }\n\n function selection_cloneShallow() {\n var clone = this.cloneNode(false), parent = this.parentNode;\n return parent ? parent.insertBefore(clone, this.nextSibling) : clone;\n }\n\n function selection_cloneDeep() {\n var clone = this.cloneNode(true), parent = this.parentNode;\n return parent ? parent.insertBefore(clone, this.nextSibling) : clone;\n }\n\n function selection_clone(deep) {\n return this.select(deep ? selection_cloneDeep : selection_cloneShallow);\n }\n\n function selection_datum(value) {\n return arguments.length\n ? this.property(\"__data__\", value)\n : this.node().__data__;\n }\n\n var filterEvents = {};\n\n var event = null;\n\n if (typeof document !== \"undefined\") {\n var element = document.documentElement;\n if (!(\"onmouseenter\" in element)) {\n filterEvents = {mouseenter: \"mouseover\", mouseleave: \"mouseout\"};\n }\n }\n\n function filterContextListener(listener, index, group) {\n listener = contextListener(listener, index, group);\n return function(event) {\n var related = event.relatedTarget;\n if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {\n listener.call(this, event);\n }\n };\n }\n\n function contextListener(listener, index, group) {\n return function(event1) {\n var event0 = event; // Events can be reentrant (e.g., focus).\n event = event1;\n try {\n listener.call(this, this.__data__, index, group);\n } finally {\n event = event0;\n }\n };\n }\n\n function parseTypenames$1(typenames) {\n return typenames.trim().split(/^|\\s+/).map(function(t) {\n var name = \"\", i = t.indexOf(\".\");\n if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);\n return {type: t, name: name};\n });\n }\n\n function onRemove(typename) {\n return function() {\n var on = this.__on;\n if (!on) return;\n for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {\n if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {\n this.removeEventListener(o.type, o.listener, o.capture);\n } else {\n on[++i] = o;\n }\n }\n if (++i) on.length = i;\n else delete this.__on;\n };\n }\n\n function onAdd(typename, value, capture) {\n var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;\n return function(d, i, group) {\n var on = this.__on, o, listener = wrap(value, i, group);\n if (on) for (var j = 0, m = on.length; j < m; ++j) {\n if ((o = on[j]).type === typename.type && o.name === typename.name) {\n this.removeEventListener(o.type, o.listener, o.capture);\n this.addEventListener(o.type, o.listener = listener, o.capture = capture);\n o.value = value;\n return;\n }\n }\n this.addEventListener(typename.type, listener, capture);\n o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};\n if (!on) this.__on = [o];\n else on.push(o);\n };\n }\n\n function selection_on(typename, value, capture) {\n var typenames = parseTypenames$1(typename + \"\"), i, n = typenames.length, t;\n\n if (arguments.length < 2) {\n var on = this.node().__on;\n if (on) for (var j = 0, m = on.length, o; j < m; ++j) {\n for (i = 0, o = on[j]; i < n; ++i) {\n if ((t = typenames[i]).type === o.type && t.name === o.name) {\n return o.value;\n }\n }\n }\n return;\n }\n\n on = value ? onAdd : onRemove;\n if (capture == null) capture = false;\n for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));\n return this;\n }\n\n function customEvent(event1, listener, that, args) {\n var event0 = event;\n event1.sourceEvent = event;\n event = event1;\n try {\n return listener.apply(that, args);\n } finally {\n event = event0;\n }\n }\n\n function dispatchEvent(node, type, params) {\n var window = defaultView(node),\n event = window.CustomEvent;\n\n if (typeof event === \"function\") {\n event = new event(type, params);\n } else {\n event = window.document.createEvent(\"Event\");\n if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;\n else event.initEvent(type, false, false);\n }\n\n node.dispatchEvent(event);\n }\n\n function dispatchConstant(type, params) {\n return function() {\n return dispatchEvent(this, type, params);\n };\n }\n\n function dispatchFunction(type, params) {\n return function() {\n return dispatchEvent(this, type, params.apply(this, arguments));\n };\n }\n\n function selection_dispatch(type, params) {\n return this.each((typeof params === \"function\"\n ? dispatchFunction\n : dispatchConstant)(type, params));\n }\n\n var root = [null];\n\n function Selection(groups, parents) {\n this._groups = groups;\n this._parents = parents;\n }\n\n function selection() {\n return new Selection([[document.documentElement]], root);\n }\n\n Selection.prototype = selection.prototype = {\n constructor: Selection,\n select: selection_select,\n selectAll: selection_selectAll,\n filter: selection_filter,\n data: selection_data,\n enter: selection_enter,\n exit: selection_exit,\n join: selection_join,\n merge: selection_merge,\n order: selection_order,\n sort: selection_sort,\n call: selection_call,\n nodes: selection_nodes,\n node: selection_node,\n size: selection_size,\n empty: selection_empty,\n each: selection_each,\n attr: selection_attr,\n style: selection_style,\n property: selection_property,\n classed: selection_classed,\n text: selection_text,\n html: selection_html,\n raise: selection_raise,\n lower: selection_lower,\n append: selection_append,\n insert: selection_insert,\n remove: selection_remove,\n clone: selection_clone,\n datum: selection_datum,\n on: selection_on,\n dispatch: selection_dispatch\n };\n\n function select(selector) {\n return typeof selector === \"string\"\n ? new Selection([[document.querySelector(selector)]], [document.documentElement])\n : new Selection([[selector]], root);\n }\n\n function sourceEvent() {\n var current = event, source;\n while (source = current.sourceEvent) current = source;\n return current;\n }\n\n function point(node, event) {\n var svg = node.ownerSVGElement || node;\n\n if (svg.createSVGPoint) {\n var point = svg.createSVGPoint();\n point.x = event.clientX, point.y = event.clientY;\n point = point.matrixTransform(node.getScreenCTM().inverse());\n return [point.x, point.y];\n }\n\n var rect = node.getBoundingClientRect();\n return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];\n }\n\n function mouse(node) {\n var event = sourceEvent();\n if (event.changedTouches) event = event.changedTouches[0];\n return point(node, event);\n }\n\n function touch(node, touches, identifier) {\n if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;\n\n for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {\n if ((touch = touches[i]).identifier === identifier) {\n return point(node, touch);\n }\n }\n\n return null;\n }\n\n function nopropagation() {\n event.stopImmediatePropagation();\n }\n\n function noevent() {\n event.preventDefault();\n event.stopImmediatePropagation();\n }\n\n function nodrag(view) {\n var root = view.document.documentElement,\n selection = select(view).on(\"dragstart.drag\", noevent, true);\n if (\"onselectstart\" in root) {\n selection.on(\"selectstart.drag\", noevent, true);\n } else {\n root.__noselect = root.style.MozUserSelect;\n root.style.MozUserSelect = \"none\";\n }\n }\n\n function yesdrag(view, noclick) {\n var root = view.document.documentElement,\n selection = select(view).on(\"dragstart.drag\", null);\n if (noclick) {\n selection.on(\"click.drag\", noevent, true);\n setTimeout(function() { selection.on(\"click.drag\", null); }, 0);\n }\n if (\"onselectstart\" in root) {\n selection.on(\"selectstart.drag\", null);\n } else {\n root.style.MozUserSelect = root.__noselect;\n delete root.__noselect;\n }\n }\n\n function constant$3(x) {\n return function() {\n return x;\n };\n }\n\n function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {\n this.target = target;\n this.type = type;\n this.subject = subject;\n this.identifier = id;\n this.active = active;\n this.x = x;\n this.y = y;\n this.dx = dx;\n this.dy = dy;\n this._ = dispatch;\n }\n\n DragEvent.prototype.on = function() {\n var value = this._.on.apply(this._, arguments);\n return value === this._ ? this : value;\n };\n\n // Ignore right-click, since that should open the context menu.\n function defaultFilter() {\n return !event.ctrlKey && !event.button;\n }\n\n function defaultContainer() {\n return this.parentNode;\n }\n\n function defaultSubject(d) {\n return d == null ? {x: event.x, y: event.y} : d;\n }\n\n function defaultTouchable() {\n return navigator.maxTouchPoints || (\"ontouchstart\" in this);\n }\n\n function drag() {\n var filter = defaultFilter,\n container = defaultContainer,\n subject = defaultSubject,\n touchable = defaultTouchable,\n gestures = {},\n listeners = dispatch(\"start\", \"drag\", \"end\"),\n active = 0,\n mousedownx,\n mousedowny,\n mousemoving,\n touchending,\n clickDistance2 = 0;\n\n function drag(selection) {\n selection\n .on(\"mousedown.drag\", mousedowned)\n .filter(touchable)\n .on(\"touchstart.drag\", touchstarted)\n .on(\"touchmove.drag\", touchmoved)\n .on(\"touchend.drag touchcancel.drag\", touchended)\n .style(\"touch-action\", \"none\")\n .style(\"-webkit-tap-highlight-color\", \"rgba(0,0,0,0)\");\n }\n\n function mousedowned() {\n if (touchending || !filter.apply(this, arguments)) return;\n var gesture = beforestart(\"mouse\", container.apply(this, arguments), mouse, this, arguments);\n if (!gesture) return;\n select(event.view).on(\"mousemove.drag\", mousemoved, true).on(\"mouseup.drag\", mouseupped, true);\n nodrag(event.view);\n nopropagation();\n mousemoving = false;\n mousedownx = event.clientX;\n mousedowny = event.clientY;\n gesture(\"start\");\n }\n\n function mousemoved() {\n noevent();\n if (!mousemoving) {\n var dx = event.clientX - mousedownx, dy = event.clientY - mousedowny;\n mousemoving = dx * dx + dy * dy > clickDistance2;\n }\n gestures.mouse(\"drag\");\n }\n\n function mouseupped() {\n select(event.view).on(\"mousemove.drag mouseup.drag\", null);\n yesdrag(event.view, mousemoving);\n noevent();\n gestures.mouse(\"end\");\n }\n\n function touchstarted() {\n if (!filter.apply(this, arguments)) return;\n var touches = event.changedTouches,\n c = container.apply(this, arguments),\n n = touches.length, i, gesture;\n\n for (i = 0; i < n; ++i) {\n if (gesture = beforestart(touches[i].identifier, c, touch, this, arguments)) {\n nopropagation();\n gesture(\"start\");\n }\n }\n }\n\n function touchmoved() {\n var touches = event.changedTouches,\n n = touches.length, i, gesture;\n\n for (i = 0; i < n; ++i) {\n if (gesture = gestures[touches[i].identifier]) {\n noevent();\n gesture(\"drag\");\n }\n }\n }\n\n function touchended() {\n var touches = event.changedTouches,\n n = touches.length, i, gesture;\n\n if (touchending) clearTimeout(touchending);\n touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!\n for (i = 0; i < n; ++i) {\n if (gesture = gestures[touches[i].identifier]) {\n nopropagation();\n gesture(\"end\");\n }\n }\n }\n\n function beforestart(id, container, point, that, args) {\n var p = point(container, id), s, dx, dy,\n sublisteners = listeners.copy();\n\n if (!customEvent(new DragEvent(drag, \"beforestart\", s, id, active, p[0], p[1], 0, 0, sublisteners), function() {\n if ((event.subject = s = subject.apply(that, args)) == null) return false;\n dx = s.x - p[0] || 0;\n dy = s.y - p[1] || 0;\n return true;\n })) return;\n\n return function gesture(type) {\n var p0 = p, n;\n switch (type) {\n case \"start\": gestures[id] = gesture, n = active++; break;\n case \"end\": delete gestures[id], --active; // nobreak\n case \"drag\": p = point(container, id), n = active; break;\n }\n customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);\n };\n }\n\n drag.filter = function(_) {\n return arguments.length ? (filter = typeof _ === \"function\" ? _ : constant$3(!!_), drag) : filter;\n };\n\n drag.container = function(_) {\n return arguments.length ? (container = typeof _ === \"function\" ? _ : constant$3(_), drag) : container;\n };\n\n drag.subject = function(_) {\n return arguments.length ? (subject = typeof _ === \"function\" ? _ : constant$3(_), drag) : subject;\n };\n\n drag.touchable = function(_) {\n return arguments.length ? (touchable = typeof _ === \"function\" ? _ : constant$3(!!_), drag) : touchable;\n };\n\n drag.on = function() {\n var value = listeners.on.apply(listeners, arguments);\n return value === listeners ? drag : value;\n };\n\n drag.clickDistance = function(_) {\n return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);\n };\n\n return drag;\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$a = Template('d-slider', `\n\n\n
        \n
        \n
        \n
        \n
        \n
        \n
        \n
        \n
        \n`);\n\n // ARIA\n // If the slider has a visible label, it is referenced by aria-labelledby on the slider element. Otherwise, the slider element has a label provided by aria-label.\n // If the slider is vertically oriented, it has aria-orientation set to vertical. The default value of aria-orientation for a slider is horizontal.\n\n const keyCodes = {\n left: 37,\n up: 38,\n right: 39,\n down: 40,\n pageUp: 33,\n pageDown: 34,\n end: 35,\n home: 36\n };\n\n class Slider extends T$a(HTMLElement) {\n\n\n connectedCallback() {\n this.connected = true;\n this.setAttribute('role', 'slider');\n // Makes the element tab-able.\n if (!this.hasAttribute('tabindex')) { this.setAttribute('tabindex', 0); }\n\n // Keeps track of keyboard vs. mouse interactions for focus rings\n this.mouseEvent = false;\n\n // Handles to shadow DOM elements\n this.knob = this.root.querySelector('.knob-container');\n this.background = this.root.querySelector('.background');\n this.trackFill = this.root.querySelector('.track-fill');\n this.track = this.root.querySelector('.track');\n\n // Default values for attributes\n this.min = this.min ? this.min : 0;\n this.max = this.max ? this.max : 100;\n this.scale = linear$1().domain([this.min, this.max]).range([0, 1]).clamp(true);\n\n this.origin = this.origin !== undefined ? this.origin : this.min;\n this.step = this.step ? this.step : 1;\n this.update(this.value ? this.value : 0);\n\n this.ticks = this.ticks ? this.ticks : false;\n this.renderTicks();\n\n this.drag = drag()\n .container(this.background)\n .on('start', () => {\n this.mouseEvent = true;\n this.background.classList.add('mousedown');\n this.changeValue = this.value;\n this.dragUpdate();\n })\n .on('drag', () => {\n this.dragUpdate();\n })\n .on('end', () => {\n this.mouseEvent = false;\n this.background.classList.remove('mousedown');\n this.dragUpdate();\n if (this.changeValue !== this.value) this.dispatchChange();\n this.changeValue = this.value;\n });\n this.drag(select(this.background));\n\n this.addEventListener('focusin', () => {\n if(!this.mouseEvent) {\n this.background.classList.add('focus');\n }\n });\n this.addEventListener('focusout', () => {\n this.background.classList.remove('focus');\n });\n this.addEventListener('keydown', this.onKeyDown);\n\n }\n\n static get observedAttributes() {return ['min', 'max', 'value', 'step', 'ticks', 'origin', 'tickValues', 'tickLabels']; }\n\n attributeChangedCallback(attr, oldValue, newValue) {\n if (isNaN(newValue) || newValue === undefined || newValue === null) return;\n if (attr == 'min') {\n this.min = +newValue;\n this.setAttribute('aria-valuemin', this.min);\n }\n if (attr == 'max') {\n this.max = +newValue;\n this.setAttribute('aria-valuemax', this.max);\n }\n if (attr == 'value') {\n this.update(+newValue);\n }\n if (attr == 'origin') {\n this.origin = +newValue;\n // this.update(this.value);\n }\n if (attr == 'step') {\n if (newValue > 0) {\n this.step = +newValue;\n }\n }\n if (attr == 'ticks') {\n this.ticks = (newValue === '' ? true : newValue);\n }\n }\n\n onKeyDown(event) {\n this.changeValue = this.value;\n let stopPropagation = false;\n switch (event.keyCode) {\n case keyCodes.left:\n case keyCodes.down:\n this.update(this.value - this.step);\n stopPropagation = true;\n break;\n case keyCodes.right:\n case keyCodes.up:\n this.update(this.value + this.step);\n stopPropagation = true;\n break;\n case keyCodes.pageUp:\n this.update(this.value + this.step * 10);\n stopPropagation = true;\n break;\n\n case keyCodes.pageDown:\n this.update(this.value + this.step * 10);\n stopPropagation = true;\n break;\n case keyCodes.home:\n this.update(this.min);\n stopPropagation = true;\n break;\n case keyCodes.end:\n this.update(this.max);\n stopPropagation = true;\n break;\n }\n if (stopPropagation) {\n this.background.classList.add('focus');\n event.preventDefault();\n event.stopPropagation();\n if (this.changeValue !== this.value) this.dispatchChange();\n }\n }\n\n validateValueRange(min, max, value) {\n return Math.max(Math.min(max, value), min);\n }\n\n quantizeValue(value, step) {\n return Math.round(value / step) * step;\n }\n\n dragUpdate() {\n const bbox = this.background.getBoundingClientRect();\n const x = event.x;\n const width = bbox.width;\n this.update(this.scale.invert(x / width));\n }\n\n update(value) {\n let v = value;\n if (this.step !== 'any') {\n v = this.quantizeValue(value, this.step);\n }\n v = this.validateValueRange(this.min, this.max, v);\n if (this.connected) {\n this.knob.style.left = this.scale(v) * 100 + '%';\n this.trackFill.style.width = this.scale(this.min + Math.abs(v - this.origin)) * 100 + '%';\n this.trackFill.style.left = this.scale(Math.min(v, this.origin)) * 100 + '%';\n }\n if (this.value !== v) {\n this.value = v;\n this.setAttribute('aria-valuenow', this.value);\n this.dispatchInput();\n }\n }\n\n // Dispatches only on a committed change (basically only on mouseup).\n dispatchChange() {\n const e = new Event('change');\n this.dispatchEvent(e, {});\n }\n\n // Dispatches on each value change.\n dispatchInput() {\n const e = new Event('input');\n this.dispatchEvent(e, {});\n }\n\n renderTicks() {\n const ticksContainer = this.root.querySelector('.ticks');\n if (this.ticks !== false) {\n let tickData = [];\n if (this.ticks > 0) {\n tickData = this.scale.ticks(this.ticks);\n } else if (this.step === 'any') {\n tickData = this.scale.ticks();\n } else {\n tickData = range(this.min, this.max + 1e-6, this.step);\n }\n tickData.forEach(d => {\n const tick = document.createElement('div');\n tick.classList.add('tick');\n tick.style.left = this.scale(d) * 100 + '%';\n ticksContainer.appendChild(tick);\n });\n } else {\n ticksContainer.style.display = 'none';\n }\n }\n }\n\n var logo = \"\\n \\n\\n\";\n\n const headerTemplate = `\n\n
        \n \n ${logo}\n Distill\n \n \n
        \n`;\n\n // Copyright 2018 The Distill Template Authors\n\n const T$b = Template('distill-header', headerTemplate, false);\n\n class DistillHeader extends T$b(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const styles$2 = `\n\n`;\n\n function appendixTemplate(frontMatter) {\n let html = styles$2;\n\n if (typeof frontMatter.githubUrl !== 'undefined') {\n html += `\n

        Updates and Corrections

        \n

        `;\n if (frontMatter.githubCompareUpdatesUrl) {\n html += `View all changes to this article since it was first published.`;\n }\n html += `\n If you see mistakes or want to suggest changes, please create an issue on GitHub.

        \n `;\n }\n\n const journal = frontMatter.journal;\n if (typeof journal !== 'undefined' && journal.title === 'Distill') {\n html += `\n

        Reuse

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(factory) {\n typeof define === 'function' && define.amd ? define(factory) :\n factory();\n}((function () { 'use strict';\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n const days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];\n const months = ['Jan.', 'Feb.', 'March', 'April', 'May', 'June', 'July', 'Aug.', 'Sept.', 'Oct.', 'Nov.', 'Dec.'];\n const zeroPad = n => n < 10 ? '0' + n : n;\n\n const RFC = function(date) {\n const day = days[date.getDay()].substring(0, 3);\n const paddedDate = zeroPad(date.getDate());\n const month = months[date.getMonth()].substring(0,3);\n const year = date.getFullYear().toString();\n const hours = date.getUTCHours().toString();\n const minutes = date.getUTCMinutes().toString();\n const seconds = date.getUTCSeconds().toString();\n return `${day}, ${paddedDate} ${month} ${year} ${hours}:${minutes}:${seconds} Z`;\n };\n\n const objectFromMap = function(map) {\n const object = Array.from(map).reduce((object, [key, value]) => (\n Object.assign(object, { [key]: value }) // Be careful! Maps can have non-String keys; object literals can't.\n ), {});\n return object;\n };\n\n const mapFromObject = function(object) {\n const map = new Map();\n for (var property in object) {\n if (object.hasOwnProperty(property)) {\n map.set(property, object[property]);\n }\n }\n return map;\n };\n\n class Author {\n\n // constructor(name='', personalURL='', affiliation='', affiliationURL='') {\n // this.name = name; // 'Chris Olah'\n // this.personalURL = personalURL; // 'https://colah.github.io'\n // this.affiliation = affiliation; // 'Google Brain'\n // this.affiliationURL = affiliationURL; // 'https://g.co/brain'\n // }\n\n constructor(object) {\n this.name = object.author; // 'Chris Olah'\n this.personalURL = object.authorURL; // 'https://colah.github.io'\n this.affiliation = object.affiliation; // 'Google Brain'\n this.affiliationURL = object.affiliationURL; // 'https://g.co/brain'\n this.affiliations = object.affiliations || []; // new-style affiliations\n }\n\n // 'Chris'\n get firstName() {\n const names = this.name.split(' ');\n return names.slice(0, names.length - 1).join(' ');\n }\n\n // 'Olah'\n get lastName() {\n const names = this.name.split(' ');\n return names[names.length -1];\n }\n }\n\n function mergeFromYMLFrontmatter(target, source) {\n target.title = source.title;\n if (source.published) {\n if (source.published instanceof Date) {\n target.publishedDate = source.published;\n } else if (source.published.constructor === String) {\n target.publishedDate = new Date(source.published);\n }\n }\n if (source.publishedDate) {\n if (source.publishedDate instanceof Date) {\n target.publishedDate = source.publishedDate;\n } else if (source.publishedDate.constructor === String) {\n target.publishedDate = new Date(source.publishedDate);\n } else {\n console.error('Don\\'t know what to do with published date: ' + source.publishedDate);\n }\n }\n target.description = source.description;\n target.authors = source.authors.map( (authorObject) => new Author(authorObject));\n target.katex = source.katex;\n target.password = source.password;\n if (source.doi) {\n target.doi = source.doi;\n }\n }\n\n class FrontMatter {\n constructor() {\n this.title = 'unnamed article'; // 'Attention and Augmented Recurrent Neural Networks'\n this.description = ''; // 'A visual overview of neural attention...'\n this.authors = []; // Array of Author(s)\n\n this.bibliography = new Map();\n this.bibliographyParsed = false;\n // {\n // 'gregor2015draw': {\n // 'title': 'DRAW: A recurrent neural network for image generation',\n // 'author': 'Gregor, Karol and Danihelka, Ivo and Graves, Alex and Rezende, Danilo Jimenez and Wierstra, Daan',\n // 'journal': 'arXiv preprint arXiv:1502.04623',\n // 'year': '2015',\n // 'url': 'https://arxiv.org/pdf/1502.04623.pdf',\n // 'type': 'article'\n // },\n // }\n\n // Citation keys should be listed in the order that they are appear in the document.\n // Each key refers to a key in the bibliography dictionary.\n this.citations = []; // [ 'gregor2015draw', 'mercier2011humans' ]\n this.citationsCollected = false;\n\n //\n // Assigned from posts.csv\n //\n\n // publishedDate: 2016-09-08T07:00:00.000Z,\n // tags: [ 'rnn' ],\n // distillPath: '2016/augmented-rnns',\n // githubPath: 'distillpub/post--augmented-rnns',\n // doiSuffix: 1,\n\n //\n // Assigned from journal\n //\n this.journal = {};\n // journal: {\n // 'title': 'Distill',\n // 'full_title': 'Distill',\n // 'abbrev_title': 'Distill',\n // 'url': 'http://distill.pub',\n // 'doi': '10.23915/distill',\n // 'publisherName': 'Distill Working Group',\n // 'publisherEmail': 'admin@distill.pub',\n // 'issn': '2476-0757',\n // 'editors': [...],\n // 'committee': [...]\n // }\n // volume: 1,\n // issue: 9,\n\n this.katex = {};\n\n //\n // Assigned from publishing process\n //\n\n // githubCompareUpdatesUrl: 'https://github.com/distillpub/post--augmented-rnns/compare/1596e094d8943d2dc0ea445d92071129c6419c59...3bd9209e0c24d020f87cf6152dcecc6017cbc193',\n // updatedDate: 2017-03-21T07:13:16.000Z,\n // doi: '10.23915/distill.00001',\n this.doi = undefined;\n this.publishedDate = undefined;\n }\n\n // Example:\n // title: Demo Title Attention and Augmented Recurrent Neural Networks\n // published: Jan 10, 2017\n // authors:\n // - Chris Olah:\n // - Shan Carter: http://shancarter.com\n // affiliations:\n // - Google Brain:\n // - Google Brain: http://g.co/brain\n\n //\n // Computed Properties\n //\n\n // 'http://distill.pub/2016/augmented-rnns',\n set url(value) {\n this._url = value;\n }\n get url() {\n if (this._url) {\n return this._url;\n } else if (this.distillPath && this.journal.url) {\n return this.journal.url + '/' + this.distillPath;\n } else if (this.journal.url) {\n return this.journal.url;\n }\n }\n\n // 'https://github.com/distillpub/post--augmented-rnns',\n get githubUrl() {\n if (this.githubPath) {\n return 'https://github.com/' + this.githubPath;\n } else {\n return undefined;\n }\n }\n\n // TODO resolve differences in naming of URL/Url/url.\n // 'http://distill.pub/2016/augmented-rnns/thumbnail.jpg',\n set previewURL(value) {\n this._previewURL = value;\n }\n get previewURL() {\n return this._previewURL ? this._previewURL : this.url + '/thumbnail.jpg';\n }\n\n // 'Thu, 08 Sep 2016 00:00:00 -0700',\n get publishedDateRFC() {\n return RFC(this.publishedDate);\n }\n\n // 'Thu, 08 Sep 2016 00:00:00 -0700',\n get updatedDateRFC() {\n return RFC(this.updatedDate);\n }\n\n // 2016,\n get publishedYear() {\n return this.publishedDate.getFullYear();\n }\n\n // 'Sept',\n get publishedMonth() {\n return months[this.publishedDate.getMonth()];\n }\n\n // 8,\n get publishedDay() {\n return this.publishedDate.getDate();\n }\n\n // '09',\n get publishedMonthPadded() {\n return zeroPad(this.publishedDate.getMonth() + 1);\n }\n\n // '08',\n get publishedDayPadded() {\n return zeroPad(this.publishedDate.getDate());\n }\n\n get publishedISODateOnly() {\n return this.publishedDate.toISOString().split('T')[0];\n }\n\n get volume() {\n const volume = this.publishedYear - 2015;\n if (volume < 1) {\n throw new Error('Invalid publish date detected during computing volume');\n }\n return volume;\n }\n\n get issue() {\n return this.publishedDate.getMonth() + 1;\n }\n\n // 'Olah & Carter',\n get concatenatedAuthors() {\n if (this.authors.length > 2) {\n return this.authors[0].lastName + ', et al.';\n } else if (this.authors.length === 2) {\n return this.authors[0].lastName + ' & ' + this.authors[1].lastName;\n } else if (this.authors.length === 1) {\n return this.authors[0].lastName;\n }\n }\n\n // 'Olah, Chris and Carter, Shan',\n get bibtexAuthors() {\n return this.authors.map(author => {\n return author.lastName + ', ' + author.firstName;\n }).join(' and ');\n }\n\n // 'olah2016attention'\n get slug() {\n let slug = '';\n if (this.authors.length) {\n slug += this.authors[0].lastName.toLowerCase();\n slug += this.publishedYear;\n slug += this.title.split(' ')[0].toLowerCase();\n }\n return slug || 'Untitled';\n }\n\n get bibliographyEntries() {\n return new Map(this.citations.map( citationKey => {\n const entry = this.bibliography.get(citationKey);\n return [citationKey, entry];\n }));\n }\n\n set bibliography(bibliography) {\n if (bibliography instanceof Map) {\n this._bibliography = bibliography;\n } else if (typeof bibliography === 'object') {\n this._bibliography = mapFromObject(bibliography);\n }\n }\n\n get bibliography() {\n return this._bibliography;\n }\n\n static fromObject(source) {\n const frontMatter = new FrontMatter();\n Object.assign(frontMatter, source);\n return frontMatter;\n }\n\n assignToObject(target) {\n Object.assign(target, this);\n target.bibliography = objectFromMap(this.bibliographyEntries);\n target.url = this.url;\n target.doi = this.doi;\n target.githubUrl = this.githubUrl;\n target.previewURL = this.previewURL;\n if (this.publishedDate) {\n target.volume = this.volume;\n target.issue = this.issue;\n target.publishedDateRFC = this.publishedDateRFC;\n target.publishedYear = this.publishedYear;\n target.publishedMonth = this.publishedMonth;\n target.publishedDay = this.publishedDay;\n target.publishedMonthPadded = this.publishedMonthPadded;\n target.publishedDayPadded = this.publishedDayPadded;\n }\n if (this.updatedDate) {\n target.updatedDateRFC = this.updatedDateRFC;\n }\n target.concatenatedAuthors = this.concatenatedAuthors;\n target.bibtexAuthors = this.bibtexAuthors;\n target.slug = this.slug;\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n const Mutating = (superclass) => {\n return class extends superclass {\n\n constructor() {\n super();\n\n // set up mutation observer\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver( () => {\n observer.disconnect();\n this.renderIfPossible();\n observer.observe(this, options);\n });\n\n // ...and listen for changes\n observer.observe(this, options);\n }\n\n connectedCallback() {\n super.connectedCallback();\n\n this.renderIfPossible();\n }\n\n // potential TODO: check if this is enough for all our usecases\n // maybe provide a custom function to tell if we have enough information to render\n renderIfPossible() {\n if (this.textContent && this.root) {\n this.renderContent();\n }\n }\n\n renderContent() {\n console.error(`Your class ${this.constructor.name} must provide a custom renderContent() method!` );\n }\n\n }; // end class\n }; // end mixin function\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n /*global ShadyCSS*/\n\n const Template = (name, templateString, useShadow = true) => {\n\n return (superclass) => {\n\n const template = document.createElement('template');\n template.innerHTML = templateString;\n\n if (useShadow && 'ShadyCSS' in window) {\n ShadyCSS.prepareTemplate(template, name);\n }\n\n return class extends superclass {\n\n static get is() { return name; }\n\n constructor() {\n super();\n\n this.clone = document.importNode(template.content, true);\n if (useShadow) {\n this.attachShadow({mode: 'open'});\n this.shadowRoot.appendChild(this.clone);\n }\n }\n\n connectedCallback() {\n if (this.hasAttribute('distill-prerendered')) {\n return;\n }\n if (useShadow) {\n if ('ShadyCSS' in window) {\n ShadyCSS.styleElement(this);\n }\n } else {\n this.insertBefore(this.clone, this.firstChild);\n }\n }\n\n get root() {\n if (useShadow) {\n return this.shadowRoot;\n } else {\n return this;\n }\n }\n\n /* TODO: Are we using these? Should we even? */\n $(query) {\n return this.root.querySelector(query);\n }\n\n $$(query) {\n return this.root.querySelectorAll(query);\n }\n };\n };\n };\n\n var math = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nspan.katex-display {\\n text-align: left;\\n padding: 8px 0 8px 0;\\n margin: 0.5em 0 0.5em 1em;\\n}\\n\\nspan.katex {\\n -webkit-font-smoothing: antialiased;\\n color: rgba(0, 0, 0, 0.8);\\n font-size: 1.18em;\\n}\\n\";\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // This is a straight concatenation of code from KaTeX's contrib folder,\n // but we aren't using some of their helpers that don't work well outside a browser environment.\n\n /*global katex */\n\n const findEndOfMath = function(delimiter, text, startIndex) {\n // Adapted from\n // https://github.com/Khan/perseus/blob/master/src/perseus-markdown.jsx\n let index = startIndex;\n let braceLevel = 0;\n\n const delimLength = delimiter.length;\n\n while (index < text.length) {\n const character = text[index];\n\n if (\n braceLevel <= 0 &&\n text.slice(index, index + delimLength) === delimiter\n ) {\n return index;\n } else if (character === \"\\\\\") {\n index++;\n } else if (character === \"{\") {\n braceLevel++;\n } else if (character === \"}\") {\n braceLevel--;\n }\n\n index++;\n }\n\n return -1;\n };\n\n const splitAtDelimiters = function(startData, leftDelim, rightDelim, display) {\n const finalData = [];\n\n for (let i = 0; i < startData.length; i++) {\n if (startData[i].type === \"text\") {\n const text = startData[i].data;\n\n let lookingForLeft = true;\n let currIndex = 0;\n let nextIndex;\n\n nextIndex = text.indexOf(leftDelim);\n if (nextIndex !== -1) {\n currIndex = nextIndex;\n finalData.push({\n type: \"text\",\n data: text.slice(0, currIndex)\n });\n lookingForLeft = false;\n }\n\n while (true) {\n // eslint-disable-line no-constant-condition\n if (lookingForLeft) {\n nextIndex = text.indexOf(leftDelim, currIndex);\n if (nextIndex === -1) {\n break;\n }\n\n finalData.push({\n type: \"text\",\n data: text.slice(currIndex, nextIndex)\n });\n\n currIndex = nextIndex;\n } else {\n nextIndex = findEndOfMath(\n rightDelim,\n text,\n currIndex + leftDelim.length\n );\n if (nextIndex === -1) {\n break;\n }\n\n finalData.push({\n type: \"math\",\n data: text.slice(currIndex + leftDelim.length, nextIndex),\n rawData: text.slice(currIndex, nextIndex + rightDelim.length),\n display: display\n });\n\n currIndex = nextIndex + rightDelim.length;\n }\n\n lookingForLeft = !lookingForLeft;\n }\n\n finalData.push({\n type: \"text\",\n data: text.slice(currIndex)\n });\n } else {\n finalData.push(startData[i]);\n }\n }\n\n return finalData;\n };\n\n const splitWithDelimiters = function(text, delimiters) {\n let data = [{ type: \"text\", data: text }];\n for (let i = 0; i < delimiters.length; i++) {\n const delimiter = delimiters[i];\n data = splitAtDelimiters(\n data,\n delimiter.left,\n delimiter.right,\n delimiter.display || false\n );\n }\n return data;\n };\n\n /* Note: optionsCopy is mutated by this method. If it is ever exposed in the\n * API, we should copy it before mutating.\n */\n const renderMathInText = function(text, optionsCopy) {\n const data = splitWithDelimiters(text, optionsCopy.delimiters);\n const fragment = document.createDocumentFragment();\n\n for (let i = 0; i < data.length; i++) {\n if (data[i].type === \"text\") {\n fragment.appendChild(document.createTextNode(data[i].data));\n } else {\n const tag = document.createElement(\"d-math\");\n const math = data[i].data;\n // Override any display mode defined in the settings with that\n // defined by the text itself\n optionsCopy.displayMode = data[i].display;\n try {\n tag.textContent = math;\n if (optionsCopy.displayMode) {\n tag.setAttribute(\"block\", \"\");\n }\n } catch (e) {\n if (!(e instanceof katex.ParseError)) {\n throw e;\n }\n optionsCopy.errorCallback(\n \"KaTeX auto-render: Failed to parse `\" + data[i].data + \"` with \",\n e\n );\n fragment.appendChild(document.createTextNode(data[i].rawData));\n continue;\n }\n fragment.appendChild(tag);\n }\n }\n\n return fragment;\n };\n\n const renderElem = function(elem, optionsCopy) {\n for (let i = 0; i < elem.childNodes.length; i++) {\n const childNode = elem.childNodes[i];\n if (childNode.nodeType === 3) {\n // Text node\n const text = childNode.textContent;\n if (optionsCopy.mightHaveMath(text)) {\n const frag = renderMathInText(text, optionsCopy);\n i += frag.childNodes.length - 1;\n elem.replaceChild(frag, childNode);\n }\n } else if (childNode.nodeType === 1) {\n // Element node\n const shouldRender =\n optionsCopy.ignoredTags.indexOf(childNode.nodeName.toLowerCase()) ===\n -1;\n\n if (shouldRender) {\n renderElem(childNode, optionsCopy);\n }\n }\n // Otherwise, it's something else, and ignore it.\n }\n };\n\n const defaultAutoRenderOptions = {\n delimiters: [\n { left: \"$$\", right: \"$$\", display: true },\n { left: \"\\\\[\", right: \"\\\\]\", display: true },\n { left: \"\\\\(\", right: \"\\\\)\", display: false }\n // LaTeX uses this, but it ruins the display of normal `$` in text:\n // {left: '$', right: '$', display: false},\n ],\n\n ignoredTags: [\n \"script\",\n \"noscript\",\n \"style\",\n \"textarea\",\n \"pre\",\n \"code\",\n \"svg\"\n ],\n\n errorCallback: function(msg, err) {\n console.error(msg, err);\n }\n };\n\n const renderMathInElement = function(elem, options) {\n if (!elem) {\n throw new Error(\"No element provided to render\");\n }\n\n const optionsCopy = Object.assign({}, defaultAutoRenderOptions, options);\n const delimiterStrings = optionsCopy.delimiters.flatMap(d => [\n d.left,\n d.right\n ]);\n const mightHaveMath = text =>\n delimiterStrings.some(d => text.indexOf(d) !== -1);\n optionsCopy.mightHaveMath = mightHaveMath;\n renderElem(elem, optionsCopy);\n };\n\n // Copyright 2018 The Distill Template Authors\n\n const katexJSURL = 'https://distill.pub/third-party/katex/katex.min.js';\n const katexCSSTag = '';\n\n const T = Template('d-math', `\n${katexCSSTag}\n\n\n`);\n\n // DMath, not Math, because that would conflict with the JS built-in\n class DMath extends Mutating(T(HTMLElement)) {\n\n static set katexOptions(options) {\n DMath._katexOptions = options;\n if (DMath.katexOptions.delimiters) {\n if (!DMath.katexAdded) {\n DMath.addKatex();\n } else {\n DMath.katexLoadedCallback();\n }\n }\n }\n\n static get katexOptions() {\n if (!DMath._katexOptions) {\n DMath._katexOptions = {\n delimiters: [ { 'left':'$$', 'right':'$$', 'display': false } ]\n };\n }\n return DMath._katexOptions;\n }\n\n static katexLoadedCallback() {\n // render all d-math tags\n const mathTags = document.querySelectorAll('d-math');\n for (const mathTag of mathTags) {\n mathTag.renderContent();\n }\n // transform inline delimited math to d-math tags\n if (DMath.katexOptions.delimiters) {\n renderMathInElement(document.body, DMath.katexOptions);\n }\n }\n\n static addKatex() {\n // css tag can use this convenience function\n document.head.insertAdjacentHTML('beforeend', katexCSSTag);\n // script tag has to be created to work properly\n const scriptTag = document.createElement('script');\n scriptTag.src = katexJSURL;\n scriptTag.async = true;\n scriptTag.onload = DMath.katexLoadedCallback;\n scriptTag.crossorigin = 'anonymous';\n document.head.appendChild(scriptTag);\n\n DMath.katexAdded = true;\n }\n\n get options() {\n const localOptions = { displayMode: this.hasAttribute('block') };\n return Object.assign(localOptions, DMath.katexOptions);\n }\n\n connectedCallback() {\n super.connectedCallback();\n if (!DMath.katexAdded) {\n DMath.addKatex();\n }\n }\n\n renderContent() {\n if (typeof katex !== 'undefined') {\n const container = this.root.querySelector('#katex-container');\n katex.render(this.textContent, container, this.options);\n }\n }\n\n }\n\n DMath.katexAdded = false;\n DMath.inlineMathRendered = false;\n window.DMath = DMath; // TODO: check if this can be removed, or if we should expose a distill global\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n function collect_citations(dom = document) {\n const citations = new Set();\n const citeTags = dom.querySelectorAll(\"d-cite\");\n for (const tag of citeTags) {\n const keyString = tag.getAttribute(\"key\") || tag.getAttribute(\"bibtex-key\");\n const keys = keyString.split(\",\").map(k => k.trim());\n for (const key of keys) {\n citations.add(key);\n }\n }\n return [...citations];\n }\n\n function author_string(ent, template, sep, finalSep) {\n if (ent.author == null) {\n return \"\";\n }\n var names = ent.author.split(\" and \");\n let name_strings = names.map(name => {\n name = name.trim();\n if (name.indexOf(\",\") != -1) {\n var last = name.split(\",\")[0].trim();\n var firsts = name.split(\",\")[1];\n } else if (name.indexOf(\" \") != -1) {\n var last = name\n .split(\" \")\n .slice(-1)[0]\n .trim();\n var firsts = name\n .split(\" \")\n .slice(0, -1)\n .join(\" \");\n } else {\n var last = name.trim();\n }\n var initials = \"\";\n if (firsts != undefined) {\n initials = firsts\n .trim()\n .split(\" \")\n .map(s => s.trim()[0]);\n initials = initials.join(\".\") + \".\";\n }\n return template\n .replace(\"${F}\", firsts)\n .replace(\"${L}\", last)\n .replace(\"${I}\", initials)\n .trim(); // in case one of first or last was empty\n });\n if (names.length > 1) {\n var str = name_strings.slice(0, names.length - 1).join(sep);\n str += (finalSep || sep) + name_strings[names.length - 1];\n return str;\n } else {\n return name_strings[0];\n }\n }\n\n function venue_string(ent) {\n var cite = ent.journal || ent.booktitle || \"\";\n if (\"volume\" in ent) {\n var issue = ent.issue || ent.number;\n issue = issue != undefined ? \"(\" + issue + \")\" : \"\";\n cite += \", Vol \" + ent.volume + issue;\n }\n if (\"pages\" in ent) {\n cite += \", pp. \" + ent.pages;\n }\n if (cite != \"\") cite += \". \";\n if (\"publisher\" in ent) {\n cite += ent.publisher;\n if (cite[cite.length - 1] != \".\") cite += \".\";\n }\n return cite;\n }\n\n function link_string(ent) {\n if (\"url\" in ent) {\n var url = ent.url;\n var arxiv_match = /arxiv\\.org\\/abs\\/([0-9\\.]*)/.exec(url);\n if (arxiv_match != null) {\n url = `http://arxiv.org/pdf/${arxiv_match[1]}.pdf`;\n }\n\n if (url.slice(-4) == \".pdf\") {\n var label = \"PDF\";\n } else if (url.slice(-5) == \".html\") {\n var label = \"HTML\";\n }\n return `  [${label || \"link\"}]`;\n } /* else if (\"doi\" in ent){\n return `  [DOI]`;\n }*/ else {\n return \"\";\n }\n }\n function doi_string(ent, new_line) {\n if (\"doi\" in ent) {\n return `${new_line ? \"
        \" : \"\"} DOI: ${ent.doi}`;\n } else {\n return \"\";\n }\n }\n\n function title_string(ent) {\n return '' + ent.title + \" \";\n }\n\n function bibliography_cite(ent, fancy) {\n if (ent) {\n var cite = title_string(ent);\n cite += link_string(ent) + \"
        \";\n if (ent.author) {\n cite += author_string(ent, \"${L}, ${I}\", \", \", \" and \");\n if (ent.year || ent.date) {\n cite += \", \";\n }\n }\n if (ent.year || ent.date) {\n cite += (ent.year || ent.date) + \". \";\n } else {\n cite += \". \";\n }\n cite += venue_string(ent);\n cite += doi_string(ent);\n return cite;\n /*var cite = author_string(ent, \"${L}, ${I}\", \", \", \" and \");\n if (ent.year || ent.date){\n cite += \", \" + (ent.year || ent.date) + \". \"\n } else {\n cite += \". \"\n }\n cite += \"\" + ent.title + \". \";\n cite += venue_string(ent);\n cite += doi_string(ent);\n cite += link_string(ent);\n return cite*/\n } else {\n return \"?\";\n }\n }\n\n function hover_cite(ent) {\n if (ent) {\n var cite = \"\";\n cite += \"\" + ent.title + \"\";\n cite += link_string(ent);\n cite += \"
        \";\n\n var a_str = author_string(ent, \"${I} ${L}\", \", \") + \".\";\n var v_str =\n venue_string(ent).trim() + \" \" + ent.year + \". \" + doi_string(ent, true);\n\n if ((a_str + v_str).length < Math.min(40, ent.title.length)) {\n cite += a_str + \" \" + v_str;\n } else {\n cite += a_str + \"
        \" + v_str;\n }\n return cite;\n } else {\n return \"?\";\n }\n }\n\n function domContentLoaded() {\n return ['interactive', 'complete'].indexOf(document.readyState) !== -1;\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n function _moveLegacyAffiliationFormatIntoArray(frontMatter) {\n // authors used to have propoerties \"affiliation\" and \"affiliationURL\".\n // We now encourage using an array for affiliations containing objects with\n // properties \"name\" and \"url\".\n for (let author of frontMatter.authors) {\n const hasOldStyle = Boolean(author.affiliation);\n const hasNewStyle = Boolean(author.affiliations);\n if (!hasOldStyle) continue;\n if (hasNewStyle) {\n console.warn(`Author ${author.author} has both old-style (\"affiliation\" & \"affiliationURL\") and new style (\"affiliations\") affiliation information!`);\n } else {\n let newAffiliation = {\n \"name\": author.affiliation\n };\n if (author.affiliationURL) newAffiliation.url = author.affiliationURL;\n author.affiliations = [newAffiliation];\n }\n }\n return frontMatter\n }\n\n function parseFrontmatter(element) {\n const scriptTag = element.firstElementChild;\n if (scriptTag) {\n const type = scriptTag.getAttribute('type');\n if (type.split('/')[1] == 'json') {\n const content = scriptTag.textContent;\n const parsed = JSON.parse(content);\n return _moveLegacyAffiliationFormatIntoArray(parsed);\n } else {\n console.error('Distill only supports JSON frontmatter tags anymore; no more YAML.');\n }\n } else {\n console.error('You added a frontmatter tag but did not provide a script tag with front matter data in it. Please take a look at our templates.');\n }\n return {};\n }\n\n class FrontMatter$1 extends HTMLElement {\n\n static get is() { return 'd-front-matter'; }\n\n constructor() {\n super();\n\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver( (entries) => {\n for (const entry of entries) {\n if (entry.target.nodeName === 'SCRIPT' || entry.type === 'characterData') {\n const data = parseFrontmatter(this);\n this.notify(data);\n }\n }\n });\n observer.observe(this, options);\n }\n\n notify(data) {\n const options = { detail: data, bubbles: true };\n const event = new CustomEvent('onFrontMatterChanged', options);\n document.dispatchEvent(event);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // no appendix -> add appendix\n // title in front, no h1 -> add it\n // no title in front, h1 -> read and put into frontMatter\n // footnote -> footnote list\n // break up bib\n // if citation, no bib-list -> add citation-list\n\n // if authors, no byline -> add byline\n\n function optionalComponents(dom, data) {\n const body = dom.body;\n const article = body.querySelector('d-article');\n\n // If we don't have an article tag, something weird is going on—giving up.\n if (!article) {\n console.warn('No d-article tag found; skipping adding optional components!');\n return;\n }\n\n let byline = dom.querySelector('d-byline');\n if (!byline) {\n if (data.authors) {\n byline = dom.createElement('d-byline');\n body.insertBefore(byline, article);\n } else {\n console.warn('No authors found in front matter; please add them before submission!');\n }\n }\n\n let title = dom.querySelector('d-title');\n if (!title) {\n title = dom.createElement('d-title');\n body.insertBefore(title, byline);\n }\n\n let h1 = title.querySelector('h1');\n if (!h1) {\n h1 = dom.createElement('h1');\n h1.textContent = data.title;\n title.insertBefore(h1, title.firstChild);\n }\n\n const hasPassword = typeof data.password !== 'undefined';\n let interstitial = body.querySelector('d-interstitial');\n if (hasPassword && !interstitial) {\n const inBrowser = typeof window !== 'undefined';\n const onLocalhost = inBrowser && window.location.hostname.includes('localhost');\n if (!inBrowser || !onLocalhost) {\n interstitial = dom.createElement('d-interstitial');\n interstitial.password = data.password;\n body.insertBefore(interstitial, body.firstChild);\n }\n } else if (!hasPassword && interstitial) {\n interstitial.parentElement.removeChild(this);\n }\n\n let appendix = dom.querySelector('d-appendix');\n if (!appendix) {\n appendix = dom.createElement('d-appendix');\n dom.body.appendChild(appendix);\n }\n\n let footnoteList = dom.querySelector('d-footnote-list');\n if (!footnoteList) {\n footnoteList = dom.createElement('d-footnote-list');\n appendix.appendChild(footnoteList);\n }\n\n let citationList = dom.querySelector('d-citation-list');\n if (!citationList) {\n citationList = dom.createElement('d-citation-list');\n appendix.appendChild(citationList);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const frontMatter = new FrontMatter();\n\n const Controller = {\n frontMatter: frontMatter,\n waitingOn: {\n bibliography: [],\n citations: []\n },\n listeners: {\n onCiteKeyCreated(event) {\n const [citeTag, keys] = event.detail;\n\n // ensure we have citations\n if (!frontMatter.citationsCollected) {\n // console.debug('onCiteKeyCreated, but unresolved dependency (\"citations\"). Enqueing.');\n Controller.waitingOn.citations.push(() =>\n Controller.listeners.onCiteKeyCreated(event)\n );\n return;\n }\n\n // ensure we have a loaded bibliography\n if (!frontMatter.bibliographyParsed) {\n // console.debug('onCiteKeyCreated, but unresolved dependency (\"bibliography\"). Enqueing.');\n Controller.waitingOn.bibliography.push(() =>\n Controller.listeners.onCiteKeyCreated(event)\n );\n return;\n }\n\n const numbers = keys.map(key => frontMatter.citations.indexOf(key));\n citeTag.numbers = numbers;\n const entries = keys.map(key => frontMatter.bibliography.get(key));\n citeTag.entries = entries;\n },\n\n onCiteKeyChanged() {\n // const [citeTag, keys] = event.detail;\n\n // update citations\n frontMatter.citations = collect_citations();\n frontMatter.citationsCollected = true;\n for (const waitingCallback of Controller.waitingOn.citations.slice()) {\n waitingCallback();\n }\n\n // update bibliography\n const citationListTag = document.querySelector(\"d-citation-list\");\n const bibliographyEntries = new Map(\n frontMatter.citations.map(citationKey => {\n return [citationKey, frontMatter.bibliography.get(citationKey)];\n })\n );\n citationListTag.citations = bibliographyEntries;\n\n const citeTags = document.querySelectorAll(\"d-cite\");\n for (const citeTag of citeTags) {\n console.log(citeTag);\n const keys = citeTag.keys;\n const numbers = keys.map(key => frontMatter.citations.indexOf(key));\n citeTag.numbers = numbers;\n const entries = keys.map(key => frontMatter.bibliography.get(key));\n citeTag.entries = entries;\n }\n },\n\n onCiteKeyRemoved(event) {\n Controller.listeners.onCiteKeyChanged(event);\n },\n\n onBibliographyChanged(event) {\n const citationListTag = document.querySelector(\"d-citation-list\");\n\n const bibliography = event.detail;\n\n frontMatter.bibliography = bibliography;\n frontMatter.bibliographyParsed = true;\n for (const waitingCallback of Controller.waitingOn.bibliography.slice()) {\n waitingCallback();\n }\n\n // ensure we have citations\n if (!frontMatter.citationsCollected) {\n Controller.waitingOn.citations.push(function() {\n Controller.listeners.onBibliographyChanged({\n target: event.target,\n detail: event.detail\n });\n });\n return;\n }\n\n if (citationListTag.hasAttribute(\"distill-prerendered\")) {\n console.debug(\"Citation list was prerendered; not updating it.\");\n } else {\n const entries = new Map(\n frontMatter.citations.map(citationKey => {\n return [citationKey, frontMatter.bibliography.get(citationKey)];\n })\n );\n citationListTag.citations = entries;\n }\n },\n\n onFootnoteChanged() {\n // const footnote = event.detail;\n //TODO: optimize to only update current footnote\n const footnotesList = document.querySelector(\"d-footnote-list\");\n if (footnotesList) {\n const footnotes = document.querySelectorAll(\"d-footnote\");\n footnotesList.footnotes = footnotes;\n }\n },\n\n onFrontMatterChanged(event) {\n const data = event.detail;\n mergeFromYMLFrontmatter(frontMatter, data);\n\n const interstitial = document.querySelector(\"d-interstitial\");\n if (interstitial) {\n if (typeof frontMatter.password !== \"undefined\") {\n interstitial.password = frontMatter.password;\n } else {\n interstitial.parentElement.removeChild(interstitial);\n }\n }\n\n const prerendered = document.body.hasAttribute(\"distill-prerendered\");\n if (!prerendered && domContentLoaded()) {\n optionalComponents(document, frontMatter);\n\n const appendix = document.querySelector(\"distill-appendix\");\n if (appendix) {\n appendix.frontMatter = frontMatter;\n }\n\n const byline = document.querySelector(\"d-byline\");\n if (byline) {\n byline.frontMatter = frontMatter;\n }\n\n if (data.katex) {\n DMath.katexOptions = data.katex;\n }\n }\n },\n\n DOMContentLoaded() {\n if (Controller.loaded) {\n console.warn(\n \"Controller received DOMContentLoaded but was already loaded!\"\n );\n return;\n } else if (!domContentLoaded()) {\n console.warn(\n \"Controller received DOMContentLoaded at document.readyState: \" +\n document.readyState +\n \"!\"\n );\n return;\n } else {\n Controller.loaded = true;\n console.debug(\"Runlevel 4: Controller running DOMContentLoaded\");\n }\n\n const frontMatterTag = document.querySelector(\"d-front-matter\");\n if (frontMatterTag) {\n const data = parseFrontmatter(frontMatterTag);\n Controller.listeners.onFrontMatterChanged({ detail: data });\n }\n\n // Resolving \"citations\" dependency due to initial DOM load\n frontMatter.citations = collect_citations();\n frontMatter.citationsCollected = true;\n for (const waitingCallback of Controller.waitingOn.citations.slice()) {\n waitingCallback();\n }\n\n if (frontMatter.bibliographyParsed) {\n for (const waitingCallback of Controller.waitingOn.bibliography.slice()) {\n waitingCallback();\n }\n }\n\n const footnotesList = document.querySelector(\"d-footnote-list\");\n if (footnotesList) {\n const footnotes = document.querySelectorAll(\"d-footnote\");\n footnotesList.footnotes = footnotes;\n }\n }\n } // listeners\n }; // Controller\n\n var base = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nhtml {\\n font-size: 14px;\\n\\tline-height: 1.6em;\\n /* font-family: \\\"Libre Franklin\\\", \\\"Helvetica Neue\\\", sans-serif; */\\n font-family: -apple-system, BlinkMacSystemFont, \\\"Segoe UI\\\", Roboto, Oxygen, Ubuntu, Cantarell, \\\"Fira Sans\\\", \\\"Droid Sans\\\", \\\"Helvetica Neue\\\", Arial, sans-serif;\\n /*, \\\"Apple Color Emoji\\\", \\\"Segoe UI Emoji\\\", \\\"Segoe UI Symbol\\\";*/\\n text-size-adjust: 100%;\\n -ms-text-size-adjust: 100%;\\n -webkit-text-size-adjust: 100%;\\n}\\n\\n@media(min-width: 768px) {\\n html {\\n font-size: 16px;\\n }\\n}\\n\\nbody {\\n margin: 0;\\n}\\n\\na {\\n color: #004276;\\n}\\n\\nfigure {\\n margin: 0;\\n}\\n\\ntable {\\n\\tborder-collapse: collapse;\\n\\tborder-spacing: 0;\\n}\\n\\ntable th {\\n\\ttext-align: left;\\n}\\n\\ntable thead {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.05);\\n}\\n\\ntable thead th {\\n padding-bottom: 0.5em;\\n}\\n\\ntable tbody :first-child td {\\n padding-top: 0.5em;\\n}\\n\\npre {\\n overflow: auto;\\n max-width: 100%;\\n}\\n\\np {\\n margin-top: 0;\\n margin-bottom: 1em;\\n}\\n\\nsup, sub {\\n vertical-align: baseline;\\n position: relative;\\n top: -0.4em;\\n line-height: 1em;\\n}\\n\\nsub {\\n top: 0.4em;\\n}\\n\\n.kicker,\\n.marker {\\n font-size: 15px;\\n font-weight: 600;\\n color: rgba(0, 0, 0, 0.5);\\n}\\n\\n\\n/* Headline */\\n\\n@media(min-width: 1024px) {\\n d-title h1 span {\\n display: block;\\n }\\n}\\n\\n/* Figure */\\n\\nfigure {\\n position: relative;\\n margin-bottom: 2.5em;\\n margin-top: 1.5em;\\n}\\n\\nfigcaption+figure {\\n\\n}\\n\\nfigure img {\\n width: 100%;\\n}\\n\\nfigure svg text,\\nfigure svg tspan {\\n}\\n\\nfigcaption,\\n.figcaption {\\n color: rgba(0, 0, 0, 0.6);\\n font-size: 12px;\\n line-height: 1.5em;\\n}\\n\\n@media(min-width: 1024px) {\\nfigcaption,\\n.figcaption {\\n font-size: 13px;\\n }\\n}\\n\\nfigure.external img {\\n background: white;\\n border: 1px solid rgba(0, 0, 0, 0.1);\\n box-shadow: 0 1px 8px rgba(0, 0, 0, 0.1);\\n padding: 18px;\\n box-sizing: border-box;\\n}\\n\\nfigcaption a {\\n color: rgba(0, 0, 0, 0.6);\\n}\\n\\nfigcaption b,\\nfigcaption strong, {\\n font-weight: 600;\\n color: rgba(0, 0, 0, 1.0);\\n}\\n\";\n\n var layout = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\n@supports not (display: grid) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n display: block;\\n padding: 8px;\\n }\\n}\\n\\n.base-grid,\\ndistill-header,\\nd-title,\\nd-abstract,\\nd-article,\\nd-appendix,\\ndistill-appendix,\\nd-byline,\\nd-footnote-list,\\nd-citation-list,\\ndistill-footer {\\n display: grid;\\n justify-items: stretch;\\n grid-template-columns: [screen-start] 8px [page-start kicker-start text-start gutter-start middle-start] 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr [text-end page-end gutter-end kicker-end middle-end] 8px [screen-end];\\n grid-column-gap: 8px;\\n}\\n\\n.grid {\\n display: grid;\\n grid-column-gap: 8px;\\n}\\n\\n@media(min-width: 768px) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n grid-template-columns: [screen-start] 1fr [page-start kicker-start middle-start text-start] 45px 45px 45px 45px 45px 45px 45px 45px [ kicker-end text-end gutter-start] 45px [middle-end] 45px [page-end gutter-end] 1fr [screen-end];\\n grid-column-gap: 16px;\\n }\\n\\n .grid {\\n grid-column-gap: 16px;\\n }\\n}\\n\\n@media(min-width: 1000px) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n grid-template-columns: [screen-start] 1fr [page-start kicker-start] 50px [middle-start] 50px [text-start kicker-end] 50px 50px 50px 50px 50px 50px 50px 50px [text-end gutter-start] 50px [middle-end] 50px [page-end gutter-end] 1fr [screen-end];\\n grid-column-gap: 16px;\\n }\\n\\n .grid {\\n grid-column-gap: 16px;\\n }\\n}\\n\\n@media(min-width: 1180px) {\\n .base-grid,\\n distill-header,\\n d-title,\\n d-abstract,\\n d-article,\\n d-appendix,\\n distill-appendix,\\n d-byline,\\n d-footnote-list,\\n d-citation-list,\\n distill-footer {\\n grid-template-columns: [screen-start] 1fr [page-start kicker-start] 60px [middle-start] 60px [text-start kicker-end] 60px 60px 60px 60px 60px 60px 60px 60px [text-end gutter-start] 60px [middle-end] 60px [page-end gutter-end] 1fr [screen-end];\\n grid-column-gap: 32px;\\n }\\n\\n .grid {\\n grid-column-gap: 32px;\\n }\\n}\\n\\n\\n\\n\\n.base-grid {\\n grid-column: screen;\\n}\\n\\n/* .l-body,\\nd-article > * {\\n grid-column: text;\\n}\\n\\n.l-page,\\nd-title > *,\\nd-figure {\\n grid-column: page;\\n} */\\n\\n.l-gutter {\\n grid-column: gutter;\\n}\\n\\n.l-text,\\n.l-body {\\n grid-column: text;\\n}\\n\\n.l-page {\\n grid-column: page;\\n}\\n\\n.l-body-outset {\\n grid-column: middle;\\n}\\n\\n.l-page-outset {\\n grid-column: page;\\n}\\n\\n.l-screen {\\n grid-column: screen;\\n}\\n\\n.l-screen-inset {\\n grid-column: screen;\\n padding-left: 16px;\\n padding-left: 16px;\\n}\\n\\n\\n/* Aside */\\n\\nd-article aside {\\n grid-column: gutter;\\n font-size: 12px;\\n line-height: 1.6em;\\n color: rgba(0, 0, 0, 0.6)\\n}\\n\\n@media(min-width: 768px) {\\n aside {\\n grid-column: gutter;\\n }\\n\\n .side {\\n grid-column: gutter;\\n }\\n}\\n\";\n\n var print = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\n@media print {\\n\\n @page {\\n size: 8in 11in;\\n @bottom-right {\\n content: counter(page) \\\" of \\\" counter(pages);\\n }\\n }\\n\\n html {\\n /* no general margins -- CSS Grid takes care of those */\\n }\\n\\n p, code {\\n page-break-inside: avoid;\\n }\\n\\n h2, h3 {\\n page-break-after: avoid;\\n }\\n\\n d-header {\\n visibility: hidden;\\n }\\n\\n d-footer {\\n display: none!important;\\n }\\n\\n}\\n\";\n\n var byline = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nd-byline {\\n contain: style;\\n overflow: hidden;\\n border-top: 1px solid rgba(0, 0, 0, 0.1);\\n font-size: 0.8rem;\\n line-height: 1.8em;\\n padding: 1.5rem 0;\\n min-height: 1.8em;\\n}\\n\\n\\nd-byline .byline {\\n grid-template-columns: 1fr 1fr;\\n grid-column: text;\\n}\\n\\n@media(min-width: 768px) {\\n d-byline .byline {\\n grid-template-columns: 1fr 1fr 1fr 1fr;\\n }\\n}\\n\\nd-byline .authors-affiliations {\\n grid-column-end: span 2;\\n grid-template-columns: 1fr 1fr;\\n margin-bottom: 1em;\\n}\\n\\n@media(min-width: 768px) {\\n d-byline .authors-affiliations {\\n margin-bottom: 0;\\n }\\n}\\n\\nd-byline h3 {\\n font-size: 0.6rem;\\n font-weight: 400;\\n color: rgba(0, 0, 0, 0.5);\\n margin: 0;\\n text-transform: uppercase;\\n}\\n\\nd-byline p {\\n margin: 0;\\n}\\n\\nd-byline a,\\nd-article d-byline a {\\n color: rgba(0, 0, 0, 0.8);\\n text-decoration: none;\\n border-bottom: none;\\n}\\n\\nd-article d-byline a:hover {\\n text-decoration: underline;\\n border-bottom: none;\\n}\\n\\nd-byline p.author {\\n font-weight: 500;\\n}\\n\\nd-byline .affiliations {\\n\\n}\\n\";\n\n var article = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nd-article {\\n contain: layout style;\\n overflow-x: hidden;\\n border-top: 1px solid rgba(0, 0, 0, 0.1);\\n padding-top: 2rem;\\n color: rgba(0, 0, 0, 0.8);\\n}\\n\\nd-article > * {\\n grid-column: text;\\n}\\n\\n@media(min-width: 768px) {\\n d-article {\\n font-size: 16px;\\n }\\n}\\n\\n@media(min-width: 1024px) {\\n d-article {\\n font-size: 1.06rem;\\n line-height: 1.7em;\\n }\\n}\\n\\n\\n/* H2 */\\n\\n\\nd-article .marker {\\n text-decoration: none;\\n border: none;\\n counter-reset: section;\\n grid-column: kicker;\\n line-height: 1.7em;\\n}\\n\\nd-article .marker:hover {\\n border: none;\\n}\\n\\nd-article .marker span {\\n padding: 0 3px 4px;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.2);\\n position: relative;\\n top: 4px;\\n}\\n\\nd-article .marker:hover span {\\n color: rgba(0, 0, 0, 0.7);\\n border-bottom: 1px solid rgba(0, 0, 0, 0.7);\\n}\\n\\nd-article h2 {\\n font-weight: 600;\\n font-size: 24px;\\n line-height: 1.25em;\\n margin: 2rem 0 1.5rem 0;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.1);\\n padding-bottom: 1rem;\\n}\\n\\n@media(min-width: 1024px) {\\n d-article h2 {\\n font-size: 36px;\\n }\\n}\\n\\n/* H3 */\\n\\nd-article h3 {\\n font-weight: 700;\\n font-size: 18px;\\n line-height: 1.4em;\\n margin-bottom: 1em;\\n margin-top: 2em;\\n}\\n\\n@media(min-width: 1024px) {\\n d-article h3 {\\n font-size: 20px;\\n }\\n}\\n\\n/* H4 */\\n\\nd-article h4 {\\n font-weight: 600;\\n text-transform: uppercase;\\n font-size: 14px;\\n line-height: 1.4em;\\n}\\n\\nd-article a {\\n color: inherit;\\n}\\n\\nd-article p,\\nd-article ul,\\nd-article ol,\\nd-article blockquote {\\n margin-top: 0;\\n margin-bottom: 1em;\\n margin-left: 0;\\n margin-right: 0;\\n}\\n\\nd-article blockquote {\\n border-left: 2px solid rgba(0, 0, 0, 0.2);\\n padding-left: 2em;\\n font-style: italic;\\n color: rgba(0, 0, 0, 0.6);\\n}\\n\\nd-article a {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.4);\\n text-decoration: none;\\n}\\n\\nd-article a:hover {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.8);\\n}\\n\\nd-article .link {\\n text-decoration: underline;\\n cursor: pointer;\\n}\\n\\nd-article ul,\\nd-article ol {\\n padding-left: 24px;\\n}\\n\\nd-article li {\\n margin-bottom: 1em;\\n margin-left: 0;\\n padding-left: 0;\\n}\\n\\nd-article li:last-child {\\n margin-bottom: 0;\\n}\\n\\nd-article pre {\\n font-size: 14px;\\n margin-bottom: 20px;\\n}\\n\\nd-article hr {\\n grid-column: screen;\\n width: 100%;\\n border: none;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.1);\\n margin-top: 60px;\\n margin-bottom: 60px;\\n}\\n\\nd-article section {\\n margin-top: 60px;\\n margin-bottom: 60px;\\n}\\n\\nd-article span.equation-mimic {\\n font-family: georgia;\\n font-size: 115%;\\n font-style: italic;\\n}\\n\\nd-article > d-code,\\nd-article section > d-code {\\n display: block;\\n}\\n\\nd-article > d-math[block],\\nd-article section > d-math[block] {\\n display: block;\\n}\\n\\n@media (max-width: 768px) {\\n d-article > d-code,\\n d-article section > d-code,\\n d-article > d-math[block],\\n d-article section > d-math[block] {\\n overflow-x: scroll;\\n -ms-overflow-style: none; // IE 10+\\n overflow: -moz-scrollbars-none; // Firefox\\n }\\n\\n d-article > d-code::-webkit-scrollbar,\\n d-article section > d-code::-webkit-scrollbar,\\n d-article > d-math[block]::-webkit-scrollbar,\\n d-article section > d-math[block]::-webkit-scrollbar {\\n display: none; // Safari and Chrome\\n }\\n}\\n\\nd-article .citation {\\n color: #668;\\n cursor: pointer;\\n}\\n\\nd-include {\\n width: auto;\\n display: block;\\n}\\n\\nd-figure {\\n contain: layout style;\\n}\\n\\n/* KaTeX */\\n\\n.katex, .katex-prerendered {\\n contain: style;\\n display: inline-block;\\n}\\n\\n/* Tables */\\n\\nd-article table {\\n border-collapse: collapse;\\n margin-bottom: 1.5rem;\\n border-bottom: 1px solid rgba(0, 0, 0, 0.2);\\n}\\n\\nd-article table th {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.2);\\n}\\n\\nd-article table td {\\n border-bottom: 1px solid rgba(0, 0, 0, 0.05);\\n}\\n\\nd-article table tr:last-of-type td {\\n border-bottom: none;\\n}\\n\\nd-article table th,\\nd-article table td {\\n font-size: 15px;\\n padding: 2px 8px;\\n}\\n\\nd-article table tbody :first-child td {\\n padding-top: 2px;\\n}\\n\";\n\n var title = \"/*\\n * Copyright 2018 The Distill Template Authors\\n *\\n * Licensed under the Apache License, Version 2.0 (the \\\"License\\\");\\n * you may not use this file except in compliance with the License.\\n * You may obtain a copy of the License at\\n *\\n * http://www.apache.org/licenses/LICENSE-2.0\\n *\\n * Unless required by applicable law or agreed to in writing, software\\n * distributed under the License is distributed on an \\\"AS IS\\\" BASIS,\\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\\n * See the License for the specific language governing permissions and\\n * limitations under the License.\\n */\\n\\nd-title {\\n padding: 2rem 0 1.5rem;\\n contain: layout style;\\n overflow-x: hidden;\\n}\\n\\n@media(min-width: 768px) {\\n d-title {\\n padding: 4rem 0 1.5rem;\\n }\\n}\\n\\nd-title h1 {\\n grid-column: text;\\n font-size: 40px;\\n font-weight: 700;\\n line-height: 1.1em;\\n margin: 0 0 0.5rem;\\n}\\n\\n@media(min-width: 768px) {\\n d-title h1 {\\n font-size: 50px;\\n }\\n}\\n\\nd-title p {\\n font-weight: 300;\\n font-size: 1.2rem;\\n line-height: 1.55em;\\n grid-column: text;\\n}\\n\\nd-title .status {\\n margin-top: 0px;\\n font-size: 12px;\\n color: #009688;\\n opacity: 0.8;\\n grid-column: kicker;\\n}\\n\\nd-title .status span {\\n line-height: 1;\\n display: inline-block;\\n padding: 6px 0;\\n border-bottom: 1px solid #80cbc4;\\n font-size: 11px;\\n text-transform: uppercase;\\n}\\n\";\n\n // Copyright 2018 The Distill Template Authors\n\n const styles = base + layout + title + byline + article + math + print;\n\n function makeStyleTag(dom) {\n\n const styleTagId = 'distill-prerendered-styles';\n const prerenderedTag = dom.getElementById(styleTagId);\n if (!prerenderedTag) {\n const styleTag = dom.createElement('style');\n styleTag.id = styleTagId;\n styleTag.type = 'text/css';\n const cssTextTag = dom.createTextNode(styles);\n styleTag.appendChild(cssTextTag);\n const firstScriptTag = dom.head.querySelector('script');\n dom.head.insertBefore(styleTag, firstScriptTag);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n function addPolyfill(polyfill, polyfillLoadedCallback) {\n console.debug('Runlevel 0: Polyfill required: ' + polyfill.name);\n const script = document.createElement('script');\n script.src = polyfill.url;\n script.async = false;\n if (polyfillLoadedCallback) {\n script.onload = function() { polyfillLoadedCallback(polyfill); };\n }\n script.onerror = function() {\n new Error('Runlevel 0: Polyfills failed to load script ' + polyfill.name);\n };\n document.head.appendChild(script);\n }\n\n const polyfills = [\n {\n name: 'WebComponents',\n support: function() {\n return 'customElements' in window &&\n 'attachShadow' in Element.prototype &&\n 'getRootNode' in Element.prototype &&\n 'content' in document.createElement('template') &&\n 'Promise' in window &&\n 'from' in Array;\n },\n url: 'https://distill.pub/third-party/polyfills/webcomponents-lite.js'\n }, {\n name: 'IntersectionObserver',\n support: function() {\n return 'IntersectionObserver' in window &&\n 'IntersectionObserverEntry' in window;\n },\n url: 'https://distill.pub/third-party/polyfills/intersection-observer.js'\n },\n ];\n\n class Polyfills {\n\n static browserSupportsAllFeatures() {\n return polyfills.every((poly) => poly.support());\n }\n\n static load(callback) {\n // Define an intermediate callback that checks if all is loaded.\n const polyfillLoaded = function(polyfill) {\n polyfill.loaded = true;\n console.debug('Runlevel 0: Polyfill has finished loading: ' + polyfill.name);\n // console.debug(window[polyfill.name]);\n if (Polyfills.neededPolyfills.every((poly) => poly.loaded)) {\n console.debug('Runlevel 0: All required polyfills have finished loading.');\n console.debug('Runlevel 0->1.');\n window.distillRunlevel = 1;\n callback();\n }\n };\n // Add polyfill script tags\n for (const polyfill of Polyfills.neededPolyfills) {\n addPolyfill(polyfill, polyfillLoaded);\n }\n }\n\n static get neededPolyfills() {\n if (!Polyfills._neededPolyfills) {\n Polyfills._neededPolyfills = polyfills.filter((poly) => !poly.support());\n }\n return Polyfills._neededPolyfills;\n }\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // const marginSmall = 16;\n // const marginLarge = 3 * marginSmall;\n // const margin = marginSmall + marginLarge;\n // const gutter = marginSmall;\n // const outsetAmount = margin / 2;\n // const numCols = 4;\n // const numGutters = numCols - 1;\n // const columnWidth = (768 - 2 * marginLarge - numGutters * gutter) / numCols;\n //\n // const screenwidth = 768;\n // const pageWidth = screenwidth - 2 * marginLarge;\n // const bodyWidth = pageWidth - columnWidth - gutter;\n\n function body(selector) {\n return `${selector} {\n grid-column: left / text;\n }\n `;\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$1 = Template('d-abstract', `\n\n\n\n`);\n\n class Abstract extends T$1(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$2 = Template('d-appendix', `\n\n\n`, false);\n\n class Appendix extends T$2(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // import { Template } from '../mixins/template';\n // import { Controller } from '../controller';\n\n const isOnlyWhitespace = /^\\s*$/;\n\n class Article extends HTMLElement {\n static get is() { return 'd-article'; }\n\n constructor() {\n super();\n\n new MutationObserver( (mutations) => {\n for (const mutation of mutations) {\n for (const addedNode of mutation.addedNodes) {\n switch (addedNode.nodeName) {\n case '#text': { // usually text nodes are only linebreaks.\n const text = addedNode.nodeValue;\n if (!isOnlyWhitespace.test(text)) {\n console.warn('Use of unwrapped text in distill articles is discouraged as it breaks layout! Please wrap any text in a or

        tag. We found the following text: ' + text);\n const wrapper = document.createElement('span');\n wrapper.innerHTML = addedNode.nodeValue;\n addedNode.parentNode.insertBefore(wrapper, addedNode);\n addedNode.parentNode.removeChild(addedNode);\n }\n } break;\n }\n }\n }\n }).observe(this, {childList: true});\n }\n\n }\n\n var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};\n\n function createCommonjsModule(fn, module) {\n \treturn module = { exports: {} }, fn(module, module.exports), module.exports;\n }\n\n var bibtexParse = createCommonjsModule(function (module, exports) {\n /* start bibtexParse 0.0.22 */\n\n //Original work by Henrik Muehe (c) 2010\n //\n //CommonJS port by Mikola Lysenko 2013\n //\n //Port to Browser lib by ORCID / RCPETERS\n //\n //Issues:\n //no comment handling within strings\n //no string concatenation\n //no variable values yet\n //Grammar implemented here:\n //bibtex -> (string | preamble | comment | entry)*;\n //string -> '@STRING' '{' key_equals_value '}';\n //preamble -> '@PREAMBLE' '{' value '}';\n //comment -> '@COMMENT' '{' value '}';\n //entry -> '@' key '{' key ',' key_value_list '}';\n //key_value_list -> key_equals_value (',' key_equals_value)*;\n //key_equals_value -> key '=' value;\n //value -> value_quotes | value_braces | key;\n //value_quotes -> '\"' .*? '\"'; // not quite\n //value_braces -> '{' .*? '\"'; // not quite\n (function(exports) {\n\n function BibtexParser() {\n\n this.months = [\"jan\", \"feb\", \"mar\", \"apr\", \"may\", \"jun\", \"jul\", \"aug\", \"sep\", \"oct\", \"nov\", \"dec\"];\n this.notKey = [',','{','}',' ','='];\n this.pos = 0;\n this.input = \"\";\n this.entries = new Array();\n\n this.currentEntry = \"\";\n\n this.setInput = function(t) {\n this.input = t;\n };\n\n this.getEntries = function() {\n return this.entries;\n };\n\n this.isWhitespace = function(s) {\n return (s == ' ' || s == '\\r' || s == '\\t' || s == '\\n');\n };\n\n this.match = function(s, canCommentOut) {\n if (canCommentOut == undefined || canCommentOut == null)\n canCommentOut = true;\n this.skipWhitespace(canCommentOut);\n if (this.input.substring(this.pos, this.pos + s.length) == s) {\n this.pos += s.length;\n } else {\n throw \"Token mismatch, expected \" + s + \", found \"\n + this.input.substring(this.pos);\n } this.skipWhitespace(canCommentOut);\n };\n\n this.tryMatch = function(s, canCommentOut) {\n if (canCommentOut == undefined || canCommentOut == null)\n canCommentOut = true;\n this.skipWhitespace(canCommentOut);\n if (this.input.substring(this.pos, this.pos + s.length) == s) {\n return true;\n } else {\n return false;\n } };\n\n /* when search for a match all text can be ignored, not just white space */\n this.matchAt = function() {\n while (this.input.length > this.pos && this.input[this.pos] != '@') {\n this.pos++;\n }\n if (this.input[this.pos] == '@') {\n return true;\n } return false;\n };\n\n this.skipWhitespace = function(canCommentOut) {\n while (this.isWhitespace(this.input[this.pos])) {\n this.pos++;\n } if (this.input[this.pos] == \"%\" && canCommentOut == true) {\n while (this.input[this.pos] != \"\\n\") {\n this.pos++;\n } this.skipWhitespace(canCommentOut);\n } };\n\n this.value_braces = function() {\n var bracecount = 0;\n this.match(\"{\", false);\n var start = this.pos;\n var escaped = false;\n while (true) {\n if (!escaped) {\n if (this.input[this.pos] == '}') {\n if (bracecount > 0) {\n bracecount--;\n } else {\n var end = this.pos;\n this.match(\"}\", false);\n return this.input.substring(start, end);\n } } else if (this.input[this.pos] == '{') {\n bracecount++;\n } else if (this.pos >= this.input.length - 1) {\n throw \"Unterminated value\";\n } } if (this.input[this.pos] == '\\\\' && escaped == false)\n escaped = true;\n else\n escaped = false;\n this.pos++;\n } };\n\n this.value_comment = function() {\n var str = '';\n var brcktCnt = 0;\n while (!(this.tryMatch(\"}\", false) && brcktCnt == 0)) {\n str = str + this.input[this.pos];\n if (this.input[this.pos] == '{')\n brcktCnt++;\n if (this.input[this.pos] == '}')\n brcktCnt--;\n if (this.pos >= this.input.length - 1) {\n throw \"Unterminated value:\" + this.input.substring(start);\n } this.pos++;\n } return str;\n };\n\n this.value_quotes = function() {\n this.match('\"', false);\n var start = this.pos;\n var escaped = false;\n while (true) {\n if (!escaped) {\n if (this.input[this.pos] == '\"') {\n var end = this.pos;\n this.match('\"', false);\n return this.input.substring(start, end);\n } else if (this.pos >= this.input.length - 1) {\n throw \"Unterminated value:\" + this.input.substring(start);\n } }\n if (this.input[this.pos] == '\\\\' && escaped == false)\n escaped = true;\n else\n escaped = false;\n this.pos++;\n } };\n\n this.single_value = function() {\n var start = this.pos;\n if (this.tryMatch(\"{\")) {\n return this.value_braces();\n } else if (this.tryMatch('\"')) {\n return this.value_quotes();\n } else {\n var k = this.key();\n if (k.match(\"^[0-9]+$\"))\n return k;\n else if (this.months.indexOf(k.toLowerCase()) >= 0)\n return k.toLowerCase();\n else\n throw \"Value expected:\" + this.input.substring(start) + ' for key: ' + k;\n\n } };\n\n this.value = function() {\n var values = [];\n values.push(this.single_value());\n while (this.tryMatch(\"#\")) {\n this.match(\"#\");\n values.push(this.single_value());\n } return values.join(\"\");\n };\n\n this.key = function() {\n var start = this.pos;\n while (true) {\n if (this.pos >= this.input.length) {\n throw \"Runaway key\";\n } // а-яА-Я is Cyrillic\n //console.log(this.input[this.pos]);\n if (this.notKey.indexOf(this.input[this.pos]) >= 0) {\n return this.input.substring(start, this.pos);\n } else {\n this.pos++;\n\n } } };\n\n this.key_equals_value = function() {\n var key = this.key();\n if (this.tryMatch(\"=\")) {\n this.match(\"=\");\n var val = this.value();\n return [ key, val ];\n } else {\n throw \"... = value expected, equals sign missing:\"\n + this.input.substring(this.pos);\n } };\n\n this.key_value_list = function() {\n var kv = this.key_equals_value();\n this.currentEntry['entryTags'] = {};\n this.currentEntry['entryTags'][kv[0]] = kv[1];\n while (this.tryMatch(\",\")) {\n this.match(\",\");\n // fixes problems with commas at the end of a list\n if (this.tryMatch(\"}\")) {\n break;\n }\n kv = this.key_equals_value();\n this.currentEntry['entryTags'][kv[0]] = kv[1];\n } };\n\n this.entry_body = function(d) {\n this.currentEntry = {};\n this.currentEntry['citationKey'] = this.key();\n this.currentEntry['entryType'] = d.substring(1);\n this.match(\",\");\n this.key_value_list();\n this.entries.push(this.currentEntry);\n };\n\n this.directive = function() {\n this.match(\"@\");\n return \"@\" + this.key();\n };\n\n this.preamble = function() {\n this.currentEntry = {};\n this.currentEntry['entryType'] = 'PREAMBLE';\n this.currentEntry['entry'] = this.value_comment();\n this.entries.push(this.currentEntry);\n };\n\n this.comment = function() {\n this.currentEntry = {};\n this.currentEntry['entryType'] = 'COMMENT';\n this.currentEntry['entry'] = this.value_comment();\n this.entries.push(this.currentEntry);\n };\n\n this.entry = function(d) {\n this.entry_body(d);\n };\n\n this.bibtex = function() {\n while (this.matchAt()) {\n var d = this.directive();\n this.match(\"{\");\n if (d == \"@STRING\") {\n this.string();\n } else if (d == \"@PREAMBLE\") {\n this.preamble();\n } else if (d == \"@COMMENT\") {\n this.comment();\n } else {\n this.entry(d);\n }\n this.match(\"}\");\n } };\n }\n exports.toJSON = function(bibtex) {\n var b = new BibtexParser();\n b.setInput(bibtex);\n b.bibtex();\n return b.entries;\n };\n\n /* added during hackathon don't hate on me */\n exports.toBibtex = function(json) {\n var out = '';\n for ( var i in json) {\n out += \"@\" + json[i].entryType;\n out += '{';\n if (json[i].citationKey)\n out += json[i].citationKey + ', ';\n if (json[i].entry)\n out += json[i].entry ;\n if (json[i].entryTags) {\n var tags = '';\n for (var jdx in json[i].entryTags) {\n if (tags.length != 0)\n tags += ', ';\n tags += jdx + '= {' + json[i].entryTags[jdx] + '}';\n }\n out += tags;\n }\n out += '}\\n\\n';\n }\n return out;\n\n };\n\n })( exports);\n\n /* end bibtexParse */\n });\n\n // Copyright 2018 The Distill Template Authors\n\n function normalizeTag(string) {\n return string\n .replace(/[\\t\\n ]+/g, ' ')\n .replace(/{\\\\[\"^`.'acu~Hvs]( )?([a-zA-Z])}/g, (full, x, char) => char)\n .replace(/{\\\\([a-zA-Z])}/g, (full, char) => char);\n }\n\n function parseBibtex(bibtex) {\n const bibliography = new Map();\n const parsedEntries = bibtexParse.toJSON(bibtex);\n for (const entry of parsedEntries) {\n // normalize tags; note entryTags is an object, not Map\n for (const [key, value] of Object.entries(entry.entryTags)) {\n entry.entryTags[key.toLowerCase()] = normalizeTag(value);\n }\n entry.entryTags.type = entry.entryType;\n // add to bibliography\n bibliography.set(entry.citationKey, entry.entryTags);\n }\n return bibliography;\n }\n\n function serializeFrontmatterToBibtex(frontMatter) {\n return `@article{${frontMatter.slug},\n author = {${frontMatter.bibtexAuthors}},\n title = {${frontMatter.title}},\n journal = {${frontMatter.journal.title}},\n year = {${frontMatter.publishedYear}},\n note = {${frontMatter.url}},\n doi = {${frontMatter.doi}}\n}`;\n }\n\n // Copyright 2018 The Distill Template Authors\n\n class Bibliography extends HTMLElement {\n\n static get is() { return 'd-bibliography'; }\n\n constructor() {\n super();\n\n // set up mutation observer\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver( (entries) => {\n for (const entry of entries) {\n if (entry.target.nodeName === 'SCRIPT' || entry.type === 'characterData') {\n this.parseIfPossible();\n }\n }\n });\n observer.observe(this, options);\n }\n\n connectedCallback() {\n requestAnimationFrame(() => {\n this.parseIfPossible();\n });\n }\n\n parseIfPossible() {\n const scriptTag = this.querySelector('script');\n if (!scriptTag) return;\n if (scriptTag.type == 'text/bibtex') {\n const newBibtex = scriptTag.textContent;\n if (this.bibtex !== newBibtex) {\n this.bibtex = newBibtex;\n const bibliography = parseBibtex(this.bibtex);\n this.notify(bibliography);\n }\n } else if (scriptTag.type == 'text/json') {\n const bibliography = new Map(JSON.parse(scriptTag.textContent));\n this.notify(bibliography);\n } else {\n console.warn('Unsupported bibliography script tag type: ' + scriptTag.type);\n }\n }\n\n notify(bibliography) {\n const options = { detail: bibliography, bubbles: true };\n const event = new CustomEvent('onBibliographyChanged', options);\n this.dispatchEvent(event);\n }\n\n /* observe 'src' attribute */\n\n static get observedAttributes() {\n return ['src'];\n }\n\n receivedBibtex(event) {\n const bibliography = parseBibtex(event.target.response);\n this.notify(bibliography);\n }\n\n attributeChangedCallback(name, oldValue, newValue) {\n var oReq = new XMLHttpRequest();\n oReq.onload = (e) => this.receivedBibtex(e);\n oReq.onerror = () => console.warn(`Could not load Bibtex! (tried ${newValue})`);\n oReq.responseType = 'text';\n oReq.open('GET', newValue, true);\n oReq.send();\n }\n\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // import style from '../styles/d-byline.css';\n\n function bylineTemplate(frontMatter) {\n return `\n

        \n
        \n

        Authors

        \n
        \n ${frontMatter.authors.map((author, i) => `\n \n ${author.personalURL ? `\n ${author.name}` + (i + 1 < frontMatter.authors.length ? `,` : ``) + `` : `\n ${author.name}` + (i + 1 < frontMatter.authors.length ? `,` : ``) + ``}\n \n `).join('')}\n
        \n
        \n
        \n

        Affiliation

        \n \n
        \n
        \n

        Published

        \n
        May 31, 2024
        \n
        \n
        \n`;\n }\n\n class Byline extends HTMLElement {\n\n static get is() { return 'd-byline'; }\n\n set frontMatter(frontMatter) {\n this.innerHTML = bylineTemplate(frontMatter);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$3 = Template(\n \"d-cite\",\n `\n\n\n\n\n
        \n \n
        \n`\n );\n\n class Cite extends T$3(HTMLElement) {\n /* Lifecycle */\n constructor() {\n super();\n this._numbers = [];\n this._entries = [];\n }\n\n connectedCallback() {\n this.outerSpan = this.root.querySelector(\"#citation-\");\n this.innerSpan = this.root.querySelector(\".citation-number\");\n this.hoverBox = this.root.querySelector(\"d-hover-box\");\n window.customElements.whenDefined(\"d-hover-box\").then(() => {\n this.hoverBox.listen(this);\n });\n // in case this component got connected after values were set\n if (this.numbers) {\n this.displayNumbers(this.numbers);\n }\n if (this.entries) {\n this.displayEntries(this.entries);\n }\n }\n\n //TODO This causes an infinite loop on firefox with polyfills.\n // This is only needed for interactive editing so no priority.\n // disconnectedCallback() {\n // const options = { detail: [this, this.keys], bubbles: true };\n // const event = new CustomEvent('onCiteKeyRemoved', options);\n // document.dispatchEvent(event);\n // }\n\n /* observe 'key' attribute */\n\n static get observedAttributes() {\n return [\"key\", \"bibtex-key\"];\n }\n\n attributeChangedCallback(name, oldValue, newValue) {\n const eventName = oldValue ? \"onCiteKeyChanged\" : \"onCiteKeyCreated\";\n const keys = newValue.split(\",\").map(k => k.trim());\n const options = { detail: [this, keys], bubbles: true };\n const event = new CustomEvent(eventName, options);\n document.dispatchEvent(event);\n }\n\n set key(value) {\n this.setAttribute(\"key\", value);\n }\n\n get key() {\n return this.getAttribute(\"key\") || this.getAttribute(\"bibtex-key\");\n }\n\n get keys() {\n const result = this.key.split(\",\");\n console.log(result);\n return result;\n }\n\n /* Setters & Rendering */\n\n set numbers(numbers) {\n this._numbers = numbers;\n this.displayNumbers(numbers);\n }\n\n get numbers() {\n return this._numbers;\n }\n\n displayNumbers(numbers) {\n if (!this.innerSpan) return;\n const numberStrings = numbers.map(index => {\n return index == -1 ? \"?\" : index + 1 + \"\";\n });\n const textContent = \"[\" + numberStrings.join(\", \") + \"]\";\n this.innerSpan.textContent = textContent;\n }\n\n set entries(entries) {\n this._entries = entries;\n this.displayEntries(entries);\n }\n\n get entries() {\n return this._entries;\n }\n\n displayEntries(entries) {\n if (!this.hoverBox) return;\n this.hoverBox.innerHTML = `
          \n ${entries\n .map(hover_cite)\n .map(html => `
        • ${html}
          • `)\n .join(\"\\n\")}\n
        `;\n }\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const styles$1 = `\nd-citation-list {\n contain: style;\n}\n\nd-citation-list .references {\n grid-column: text;\n}\n\nd-citation-list .references .title {\n font-weight: 500;\n}\n`;\n\n function renderCitationList(element, entries, dom=document) {\n if (entries.size > 0) {\n element.style.display = '';\n let list = element.querySelector('.references');\n if (list) {\n list.innerHTML = '';\n } else {\n const stylesTag = dom.createElement('style');\n stylesTag.innerHTML = styles$1;\n element.appendChild(stylesTag);\n\n const heading = dom.createElement('h3');\n heading.id = 'references';\n heading.textContent = 'References';\n element.appendChild(heading);\n\n list = dom.createElement('ol');\n list.id = 'references-list';\n list.className = 'references';\n element.appendChild(list);\n }\n\n for (const [key, entry] of entries) {\n const listItem = dom.createElement('li');\n listItem.id = key;\n listItem.innerHTML = bibliography_cite(entry);\n list.appendChild(listItem);\n }\n } else {\n element.style.display = 'none';\n }\n }\n\n class CitationList extends HTMLElement {\n\n static get is() { return 'd-citation-list'; }\n\n connectedCallback() {\n if (!this.hasAttribute('distill-prerendered')) {\n this.style.display = 'none';\n }\n }\n\n set citations(citations) {\n renderCitationList(this, citations);\n }\n\n }\n\n var prism = createCommonjsModule(function (module) {\n /* **********************************************\n Begin prism-core.js\n ********************************************** */\n\n var _self = (typeof window !== 'undefined')\n \t? window // if in browser\n \t: (\n \t\t(typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)\n \t\t? self // if in worker\n \t\t: {} // if in node js\n \t);\n\n /**\n * Prism: Lightweight, robust, elegant syntax highlighting\n * MIT license http://www.opensource.org/licenses/mit-license.php/\n * @author Lea Verou http://lea.verou.me\n */\n\n var Prism = (function (_self){\n\n // Private helper vars\n var lang = /\\blang(?:uage)?-([\\w-]+)\\b/i;\n var uniqueId = 0;\n\n\n var _ = {\n \tmanual: _self.Prism && _self.Prism.manual,\n \tdisableWorkerMessageHandler: _self.Prism && _self.Prism.disableWorkerMessageHandler,\n \tutil: {\n \t\tencode: function encode(tokens) {\n \t\t\tif (tokens instanceof Token) {\n \t\t\t\treturn new Token(tokens.type, encode(tokens.content), tokens.alias);\n \t\t\t} else if (Array.isArray(tokens)) {\n \t\t\t\treturn tokens.map(encode);\n \t\t\t} else {\n \t\t\t\treturn tokens.replace(/&/g, '&').replace(/' + env.content + '';\n };\n\n /**\n * @param {string} text\n * @param {LinkedList} tokenList\n * @param {any} grammar\n * @param {LinkedListNode} startNode\n * @param {number} startPos\n * @param {boolean} [oneshot=false]\n * @param {string} [target]\n */\n function matchGrammar(text, tokenList, grammar, startNode, startPos, oneshot, target) {\n \tfor (var token in grammar) {\n \t\tif (!grammar.hasOwnProperty(token) || !grammar[token]) {\n \t\t\tcontinue;\n \t\t}\n\n \t\tvar patterns = grammar[token];\n \t\tpatterns = Array.isArray(patterns) ? patterns : [patterns];\n\n \t\tfor (var j = 0; j < patterns.length; ++j) {\n \t\t\tif (target && target == token + ',' + j) {\n \t\t\t\treturn;\n \t\t\t}\n\n \t\t\tvar pattern = patterns[j],\n \t\t\t\tinside = pattern.inside,\n \t\t\t\tlookbehind = !!pattern.lookbehind,\n \t\t\t\tgreedy = !!pattern.greedy,\n \t\t\t\tlookbehindLength = 0,\n \t\t\t\talias = pattern.alias;\n\n \t\t\tif (greedy && !pattern.pattern.global) {\n \t\t\t\t// Without the global flag, lastIndex won't work\n \t\t\t\tvar flags = pattern.pattern.toString().match(/[imsuy]*$/)[0];\n \t\t\t\tpattern.pattern = RegExp(pattern.pattern.source, flags + 'g');\n \t\t\t}\n\n \t\t\tpattern = pattern.pattern || pattern;\n\n \t\t\tfor ( // iterate the token list and keep track of the current token/string position\n \t\t\t\tvar currentNode = startNode.next, pos = startPos;\n \t\t\t\tcurrentNode !== tokenList.tail;\n \t\t\t\tpos += currentNode.value.length, currentNode = currentNode.next\n \t\t\t) {\n\n \t\t\t\tvar str = currentNode.value;\n\n \t\t\t\tif (tokenList.length > text.length) {\n \t\t\t\t\t// Something went terribly wrong, ABORT, ABORT!\n \t\t\t\t\treturn;\n \t\t\t\t}\n\n \t\t\t\tif (str instanceof Token) {\n \t\t\t\t\tcontinue;\n \t\t\t\t}\n\n \t\t\t\tvar removeCount = 1; // this is the to parameter of removeBetween\n\n \t\t\t\tif (greedy && currentNode != tokenList.tail.prev) {\n \t\t\t\t\tpattern.lastIndex = pos;\n \t\t\t\t\tvar match = pattern.exec(text);\n \t\t\t\t\tif (!match) {\n \t\t\t\t\t\tbreak;\n \t\t\t\t\t}\n\n \t\t\t\t\tvar from = match.index + (lookbehind && match[1] ? match[1].length : 0);\n \t\t\t\t\tvar to = match.index + match[0].length;\n \t\t\t\t\tvar p = pos;\n\n \t\t\t\t\t// find the node that contains the match\n \t\t\t\t\tp += currentNode.value.length;\n \t\t\t\t\twhile (from >= p) {\n \t\t\t\t\t\tcurrentNode = currentNode.next;\n \t\t\t\t\t\tp += currentNode.value.length;\n \t\t\t\t\t}\n \t\t\t\t\t// adjust pos (and p)\n \t\t\t\t\tp -= currentNode.value.length;\n \t\t\t\t\tpos = p;\n\n \t\t\t\t\t// the current node is a Token, then the match starts inside another Token, which is invalid\n \t\t\t\t\tif (currentNode.value instanceof Token) {\n \t\t\t\t\t\tcontinue;\n \t\t\t\t\t}\n\n \t\t\t\t\t// find the last node which is affected by this match\n \t\t\t\t\tfor (\n \t\t\t\t\t\tvar k = currentNode;\n \t\t\t\t\t\tk !== tokenList.tail && (p < to || (typeof k.value === 'string' && !k.prev.value.greedy));\n \t\t\t\t\t\tk = k.next\n \t\t\t\t\t) {\n \t\t\t\t\t\tremoveCount++;\n \t\t\t\t\t\tp += k.value.length;\n \t\t\t\t\t}\n \t\t\t\t\tremoveCount--;\n\n \t\t\t\t\t// replace with the new match\n \t\t\t\t\tstr = text.slice(pos, p);\n \t\t\t\t\tmatch.index -= pos;\n \t\t\t\t} else {\n \t\t\t\t\tpattern.lastIndex = 0;\n\n \t\t\t\t\tvar match = pattern.exec(str);\n \t\t\t\t}\n\n \t\t\t\tif (!match) {\n \t\t\t\t\tif (oneshot) {\n \t\t\t\t\t\tbreak;\n \t\t\t\t\t}\n\n \t\t\t\t\tcontinue;\n \t\t\t\t}\n\n \t\t\t\tif (lookbehind) {\n \t\t\t\t\tlookbehindLength = match[1] ? match[1].length : 0;\n \t\t\t\t}\n\n \t\t\t\tvar from = match.index + lookbehindLength,\n \t\t\t\t\tmatch = match[0].slice(lookbehindLength),\n \t\t\t\t\tto = from + match.length,\n \t\t\t\t\tbefore = str.slice(0, from),\n \t\t\t\t\tafter = str.slice(to);\n\n \t\t\t\tvar removeFrom = currentNode.prev;\n\n \t\t\t\tif (before) {\n \t\t\t\t\tremoveFrom = addAfter(tokenList, removeFrom, before);\n \t\t\t\t\tpos += before.length;\n \t\t\t\t}\n\n \t\t\t\tremoveRange(tokenList, removeFrom, removeCount);\n\n \t\t\t\tvar wrapped = new Token(token, inside ? _.tokenize(match, inside) : match, alias, match, greedy);\n \t\t\t\tcurrentNode = addAfter(tokenList, removeFrom, wrapped);\n\n \t\t\t\tif (after) {\n \t\t\t\t\taddAfter(tokenList, currentNode, after);\n \t\t\t\t}\n\n\n \t\t\t\tif (removeCount > 1)\n \t\t\t\t\tmatchGrammar(text, tokenList, grammar, currentNode.prev, pos, true, token + ',' + j);\n\n \t\t\t\tif (oneshot)\n \t\t\t\t\tbreak;\n \t\t\t}\n \t\t}\n \t}\n }\n\n /**\n * @typedef LinkedListNode\n * @property {T} value\n * @property {LinkedListNode | null} prev The previous node.\n * @property {LinkedListNode | null} next The next node.\n * @template T\n */\n\n /**\n * @template T\n */\n function LinkedList() {\n \t/** @type {LinkedListNode} */\n \tvar head = { value: null, prev: null, next: null };\n \t/** @type {LinkedListNode} */\n \tvar tail = { value: null, prev: head, next: null };\n \thead.next = tail;\n\n \t/** @type {LinkedListNode} */\n \tthis.head = head;\n \t/** @type {LinkedListNode} */\n \tthis.tail = tail;\n \tthis.length = 0;\n }\n\n /**\n * Adds a new node with the given value to the list.\n * @param {LinkedList} list\n * @param {LinkedListNode} node\n * @param {T} value\n * @returns {LinkedListNode} The added node.\n * @template T\n */\n function addAfter(list, node, value) {\n \t// assumes that node != list.tail && values.length >= 0\n \tvar next = node.next;\n\n \tvar newNode = { value: value, prev: node, next: next };\n \tnode.next = newNode;\n \tnext.prev = newNode;\n \tlist.length++;\n\n \treturn newNode;\n }\n /**\n * Removes `count` nodes after the given node. The given node will not be removed.\n * @param {LinkedList} list\n * @param {LinkedListNode} node\n * @param {number} count\n * @template T\n */\n function removeRange(list, node, count) {\n \tvar next = node.next;\n \tfor (var i = 0; i < count && next !== list.tail; i++) {\n \t\tnext = next.next;\n \t}\n \tnode.next = next;\n \tnext.prev = node;\n \tlist.length -= i;\n }\n /**\n * @param {LinkedList} list\n * @returns {T[]}\n * @template T\n */\n function toArray(list) {\n \tvar array = [];\n \tvar node = list.head.next;\n \twhile (node !== list.tail) {\n \t\tarray.push(node.value);\n \t\tnode = node.next;\n \t}\n \treturn array;\n }\n\n\n if (!_self.document) {\n \tif (!_self.addEventListener) {\n \t\t// in Node.js\n \t\treturn _;\n \t}\n\n \tif (!_.disableWorkerMessageHandler) {\n \t\t// In worker\n \t\t_self.addEventListener('message', function (evt) {\n \t\t\tvar message = JSON.parse(evt.data),\n \t\t\t\tlang = message.language,\n \t\t\t\tcode = message.code,\n \t\t\t\timmediateClose = message.immediateClose;\n\n \t\t\t_self.postMessage(_.highlight(code, _.languages[lang], lang));\n \t\t\tif (immediateClose) {\n \t\t\t\t_self.close();\n \t\t\t}\n \t\t}, false);\n \t}\n\n \treturn _;\n }\n\n //Get current script and highlight\n var script = _.util.currentScript();\n\n if (script) {\n \t_.filename = script.src;\n\n \tif (script.hasAttribute('data-manual')) {\n \t\t_.manual = true;\n \t}\n }\n\n function highlightAutomaticallyCallback() {\n \tif (!_.manual) {\n \t\t_.highlightAll();\n \t}\n }\n\n if (!_.manual) {\n \t// If the document state is \"loading\", then we'll use DOMContentLoaded.\n \t// If the document state is \"interactive\" and the prism.js script is deferred, then we'll also use the\n \t// DOMContentLoaded event because there might be some plugins or languages which have also been deferred and they\n \t// might take longer one animation frame to execute which can create a race condition where only some plugins have\n \t// been loaded when Prism.highlightAll() is executed, depending on how fast resources are loaded.\n \t// See https://github.com/PrismJS/prism/issues/2102\n \tvar readyState = document.readyState;\n \tif (readyState === 'loading' || readyState === 'interactive' && script && script.defer) {\n \t\tdocument.addEventListener('DOMContentLoaded', highlightAutomaticallyCallback);\n \t} else {\n \t\tif (window.requestAnimationFrame) {\n \t\t\twindow.requestAnimationFrame(highlightAutomaticallyCallback);\n \t\t} else {\n \t\t\twindow.setTimeout(highlightAutomaticallyCallback, 16);\n \t\t}\n \t}\n }\n\n return _;\n\n })(_self);\n\n if ( module.exports) {\n \tmodule.exports = Prism;\n }\n\n // hack for components to work correctly in node.js\n if (typeof commonjsGlobal !== 'undefined') {\n \tcommonjsGlobal.Prism = Prism;\n }\n\n\n /* **********************************************\n Begin prism-markup.js\n ********************************************** */\n\n Prism.languages.markup = {\n \t'comment': //,\n \t'prolog': /<\\?[\\s\\S]+?\\?>/,\n \t'doctype': {\n \t\tpattern: /\"'[\\]]|\"[^\"]*\"|'[^']*')+(?:\\[(?:(?!)*\\]\\s*)?>/i,\n \t\tgreedy: true\n \t},\n \t'cdata': //i,\n \t'tag': {\n \t\tpattern: /<\\/?(?!\\d)[^\\s>\\/=$<%]+(?:\\s(?:\\s*[^\\s>\\/=]+(?:\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s'\">=]+(?=[\\s>]))|(?=[\\s/>])))+)?\\s*\\/?>/i,\n \t\tgreedy: true,\n \t\tinside: {\n \t\t\t'tag': {\n \t\t\t\tpattern: /^<\\/?[^\\s>\\/]+/i,\n \t\t\t\tinside: {\n \t\t\t\t\t'punctuation': /^<\\/?/,\n \t\t\t\t\t'namespace': /^[^\\s>\\/:]+:/\n \t\t\t\t}\n \t\t\t},\n \t\t\t'attr-value': {\n \t\t\t\tpattern: /=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s'\">=]+)/i,\n \t\t\t\tinside: {\n \t\t\t\t\t'punctuation': [\n \t\t\t\t\t\t/^=/,\n \t\t\t\t\t\t{\n \t\t\t\t\t\t\tpattern: /^(\\s*)[\"']|[\"']$/,\n \t\t\t\t\t\t\tlookbehind: true\n \t\t\t\t\t\t}\n \t\t\t\t\t]\n \t\t\t\t}\n \t\t\t},\n \t\t\t'punctuation': /\\/?>/,\n \t\t\t'attr-name': {\n \t\t\t\tpattern: /[^\\s>\\/]+/,\n \t\t\t\tinside: {\n \t\t\t\t\t'namespace': /^[^\\s>\\/:]+:/\n \t\t\t\t}\n \t\t\t}\n\n \t\t}\n \t},\n \t'entity': /&#?[\\da-z]{1,8};/i\n };\n\n Prism.languages.markup['tag'].inside['attr-value'].inside['entity'] =\n \tPrism.languages.markup['entity'];\n\n // Plugin to make entity title show the real entity, idea by Roman Komarov\n Prism.hooks.add('wrap', function(env) {\n\n \tif (env.type === 'entity') {\n \t\tenv.attributes['title'] = env.content.replace(/&/, '&');\n \t}\n });\n\n Object.defineProperty(Prism.languages.markup.tag, 'addInlined', {\n \t/**\n \t * Adds an inlined language to markup.\n \t *\n \t * An example of an inlined language is CSS with `\n\n\n\n`);\n\n class Code extends Mutating(T$4(HTMLElement)) {\n\n renderContent() {\n\n // check if language can be highlighted\n this.languageName = this.getAttribute('language');\n if (!this.languageName) {\n console.warn('You need to provide a language attribute to your block to let us know how to highlight your code; e.g.:\\n zeros = np.zeros(shape).');\n return;\n }\n const language = prism.languages[this.languageName];\n if (language == undefined) {\n console.warn(`Distill does not yet support highlighting your code block in \"${this.languageName}'.`);\n return;\n }\n\n let content = this.textContent;\n const codeTag = this.shadowRoot.querySelector('#code-container');\n\n if (this.hasAttribute('block')) {\n // normalize the tab indents\n content = content.replace(/\\n/, '');\n const tabs = content.match(/\\s*/);\n content = content.replace(new RegExp('\\n' + tabs, 'g'), '\\n');\n content = content.trim();\n // wrap code block in pre tag if needed\n if (codeTag.parentNode instanceof ShadowRoot) {\n const preTag = document.createElement('pre');\n this.shadowRoot.removeChild(codeTag);\n preTag.appendChild(codeTag);\n this.shadowRoot.appendChild(preTag);\n }\n\n }\n\n codeTag.className = `language-${this.languageName}`;\n codeTag.innerHTML = prism.highlight(content, language);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$5 = Template('d-footnote', `\n\n\n\n
        \n \n
        \n        \n\n\n \n\n\n`);\n\n class Footnote extends T$5(HTMLElement) {\n\n constructor() {\n super();\n\n const options = {childList: true, characterData: true, subtree: true};\n const observer = new MutationObserver(this.notify);\n observer.observe(this, options);\n }\n\n notify() {\n const options = { detail: this, bubbles: true };\n const event = new CustomEvent('onFootnoteChanged', options);\n document.dispatchEvent(event);\n }\n\n connectedCallback() {\n // listen and notify about changes to slotted content\n // const slot = this.shadowRoot.querySelector('#slot');\n // console.warn(slot.textContent);\n // slot.addEventListener('slotchange', this.notify);\n this.hoverBox = this.root.querySelector('d-hover-box');\n window.customElements.whenDefined('d-hover-box').then(() => {\n this.hoverBox.listen(this);\n });\n // create numeric ID\n Footnote.currentFootnoteId += 1;\n const IdString = Footnote.currentFootnoteId.toString();\n this.root.host.id = 'd-footnote-' + IdString;\n\n // set up hidden hover box\n const id = 'dt-fn-hover-box-' + IdString;\n this.hoverBox.id = id;\n\n // set up visible footnote marker\n const span = this.root.querySelector('#fn-');\n span.setAttribute('id', 'fn-' + IdString);\n span.setAttribute('data-hover-ref', id);\n span.textContent = IdString;\n }\n\n }\n\n Footnote.currentFootnoteId = 0;\n\n // Copyright 2018 The Distill Template Authors\n\n const T$6 = Template('d-footnote-list', `\n\n\n

        Footnotes

        \n
          \n`, false);\n\n class FootnoteList extends T$6(HTMLElement) {\n\n connectedCallback() {\n super.connectedCallback();\n\n this.list = this.root.querySelector('ol');\n // footnotes list is initially hidden\n this.root.style.display = 'none';\n // look through document and register existing footnotes\n // Store.subscribeTo('footnotes', (footnote) => {\n // this.renderFootnote(footnote);\n // });\n }\n\n // TODO: could optimize this to accept individual footnotes?\n set footnotes(footnotes) {\n this.list.innerHTML = '';\n if (footnotes.length) {\n // ensure footnote list is visible\n this.root.style.display = '';\n\n for (const footnote of footnotes) {\n // construct and append list item to show footnote\n const listItem = document.createElement('li');\n listItem.id = footnote.id + '-listing';\n listItem.innerHTML = footnote.innerHTML;\n\n const backlink = document.createElement('a');\n backlink.setAttribute('class', 'footnote-backlink');\n backlink.setAttribute('target', '_self');\n backlink.textContent = '[↩]';\n backlink.href = '#' + footnote.id;\n\n listItem.appendChild(backlink);\n this.list.appendChild(listItem);\n }\n } else {\n // ensure footnote list is invisible\n this.root.style.display = 'none';\n }\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$7 = Template('d-hover-box', `\n\n\n
          \n
          \n \n
          \n
          \n`);\n\n class HoverBox extends T$7(HTMLElement) {\n\n constructor() {\n super();\n }\n\n connectedCallback() {\n\n }\n\n listen(element) {\n // console.log(element)\n this.bindDivEvents(this);\n this.bindTriggerEvents(element);\n // this.style.display = \"block\";\n }\n\n bindDivEvents(element) {\n // For mice, same behavior as hovering on links\n element.addEventListener('mouseover', () => {\n if (!this.visible) this.showAtNode(element);\n this.stopTimeout();\n });\n element.addEventListener('mouseout', () => {\n this.extendTimeout(500);\n });\n // Don't trigger body touchstart event when touching within box\n element.addEventListener('touchstart', (event) => {\n event.stopPropagation();\n }, {passive: true});\n // Close box when touching outside box\n document.body.addEventListener('touchstart', () => {\n this.hide();\n }, {passive: true});\n }\n\n bindTriggerEvents(node) {\n node.addEventListener('mouseover', () => {\n if (!this.visible) {\n this.showAtNode(node);\n }\n this.stopTimeout();\n });\n\n node.addEventListener('mouseout', () => {\n this.extendTimeout(300);\n });\n\n node.addEventListener('touchstart', (event) => {\n if (this.visible) {\n this.hide();\n } else {\n this.showAtNode(node);\n }\n // Don't trigger body touchstart event when touching link\n event.stopPropagation();\n }, {passive: true});\n }\n\n show(position) {\n this.visible = true;\n this.style.display = 'block';\n // 10px extra offset from element\n this.style.top = Math.round(position[1] + 10) + 'px';\n }\n\n showAtNode(node) {\n // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetTop\n const bbox = node.getBoundingClientRect();\n this.show([node.offsetLeft + bbox.width, node.offsetTop + bbox.height]);\n }\n\n hide() {\n this.visible = false;\n this.style.display = 'none';\n this.stopTimeout();\n }\n\n stopTimeout() {\n if (this.timeout) {\n clearTimeout(this.timeout);\n }\n }\n\n extendTimeout(time) {\n this.stopTimeout();\n this.timeout = setTimeout(() => {\n this.hide();\n }, time);\n }\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n class Title extends HTMLElement {\n static get is() { return 'd-title'; }\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$8 = Template('d-references', `\n\n`, false);\n\n class References extends T$8(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n class TOC extends HTMLElement {\n\n static get is() { return 'd-toc'; }\n\n connectedCallback() {\n if (!this.getAttribute('prerendered')) {\n window.onload = () => {\n const article = document.querySelector('d-article');\n const headings = article.querySelectorAll('h2, h3');\n renderTOC(this, headings);\n };\n }\n }\n\n }\n\n function renderTOC(element, headings) {\n\n let ToC =`\n \n \n

          Table of contents

          \n
            `;\n\n for (const el of headings) {\n // should element be included in TOC?\n const isInTitle = el.parentElement.tagName == 'D-TITLE';\n const isException = el.getAttribute('no-toc');\n if (isInTitle || isException) continue;\n // create TOC entry\n const title = el.textContent;\n const link = '#' + el.getAttribute('id');\n\n let newLine = '
          • ' + '' + title + '' + '
            • ';\n if (el.tagName == 'H3') {\n newLine = '
              ' + newLine + '
            ';\n } else {\n newLine += '
            ';\n }\n ToC += newLine;\n\n }\n\n ToC += '
          ';\n element.innerHTML = ToC;\n }\n\n // Copyright 2018 The Distill Template Authors\n //\n // Licensed under the Apache License, Version 2.0 (the \"License\");\n // you may not use this file except in compliance with the License.\n // You may obtain a copy of the License at\n //\n // http://www.apache.org/licenses/LICENSE-2.0\n //\n // Unless required by applicable law or agreed to in writing, software\n // distributed under the License is distributed on an \"AS IS\" BASIS,\n // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n // See the License for the specific language governing permissions and\n // limitations under the License.\n\n // Figure\n //\n // d-figure provides a state-machine of visibility events:\n //\n // scroll out of view\n // +----------------+\n // *do work here* | |\n // +----------------+ +-+---------+ +-v---------+\n // | ready +----> onscreen | | offscreen |\n // +----------------+ +---------^-+ +---------+-+\n // | |\n // +----------------+\n // scroll into view\n //\n\n class Figure extends HTMLElement {\n\n static get is() { return 'd-figure'; }\n\n static get readyQueue() {\n if (!Figure._readyQueue) {\n Figure._readyQueue = [];\n }\n return Figure._readyQueue;\n }\n\n static addToReadyQueue(figure) {\n if (Figure.readyQueue.indexOf(figure) === -1) {\n Figure.readyQueue.push(figure);\n Figure.runReadyQueue();\n }\n }\n\n static runReadyQueue() {\n // console.log(\"Checking to run readyQueue, length: \" + Figure.readyQueue.length + \", scrolling: \" + Figure.isScrolling);\n // if (Figure.isScrolling) return;\n // console.log(\"Running ready Queue\");\n const figure = Figure.readyQueue\n .sort((a,b) => a._seenOnScreen - b._seenOnScreen )\n .filter((figure) => !figure._ready)\n .pop();\n if (figure) {\n figure.ready();\n requestAnimationFrame(Figure.runReadyQueue);\n }\n\n }\n\n constructor() {\n super();\n // debugger\n this._ready = false;\n this._onscreen = false;\n this._offscreen = true;\n }\n\n connectedCallback() {\n this.loadsWhileScrolling = this.hasAttribute('loadsWhileScrolling');\n Figure.marginObserver.observe(this);\n Figure.directObserver.observe(this);\n }\n\n disconnectedCallback() {\n Figure.marginObserver.unobserve(this);\n Figure.directObserver.unobserve(this);\n }\n\n // We use two separate observers:\n // One with an extra 1000px margin to warn if the viewpoint gets close,\n // And one for the actual on/off screen events\n\n static get marginObserver() {\n if (!Figure._marginObserver) {\n // if (!('IntersectionObserver' in window)) {\n // throw new Error('no interscetionobbserver!');\n // }\n const viewportHeight = window.innerHeight;\n const margin = Math.floor(2 * viewportHeight);\n const options = {rootMargin: margin + 'px 0px ' + margin + 'px 0px', threshold: 0.01};\n const callback = Figure.didObserveMarginIntersection;\n const observer = new IntersectionObserver(callback, options);\n Figure._marginObserver = observer;\n }\n return Figure._marginObserver;\n }\n\n static didObserveMarginIntersection(entries) {\n for (const entry of entries) {\n const figure = entry.target;\n if (entry.isIntersecting && !figure._ready) {\n Figure.addToReadyQueue(figure);\n }\n }\n }\n\n static get directObserver() {\n if (!Figure._directObserver) {\n Figure._directObserver = new IntersectionObserver(\n Figure.didObserveDirectIntersection, {\n rootMargin: '0px', threshold: [0, 1.0],\n }\n );\n }\n return Figure._directObserver;\n }\n\n static didObserveDirectIntersection(entries) {\n for (const entry of entries) {\n const figure = entry.target;\n if (entry.isIntersecting) {\n figure._seenOnScreen = new Date();\n // if (!figure._ready) { figure.ready(); }\n if (figure._offscreen) { figure.onscreen(); }\n } else {\n if (figure._onscreen) { figure.offscreen(); }\n }\n }\n }\n\n // Notify listeners that registered late, too:\n\n addEventListener(eventName, callback) {\n super.addEventListener(eventName, callback);\n // if we had already dispatched something while presumingly no one was listening, we do so again\n // debugger\n if (eventName === 'ready') {\n if (Figure.readyQueue.indexOf(this) !== -1) {\n this._ready = false;\n Figure.runReadyQueue();\n }\n }\n if (eventName === 'onscreen') {\n this.onscreen();\n }\n }\n\n // Custom Events\n\n ready() {\n // debugger\n this._ready = true;\n Figure.marginObserver.unobserve(this);\n const event = new CustomEvent('ready');\n this.dispatchEvent(event);\n }\n\n onscreen() {\n this._onscreen = true;\n this._offscreen = false;\n const event = new CustomEvent('onscreen');\n this.dispatchEvent(event);\n }\n\n offscreen() {\n this._onscreen = false;\n this._offscreen = true;\n const event = new CustomEvent('offscreen');\n this.dispatchEvent(event);\n }\n\n }\n\n if (typeof window !== 'undefined') {\n\n Figure.isScrolling = false;\n let timeout;\n const resetTimer = () => {\n Figure.isScrolling = true;\n clearTimeout(timeout);\n timeout = setTimeout(() => {\n Figure.isScrolling = false;\n Figure.runReadyQueue();\n }, 500);\n };\n window.addEventListener('scroll', resetTimer, true);\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n // This overlay is not secure.\n // It is only meant as a social deterrent.\n\n const productionHostname = 'distill.pub';\n const T$9 = Template('d-interstitial', `\n\n\n
          \n
          \n

          This article is in review.

          \n

          Do not share this URL or the contents of this article. Thank you!

          \n \n

          Enter the password we shared with you as part of the review process to view the article.

          \n
          \n
          \n`);\n\n class Interstitial extends T$9(HTMLElement) {\n\n connectedCallback() {\n if (this.shouldRemoveSelf()) {\n this.parentElement.removeChild(this);\n } else {\n const passwordInput = this.root.querySelector('#interstitial-password-input');\n passwordInput.oninput = (event) => this.passwordChanged(event);\n }\n }\n\n passwordChanged(event) {\n const entered = event.target.value;\n if (entered === this.password) {\n console.log('Correct password entered.');\n this.parentElement.removeChild(this);\n if (typeof(Storage) !== 'undefined') {\n console.log('Saved that correct password was entered.');\n localStorage.setItem(this.localStorageIdentifier(), 'true');\n }\n }\n }\n\n shouldRemoveSelf() {\n // should never be visible in production\n if (window && window.location.hostname === productionHostname) {\n console.warn('Interstitial found on production, hiding it.');\n return true\n }\n // should only have to enter password once\n if (typeof(Storage) !== 'undefined') {\n if (localStorage.getItem(this.localStorageIdentifier()) === 'true') {\n console.log('Loaded that correct password was entered before; skipping interstitial.');\n return true;\n }\n }\n // otherwise, leave visible\n return false;\n }\n\n localStorageIdentifier() {\n const prefix = 'distill-drafts';\n const suffix = 'interstitial-password-correct';\n return prefix + (window ? window.location.pathname : '-') + suffix\n }\n\n }\n\n function ascending(a, b) {\n return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;\n }\n\n function bisector(compare) {\n if (compare.length === 1) compare = ascendingComparator(compare);\n return {\n left: function(a, x, lo, hi) {\n if (lo == null) lo = 0;\n if (hi == null) hi = a.length;\n while (lo < hi) {\n var mid = lo + hi >>> 1;\n if (compare(a[mid], x) < 0) lo = mid + 1;\n else hi = mid;\n }\n return lo;\n },\n right: function(a, x, lo, hi) {\n if (lo == null) lo = 0;\n if (hi == null) hi = a.length;\n while (lo < hi) {\n var mid = lo + hi >>> 1;\n if (compare(a[mid], x) > 0) hi = mid;\n else lo = mid + 1;\n }\n return lo;\n }\n };\n }\n\n function ascendingComparator(f) {\n return function(d, x) {\n return ascending(f(d), x);\n };\n }\n\n var ascendingBisect = bisector(ascending);\n var bisectRight = ascendingBisect.right;\n\n function range(start, stop, step) {\n start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;\n\n var i = -1,\n n = Math.max(0, Math.ceil((stop - start) / step)) | 0,\n range = new Array(n);\n\n while (++i < n) {\n range[i] = start + i * step;\n }\n\n return range;\n }\n\n var e10 = Math.sqrt(50),\n e5 = Math.sqrt(10),\n e2 = Math.sqrt(2);\n\n function ticks(start, stop, count) {\n var reverse,\n i = -1,\n n,\n ticks,\n step;\n\n stop = +stop, start = +start, count = +count;\n if (start === stop && count > 0) return [start];\n if (reverse = stop < start) n = start, start = stop, stop = n;\n if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];\n\n if (step > 0) {\n start = Math.ceil(start / step);\n stop = Math.floor(stop / step);\n ticks = new Array(n = Math.ceil(stop - start + 1));\n while (++i < n) ticks[i] = (start + i) * step;\n } else {\n start = Math.floor(start * step);\n stop = Math.ceil(stop * step);\n ticks = new Array(n = Math.ceil(start - stop + 1));\n while (++i < n) ticks[i] = (start - i) / step;\n }\n\n if (reverse) ticks.reverse();\n\n return ticks;\n }\n\n function tickIncrement(start, stop, count) {\n var step = (stop - start) / Math.max(0, count),\n power = Math.floor(Math.log(step) / Math.LN10),\n error = step / Math.pow(10, power);\n return power >= 0\n ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)\n : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);\n }\n\n function tickStep(start, stop, count) {\n var step0 = Math.abs(stop - start) / Math.max(0, count),\n step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),\n error = step0 / step1;\n if (error >= e10) step1 *= 10;\n else if (error >= e5) step1 *= 5;\n else if (error >= e2) step1 *= 2;\n return stop < start ? -step1 : step1;\n }\n\n function initRange(domain, range) {\n switch (arguments.length) {\n case 0: break;\n case 1: this.range(domain); break;\n default: this.range(range).domain(domain); break;\n }\n return this;\n }\n\n function define(constructor, factory, prototype) {\n constructor.prototype = factory.prototype = prototype;\n prototype.constructor = constructor;\n }\n\n function extend(parent, definition) {\n var prototype = Object.create(parent.prototype);\n for (var key in definition) prototype[key] = definition[key];\n return prototype;\n }\n\n function Color() {}\n\n var darker = 0.7;\n var brighter = 1 / darker;\n\n var reI = \"\\\\s*([+-]?\\\\d+)\\\\s*\",\n reN = \"\\\\s*([+-]?\\\\d*\\\\.?\\\\d+(?:[eE][+-]?\\\\d+)?)\\\\s*\",\n reP = \"\\\\s*([+-]?\\\\d*\\\\.?\\\\d+(?:[eE][+-]?\\\\d+)?)%\\\\s*\",\n reHex = /^#([0-9a-f]{3,8})$/,\n reRgbInteger = new RegExp(\"^rgb\\\\(\" + [reI, reI, reI] + \"\\\\)$\"),\n reRgbPercent = new RegExp(\"^rgb\\\\(\" + [reP, reP, reP] + \"\\\\)$\"),\n reRgbaInteger = new RegExp(\"^rgba\\\\(\" + [reI, reI, reI, reN] + \"\\\\)$\"),\n reRgbaPercent = new RegExp(\"^rgba\\\\(\" + [reP, reP, reP, reN] + \"\\\\)$\"),\n reHslPercent = new RegExp(\"^hsl\\\\(\" + [reN, reP, reP] + \"\\\\)$\"),\n reHslaPercent = new RegExp(\"^hsla\\\\(\" + [reN, reP, reP, reN] + \"\\\\)$\");\n\n var named = {\n aliceblue: 0xf0f8ff,\n antiquewhite: 0xfaebd7,\n aqua: 0x00ffff,\n aquamarine: 0x7fffd4,\n azure: 0xf0ffff,\n beige: 0xf5f5dc,\n bisque: 0xffe4c4,\n black: 0x000000,\n blanchedalmond: 0xffebcd,\n blue: 0x0000ff,\n blueviolet: 0x8a2be2,\n brown: 0xa52a2a,\n burlywood: 0xdeb887,\n cadetblue: 0x5f9ea0,\n chartreuse: 0x7fff00,\n chocolate: 0xd2691e,\n coral: 0xff7f50,\n cornflowerblue: 0x6495ed,\n cornsilk: 0xfff8dc,\n crimson: 0xdc143c,\n cyan: 0x00ffff,\n darkblue: 0x00008b,\n darkcyan: 0x008b8b,\n darkgoldenrod: 0xb8860b,\n darkgray: 0xa9a9a9,\n darkgreen: 0x006400,\n darkgrey: 0xa9a9a9,\n darkkhaki: 0xbdb76b,\n darkmagenta: 0x8b008b,\n darkolivegreen: 0x556b2f,\n darkorange: 0xff8c00,\n darkorchid: 0x9932cc,\n darkred: 0x8b0000,\n darksalmon: 0xe9967a,\n darkseagreen: 0x8fbc8f,\n darkslateblue: 0x483d8b,\n darkslategray: 0x2f4f4f,\n darkslategrey: 0x2f4f4f,\n darkturquoise: 0x00ced1,\n darkviolet: 0x9400d3,\n deeppink: 0xff1493,\n deepskyblue: 0x00bfff,\n dimgray: 0x696969,\n dimgrey: 0x696969,\n dodgerblue: 0x1e90ff,\n firebrick: 0xb22222,\n floralwhite: 0xfffaf0,\n forestgreen: 0x228b22,\n fuchsia: 0xff00ff,\n gainsboro: 0xdcdcdc,\n ghostwhite: 0xf8f8ff,\n gold: 0xffd700,\n goldenrod: 0xdaa520,\n gray: 0x808080,\n green: 0x008000,\n greenyellow: 0xadff2f,\n grey: 0x808080,\n honeydew: 0xf0fff0,\n hotpink: 0xff69b4,\n indianred: 0xcd5c5c,\n indigo: 0x4b0082,\n ivory: 0xfffff0,\n khaki: 0xf0e68c,\n lavender: 0xe6e6fa,\n lavenderblush: 0xfff0f5,\n lawngreen: 0x7cfc00,\n lemonchiffon: 0xfffacd,\n lightblue: 0xadd8e6,\n lightcoral: 0xf08080,\n lightcyan: 0xe0ffff,\n lightgoldenrodyellow: 0xfafad2,\n lightgray: 0xd3d3d3,\n lightgreen: 0x90ee90,\n lightgrey: 0xd3d3d3,\n lightpink: 0xffb6c1,\n lightsalmon: 0xffa07a,\n lightseagreen: 0x20b2aa,\n lightskyblue: 0x87cefa,\n lightslategray: 0x778899,\n lightslategrey: 0x778899,\n lightsteelblue: 0xb0c4de,\n lightyellow: 0xffffe0,\n lime: 0x00ff00,\n limegreen: 0x32cd32,\n linen: 0xfaf0e6,\n magenta: 0xff00ff,\n maroon: 0x800000,\n mediumaquamarine: 0x66cdaa,\n mediumblue: 0x0000cd,\n mediumorchid: 0xba55d3,\n mediumpurple: 0x9370db,\n mediumseagreen: 0x3cb371,\n mediumslateblue: 0x7b68ee,\n mediumspringgreen: 0x00fa9a,\n mediumturquoise: 0x48d1cc,\n mediumvioletred: 0xc71585,\n midnightblue: 0x191970,\n mintcream: 0xf5fffa,\n mistyrose: 0xffe4e1,\n moccasin: 0xffe4b5,\n navajowhite: 0xffdead,\n navy: 0x000080,\n oldlace: 0xfdf5e6,\n olive: 0x808000,\n olivedrab: 0x6b8e23,\n orange: 0xffa500,\n orangered: 0xff4500,\n orchid: 0xda70d6,\n palegoldenrod: 0xeee8aa,\n palegreen: 0x98fb98,\n paleturquoise: 0xafeeee,\n palevioletred: 0xdb7093,\n papayawhip: 0xffefd5,\n peachpuff: 0xffdab9,\n peru: 0xcd853f,\n pink: 0xffc0cb,\n plum: 0xdda0dd,\n powderblue: 0xb0e0e6,\n purple: 0x800080,\n rebeccapurple: 0x663399,\n red: 0xff0000,\n rosybrown: 0xbc8f8f,\n royalblue: 0x4169e1,\n saddlebrown: 0x8b4513,\n salmon: 0xfa8072,\n sandybrown: 0xf4a460,\n seagreen: 0x2e8b57,\n seashell: 0xfff5ee,\n sienna: 0xa0522d,\n silver: 0xc0c0c0,\n skyblue: 0x87ceeb,\n slateblue: 0x6a5acd,\n slategray: 0x708090,\n slategrey: 0x708090,\n snow: 0xfffafa,\n springgreen: 0x00ff7f,\n steelblue: 0x4682b4,\n tan: 0xd2b48c,\n teal: 0x008080,\n thistle: 0xd8bfd8,\n tomato: 0xff6347,\n turquoise: 0x40e0d0,\n violet: 0xee82ee,\n wheat: 0xf5deb3,\n white: 0xffffff,\n whitesmoke: 0xf5f5f5,\n yellow: 0xffff00,\n yellowgreen: 0x9acd32\n };\n\n define(Color, color, {\n copy: function(channels) {\n return Object.assign(new this.constructor, this, channels);\n },\n displayable: function() {\n return this.rgb().displayable();\n },\n hex: color_formatHex, // Deprecated! Use color.formatHex.\n formatHex: color_formatHex,\n formatHsl: color_formatHsl,\n formatRgb: color_formatRgb,\n toString: color_formatRgb\n });\n\n function color_formatHex() {\n return this.rgb().formatHex();\n }\n\n function color_formatHsl() {\n return hslConvert(this).formatHsl();\n }\n\n function color_formatRgb() {\n return this.rgb().formatRgb();\n }\n\n function color(format) {\n var m, l;\n format = (format + \"\").trim().toLowerCase();\n return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000\n : l === 3 ? new Rgb((m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1) // #f00\n : l === 8 ? rgba(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000\n : l === 4 ? rgba((m >> 12 & 0xf) | (m >> 8 & 0xf0), (m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), (((m & 0xf) << 4) | (m & 0xf)) / 0xff) // #f000\n : null) // invalid hex\n : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)\n : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)\n : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)\n : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)\n : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)\n : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)\n : named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins\n : format === \"transparent\" ? new Rgb(NaN, NaN, NaN, 0)\n : null;\n }\n\n function rgbn(n) {\n return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);\n }\n\n function rgba(r, g, b, a) {\n if (a <= 0) r = g = b = NaN;\n return new Rgb(r, g, b, a);\n }\n\n function rgbConvert(o) {\n if (!(o instanceof Color)) o = color(o);\n if (!o) return new Rgb;\n o = o.rgb();\n return new Rgb(o.r, o.g, o.b, o.opacity);\n }\n\n function rgb(r, g, b, opacity) {\n return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);\n }\n\n function Rgb(r, g, b, opacity) {\n this.r = +r;\n this.g = +g;\n this.b = +b;\n this.opacity = +opacity;\n }\n\n define(Rgb, rgb, extend(Color, {\n brighter: function(k) {\n k = k == null ? brighter : Math.pow(brighter, k);\n return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);\n },\n darker: function(k) {\n k = k == null ? darker : Math.pow(darker, k);\n return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);\n },\n rgb: function() {\n return this;\n },\n displayable: function() {\n return (-0.5 <= this.r && this.r < 255.5)\n && (-0.5 <= this.g && this.g < 255.5)\n && (-0.5 <= this.b && this.b < 255.5)\n && (0 <= this.opacity && this.opacity <= 1);\n },\n hex: rgb_formatHex, // Deprecated! Use color.formatHex.\n formatHex: rgb_formatHex,\n formatRgb: rgb_formatRgb,\n toString: rgb_formatRgb\n }));\n\n function rgb_formatHex() {\n return \"#\" + hex(this.r) + hex(this.g) + hex(this.b);\n }\n\n function rgb_formatRgb() {\n var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));\n return (a === 1 ? \"rgb(\" : \"rgba(\")\n + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + \", \"\n + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + \", \"\n + Math.max(0, Math.min(255, Math.round(this.b) || 0))\n + (a === 1 ? \")\" : \", \" + a + \")\");\n }\n\n function hex(value) {\n value = Math.max(0, Math.min(255, Math.round(value) || 0));\n return (value < 16 ? \"0\" : \"\") + value.toString(16);\n }\n\n function hsla(h, s, l, a) {\n if (a <= 0) h = s = l = NaN;\n else if (l <= 0 || l >= 1) h = s = NaN;\n else if (s <= 0) h = NaN;\n return new Hsl(h, s, l, a);\n }\n\n function hslConvert(o) {\n if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);\n if (!(o instanceof Color)) o = color(o);\n if (!o) return new Hsl;\n if (o instanceof Hsl) return o;\n o = o.rgb();\n var r = o.r / 255,\n g = o.g / 255,\n b = o.b / 255,\n min = Math.min(r, g, b),\n max = Math.max(r, g, b),\n h = NaN,\n s = max - min,\n l = (max + min) / 2;\n if (s) {\n if (r === max) h = (g - b) / s + (g < b) * 6;\n else if (g === max) h = (b - r) / s + 2;\n else h = (r - g) / s + 4;\n s /= l < 0.5 ? max + min : 2 - max - min;\n h *= 60;\n } else {\n s = l > 0 && l < 1 ? 0 : h;\n }\n return new Hsl(h, s, l, o.opacity);\n }\n\n function hsl(h, s, l, opacity) {\n return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);\n }\n\n function Hsl(h, s, l, opacity) {\n this.h = +h;\n this.s = +s;\n this.l = +l;\n this.opacity = +opacity;\n }\n\n define(Hsl, hsl, extend(Color, {\n brighter: function(k) {\n k = k == null ? brighter : Math.pow(brighter, k);\n return new Hsl(this.h, this.s, this.l * k, this.opacity);\n },\n darker: function(k) {\n k = k == null ? darker : Math.pow(darker, k);\n return new Hsl(this.h, this.s, this.l * k, this.opacity);\n },\n rgb: function() {\n var h = this.h % 360 + (this.h < 0) * 360,\n s = isNaN(h) || isNaN(this.s) ? 0 : this.s,\n l = this.l,\n m2 = l + (l < 0.5 ? l : 1 - l) * s,\n m1 = 2 * l - m2;\n return new Rgb(\n hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),\n hsl2rgb(h, m1, m2),\n hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),\n this.opacity\n );\n },\n displayable: function() {\n return (0 <= this.s && this.s <= 1 || isNaN(this.s))\n && (0 <= this.l && this.l <= 1)\n && (0 <= this.opacity && this.opacity <= 1);\n },\n formatHsl: function() {\n var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));\n return (a === 1 ? \"hsl(\" : \"hsla(\")\n + (this.h || 0) + \", \"\n + (this.s || 0) * 100 + \"%, \"\n + (this.l || 0) * 100 + \"%\"\n + (a === 1 ? \")\" : \", \" + a + \")\");\n }\n }));\n\n /* From FvD 13.37, CSS Color Module Level 3 */\n function hsl2rgb(h, m1, m2) {\n return (h < 60 ? m1 + (m2 - m1) * h / 60\n : h < 180 ? m2\n : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60\n : m1) * 255;\n }\n\n var deg2rad = Math.PI / 180;\n var rad2deg = 180 / Math.PI;\n\n // https://observablehq.com/@mbostock/lab-and-rgb\n var K = 18,\n Xn = 0.96422,\n Yn = 1,\n Zn = 0.82521,\n t0 = 4 / 29,\n t1 = 6 / 29,\n t2 = 3 * t1 * t1,\n t3 = t1 * t1 * t1;\n\n function labConvert(o) {\n if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);\n if (o instanceof Hcl) return hcl2lab(o);\n if (!(o instanceof Rgb)) o = rgbConvert(o);\n var r = rgb2lrgb(o.r),\n g = rgb2lrgb(o.g),\n b = rgb2lrgb(o.b),\n y = xyz2lab((0.2225045 * r + 0.7168786 * g + 0.0606169 * b) / Yn), x, z;\n if (r === g && g === b) x = z = y; else {\n x = xyz2lab((0.4360747 * r + 0.3850649 * g + 0.1430804 * b) / Xn);\n z = xyz2lab((0.0139322 * r + 0.0971045 * g + 0.7141733 * b) / Zn);\n }\n return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);\n }\n\n function lab(l, a, b, opacity) {\n return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);\n }\n\n function Lab(l, a, b, opacity) {\n this.l = +l;\n this.a = +a;\n this.b = +b;\n this.opacity = +opacity;\n }\n\n define(Lab, lab, extend(Color, {\n brighter: function(k) {\n return new Lab(this.l + K * (k == null ? 1 : k), this.a, this.b, this.opacity);\n },\n darker: function(k) {\n return new Lab(this.l - K * (k == null ? 1 : k), this.a, this.b, this.opacity);\n },\n rgb: function() {\n var y = (this.l + 16) / 116,\n x = isNaN(this.a) ? y : y + this.a / 500,\n z = isNaN(this.b) ? y : y - this.b / 200;\n x = Xn * lab2xyz(x);\n y = Yn * lab2xyz(y);\n z = Zn * lab2xyz(z);\n return new Rgb(\n lrgb2rgb( 3.1338561 * x - 1.6168667 * y - 0.4906146 * z),\n lrgb2rgb(-0.9787684 * x + 1.9161415 * y + 0.0334540 * z),\n lrgb2rgb( 0.0719453 * x - 0.2289914 * y + 1.4052427 * z),\n this.opacity\n );\n }\n }));\n\n function xyz2lab(t) {\n return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;\n }\n\n function lab2xyz(t) {\n return t > t1 ? t * t * t : t2 * (t - t0);\n }\n\n function lrgb2rgb(x) {\n return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);\n }\n\n function rgb2lrgb(x) {\n return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);\n }\n\n function hclConvert(o) {\n if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);\n if (!(o instanceof Lab)) o = labConvert(o);\n if (o.a === 0 && o.b === 0) return new Hcl(NaN, 0 < o.l && o.l < 100 ? 0 : NaN, o.l, o.opacity);\n var h = Math.atan2(o.b, o.a) * rad2deg;\n return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);\n }\n\n function hcl(h, c, l, opacity) {\n return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);\n }\n\n function Hcl(h, c, l, opacity) {\n this.h = +h;\n this.c = +c;\n this.l = +l;\n this.opacity = +opacity;\n }\n\n function hcl2lab(o) {\n if (isNaN(o.h)) return new Lab(o.l, 0, 0, o.opacity);\n var h = o.h * deg2rad;\n return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);\n }\n\n define(Hcl, hcl, extend(Color, {\n brighter: function(k) {\n return new Hcl(this.h, this.c, this.l + K * (k == null ? 1 : k), this.opacity);\n },\n darker: function(k) {\n return new Hcl(this.h, this.c, this.l - K * (k == null ? 1 : k), this.opacity);\n },\n rgb: function() {\n return hcl2lab(this).rgb();\n }\n }));\n\n var A = -0.14861,\n B = +1.78277,\n C = -0.29227,\n D = -0.90649,\n E = +1.97294,\n ED = E * D,\n EB = E * B,\n BC_DA = B * C - D * A;\n\n function cubehelixConvert(o) {\n if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);\n if (!(o instanceof Rgb)) o = rgbConvert(o);\n var r = o.r / 255,\n g = o.g / 255,\n b = o.b / 255,\n l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),\n bl = b - l,\n k = (E * (g - l) - C * bl) / D,\n s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1\n h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;\n return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);\n }\n\n function cubehelix(h, s, l, opacity) {\n return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);\n }\n\n function Cubehelix(h, s, l, opacity) {\n this.h = +h;\n this.s = +s;\n this.l = +l;\n this.opacity = +opacity;\n }\n\n define(Cubehelix, cubehelix, extend(Color, {\n brighter: function(k) {\n k = k == null ? brighter : Math.pow(brighter, k);\n return new Cubehelix(this.h, this.s, this.l * k, this.opacity);\n },\n darker: function(k) {\n k = k == null ? darker : Math.pow(darker, k);\n return new Cubehelix(this.h, this.s, this.l * k, this.opacity);\n },\n rgb: function() {\n var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,\n l = +this.l,\n a = isNaN(this.s) ? 0 : this.s * l * (1 - l),\n cosh = Math.cos(h),\n sinh = Math.sin(h);\n return new Rgb(\n 255 * (l + a * (A * cosh + B * sinh)),\n 255 * (l + a * (C * cosh + D * sinh)),\n 255 * (l + a * (E * cosh)),\n this.opacity\n );\n }\n }));\n\n function constant(x) {\n return function() {\n return x;\n };\n }\n\n function linear(a, d) {\n return function(t) {\n return a + t * d;\n };\n }\n\n function exponential(a, b, y) {\n return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {\n return Math.pow(a + t * b, y);\n };\n }\n\n function gamma(y) {\n return (y = +y) === 1 ? nogamma : function(a, b) {\n return b - a ? exponential(a, b, y) : constant(isNaN(a) ? b : a);\n };\n }\n\n function nogamma(a, b) {\n var d = b - a;\n return d ? linear(a, d) : constant(isNaN(a) ? b : a);\n }\n\n var rgb$1 = (function rgbGamma(y) {\n var color = gamma(y);\n\n function rgb$1(start, end) {\n var r = color((start = rgb(start)).r, (end = rgb(end)).r),\n g = color(start.g, end.g),\n b = color(start.b, end.b),\n opacity = nogamma(start.opacity, end.opacity);\n return function(t) {\n start.r = r(t);\n start.g = g(t);\n start.b = b(t);\n start.opacity = opacity(t);\n return start + \"\";\n };\n }\n\n rgb$1.gamma = rgbGamma;\n\n return rgb$1;\n })(1);\n\n function numberArray(a, b) {\n if (!b) b = [];\n var n = a ? Math.min(b.length, a.length) : 0,\n c = b.slice(),\n i;\n return function(t) {\n for (i = 0; i < n; ++i) c[i] = a[i] * (1 - t) + b[i] * t;\n return c;\n };\n }\n\n function isNumberArray(x) {\n return ArrayBuffer.isView(x) && !(x instanceof DataView);\n }\n\n function genericArray(a, b) {\n var nb = b ? b.length : 0,\n na = a ? Math.min(nb, a.length) : 0,\n x = new Array(na),\n c = new Array(nb),\n i;\n\n for (i = 0; i < na; ++i) x[i] = interpolate(a[i], b[i]);\n for (; i < nb; ++i) c[i] = b[i];\n\n return function(t) {\n for (i = 0; i < na; ++i) c[i] = x[i](t);\n return c;\n };\n }\n\n function date(a, b) {\n var d = new Date;\n return a = +a, b = +b, function(t) {\n return d.setTime(a * (1 - t) + b * t), d;\n };\n }\n\n function interpolateNumber(a, b) {\n return a = +a, b = +b, function(t) {\n return a * (1 - t) + b * t;\n };\n }\n\n function object(a, b) {\n var i = {},\n c = {},\n k;\n\n if (a === null || typeof a !== \"object\") a = {};\n if (b === null || typeof b !== \"object\") b = {};\n\n for (k in b) {\n if (k in a) {\n i[k] = interpolate(a[k], b[k]);\n } else {\n c[k] = b[k];\n }\n }\n\n return function(t) {\n for (k in i) c[k] = i[k](t);\n return c;\n };\n }\n\n var reA = /[-+]?(?:\\d+\\.?\\d*|\\.?\\d+)(?:[eE][-+]?\\d+)?/g,\n reB = new RegExp(reA.source, \"g\");\n\n function zero(b) {\n return function() {\n return b;\n };\n }\n\n function one(b) {\n return function(t) {\n return b(t) + \"\";\n };\n }\n\n function string(a, b) {\n var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b\n am, // current match in a\n bm, // current match in b\n bs, // string preceding current number in b, if any\n i = -1, // index in s\n s = [], // string constants and placeholders\n q = []; // number interpolators\n\n // Coerce inputs to strings.\n a = a + \"\", b = b + \"\";\n\n // Interpolate pairs of numbers in a & b.\n while ((am = reA.exec(a))\n && (bm = reB.exec(b))) {\n if ((bs = bm.index) > bi) { // a string precedes the next number in b\n bs = b.slice(bi, bs);\n if (s[i]) s[i] += bs; // coalesce with previous string\n else s[++i] = bs;\n }\n if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match\n if (s[i]) s[i] += bm; // coalesce with previous string\n else s[++i] = bm;\n } else { // interpolate non-matching numbers\n s[++i] = null;\n q.push({i: i, x: interpolateNumber(am, bm)});\n }\n bi = reB.lastIndex;\n }\n\n // Add remains of b.\n if (bi < b.length) {\n bs = b.slice(bi);\n if (s[i]) s[i] += bs; // coalesce with previous string\n else s[++i] = bs;\n }\n\n // Special optimization for only a single match.\n // Otherwise, interpolate each of the numbers and rejoin the string.\n return s.length < 2 ? (q[0]\n ? one(q[0].x)\n : zero(b))\n : (b = q.length, function(t) {\n for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);\n return s.join(\"\");\n });\n }\n\n function interpolate(a, b) {\n var t = typeof b, c;\n return b == null || t === \"boolean\" ? constant(b)\n : (t === \"number\" ? interpolateNumber\n : t === \"string\" ? ((c = color(b)) ? (b = c, rgb$1) : string)\n : b instanceof color ? rgb$1\n : b instanceof Date ? date\n : isNumberArray(b) ? numberArray\n : Array.isArray(b) ? genericArray\n : typeof b.valueOf !== \"function\" && typeof b.toString !== \"function\" || isNaN(b) ? object\n : interpolateNumber)(a, b);\n }\n\n function interpolateRound(a, b) {\n return a = +a, b = +b, function(t) {\n return Math.round(a * (1 - t) + b * t);\n };\n }\n\n function constant$1(x) {\n return function() {\n return x;\n };\n }\n\n function number(x) {\n return +x;\n }\n\n var unit = [0, 1];\n\n function identity(x) {\n return x;\n }\n\n function normalize(a, b) {\n return (b -= (a = +a))\n ? function(x) { return (x - a) / b; }\n : constant$1(isNaN(b) ? NaN : 0.5);\n }\n\n function clamper(a, b) {\n var t;\n if (a > b) t = a, a = b, b = t;\n return function(x) { return Math.max(a, Math.min(b, x)); };\n }\n\n // normalize(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].\n // interpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding range value x in [a,b].\n function bimap(domain, range, interpolate) {\n var d0 = domain[0], d1 = domain[1], r0 = range[0], r1 = range[1];\n if (d1 < d0) d0 = normalize(d1, d0), r0 = interpolate(r1, r0);\n else d0 = normalize(d0, d1), r0 = interpolate(r0, r1);\n return function(x) { return r0(d0(x)); };\n }\n\n function polymap(domain, range, interpolate) {\n var j = Math.min(domain.length, range.length) - 1,\n d = new Array(j),\n r = new Array(j),\n i = -1;\n\n // Reverse descending domains.\n if (domain[j] < domain[0]) {\n domain = domain.slice().reverse();\n range = range.slice().reverse();\n }\n\n while (++i < j) {\n d[i] = normalize(domain[i], domain[i + 1]);\n r[i] = interpolate(range[i], range[i + 1]);\n }\n\n return function(x) {\n var i = bisectRight(domain, x, 1, j) - 1;\n return r[i](d[i](x));\n };\n }\n\n function copy(source, target) {\n return target\n .domain(source.domain())\n .range(source.range())\n .interpolate(source.interpolate())\n .clamp(source.clamp())\n .unknown(source.unknown());\n }\n\n function transformer() {\n var domain = unit,\n range = unit,\n interpolate$1 = interpolate,\n transform,\n untransform,\n unknown,\n clamp = identity,\n piecewise,\n output,\n input;\n\n function rescale() {\n var n = Math.min(domain.length, range.length);\n if (clamp !== identity) clamp = clamper(domain[0], domain[n - 1]);\n piecewise = n > 2 ? polymap : bimap;\n output = input = null;\n return scale;\n }\n\n function scale(x) {\n return isNaN(x = +x) ? unknown : (output || (output = piecewise(domain.map(transform), range, interpolate$1)))(transform(clamp(x)));\n }\n\n scale.invert = function(y) {\n return clamp(untransform((input || (input = piecewise(range, domain.map(transform), interpolateNumber)))(y)));\n };\n\n scale.domain = function(_) {\n return arguments.length ? (domain = Array.from(_, number), rescale()) : domain.slice();\n };\n\n scale.range = function(_) {\n return arguments.length ? (range = Array.from(_), rescale()) : range.slice();\n };\n\n scale.rangeRound = function(_) {\n return range = Array.from(_), interpolate$1 = interpolateRound, rescale();\n };\n\n scale.clamp = function(_) {\n return arguments.length ? (clamp = _ ? true : identity, rescale()) : clamp !== identity;\n };\n\n scale.interpolate = function(_) {\n return arguments.length ? (interpolate$1 = _, rescale()) : interpolate$1;\n };\n\n scale.unknown = function(_) {\n return arguments.length ? (unknown = _, scale) : unknown;\n };\n\n return function(t, u) {\n transform = t, untransform = u;\n return rescale();\n };\n }\n\n function continuous() {\n return transformer()(identity, identity);\n }\n\n // Computes the decimal coefficient and exponent of the specified number x with\n // significant digits p, where x is positive and p is in [1, 21] or undefined.\n // For example, formatDecimal(1.23) returns [\"123\", 0].\n function formatDecimal(x, p) {\n if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf(\"e\")) < 0) return null; // NaN, ±Infinity\n var i, coefficient = x.slice(0, i);\n\n // The string returned by toExponential either has the form \\d\\.\\d+e[-+]\\d+\n // (e.g., 1.2e+3) or the form \\de[-+]\\d+ (e.g., 1e+3).\n return [\n coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,\n +x.slice(i + 1)\n ];\n }\n\n function exponent(x) {\n return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;\n }\n\n function formatGroup(grouping, thousands) {\n return function(value, width) {\n var i = value.length,\n t = [],\n j = 0,\n g = grouping[0],\n length = 0;\n\n while (i > 0 && g > 0) {\n if (length + g + 1 > width) g = Math.max(1, width - length);\n t.push(value.substring(i -= g, i + g));\n if ((length += g + 1) > width) break;\n g = grouping[j = (j + 1) % grouping.length];\n }\n\n return t.reverse().join(thousands);\n };\n }\n\n function formatNumerals(numerals) {\n return function(value) {\n return value.replace(/[0-9]/g, function(i) {\n return numerals[+i];\n });\n };\n }\n\n // [[fill]align][sign][symbol][0][width][,][.precision][~][type]\n var re = /^(?:(.)?([<>=^]))?([+\\-( ])?([$#])?(0)?(\\d+)?(,)?(\\.\\d+)?(~)?([a-z%])?$/i;\n\n function formatSpecifier(specifier) {\n if (!(match = re.exec(specifier))) throw new Error(\"invalid format: \" + specifier);\n var match;\n return new FormatSpecifier({\n fill: match[1],\n align: match[2],\n sign: match[3],\n symbol: match[4],\n zero: match[5],\n width: match[6],\n comma: match[7],\n precision: match[8] && match[8].slice(1),\n trim: match[9],\n type: match[10]\n });\n }\n\n formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof\n\n function FormatSpecifier(specifier) {\n this.fill = specifier.fill === undefined ? \" \" : specifier.fill + \"\";\n this.align = specifier.align === undefined ? \">\" : specifier.align + \"\";\n this.sign = specifier.sign === undefined ? \"-\" : specifier.sign + \"\";\n this.symbol = specifier.symbol === undefined ? \"\" : specifier.symbol + \"\";\n this.zero = !!specifier.zero;\n this.width = specifier.width === undefined ? undefined : +specifier.width;\n this.comma = !!specifier.comma;\n this.precision = specifier.precision === undefined ? undefined : +specifier.precision;\n this.trim = !!specifier.trim;\n this.type = specifier.type === undefined ? \"\" : specifier.type + \"\";\n }\n\n FormatSpecifier.prototype.toString = function() {\n return this.fill\n + this.align\n + this.sign\n + this.symbol\n + (this.zero ? \"0\" : \"\")\n + (this.width === undefined ? \"\" : Math.max(1, this.width | 0))\n + (this.comma ? \",\" : \"\")\n + (this.precision === undefined ? \"\" : \".\" + Math.max(0, this.precision | 0))\n + (this.trim ? \"~\" : \"\")\n + this.type;\n };\n\n // Trims insignificant zeros, e.g., replaces 1.2000k with 1.2k.\n function formatTrim(s) {\n out: for (var n = s.length, i = 1, i0 = -1, i1; i < n; ++i) {\n switch (s[i]) {\n case \".\": i0 = i1 = i; break;\n case \"0\": if (i0 === 0) i0 = i; i1 = i; break;\n default: if (!+s[i]) break out; if (i0 > 0) i0 = 0; break;\n }\n }\n return i0 > 0 ? s.slice(0, i0) + s.slice(i1 + 1) : s;\n }\n\n var prefixExponent;\n\n function formatPrefixAuto(x, p) {\n var d = formatDecimal(x, p);\n if (!d) return x + \"\";\n var coefficient = d[0],\n exponent = d[1],\n i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,\n n = coefficient.length;\n return i === n ? coefficient\n : i > n ? coefficient + new Array(i - n + 1).join(\"0\")\n : i > 0 ? coefficient.slice(0, i) + \".\" + coefficient.slice(i)\n : \"0.\" + new Array(1 - i).join(\"0\") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!\n }\n\n function formatRounded(x, p) {\n var d = formatDecimal(x, p);\n if (!d) return x + \"\";\n var coefficient = d[0],\n exponent = d[1];\n return exponent < 0 ? \"0.\" + new Array(-exponent).join(\"0\") + coefficient\n : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + \".\" + coefficient.slice(exponent + 1)\n : coefficient + new Array(exponent - coefficient.length + 2).join(\"0\");\n }\n\n var formatTypes = {\n \"%\": function(x, p) { return (x * 100).toFixed(p); },\n \"b\": function(x) { return Math.round(x).toString(2); },\n \"c\": function(x) { return x + \"\"; },\n \"d\": function(x) { return Math.round(x).toString(10); },\n \"e\": function(x, p) { return x.toExponential(p); },\n \"f\": function(x, p) { return x.toFixed(p); },\n \"g\": function(x, p) { return x.toPrecision(p); },\n \"o\": function(x) { return Math.round(x).toString(8); },\n \"p\": function(x, p) { return formatRounded(x * 100, p); },\n \"r\": formatRounded,\n \"s\": formatPrefixAuto,\n \"X\": function(x) { return Math.round(x).toString(16).toUpperCase(); },\n \"x\": function(x) { return Math.round(x).toString(16); }\n };\n\n function identity$1(x) {\n return x;\n }\n\n var map = Array.prototype.map,\n prefixes = [\"y\",\"z\",\"a\",\"f\",\"p\",\"n\",\"µ\",\"m\",\"\",\"k\",\"M\",\"G\",\"T\",\"P\",\"E\",\"Z\",\"Y\"];\n\n function formatLocale(locale) {\n var group = locale.grouping === undefined || locale.thousands === undefined ? identity$1 : formatGroup(map.call(locale.grouping, Number), locale.thousands + \"\"),\n currencyPrefix = locale.currency === undefined ? \"\" : locale.currency[0] + \"\",\n currencySuffix = locale.currency === undefined ? \"\" : locale.currency[1] + \"\",\n decimal = locale.decimal === undefined ? \".\" : locale.decimal + \"\",\n numerals = locale.numerals === undefined ? identity$1 : formatNumerals(map.call(locale.numerals, String)),\n percent = locale.percent === undefined ? \"%\" : locale.percent + \"\",\n minus = locale.minus === undefined ? \"-\" : locale.minus + \"\",\n nan = locale.nan === undefined ? \"NaN\" : locale.nan + \"\";\n\n function newFormat(specifier) {\n specifier = formatSpecifier(specifier);\n\n var fill = specifier.fill,\n align = specifier.align,\n sign = specifier.sign,\n symbol = specifier.symbol,\n zero = specifier.zero,\n width = specifier.width,\n comma = specifier.comma,\n precision = specifier.precision,\n trim = specifier.trim,\n type = specifier.type;\n\n // The \"n\" type is an alias for \",g\".\n if (type === \"n\") comma = true, type = \"g\";\n\n // The \"\" type, and any invalid type, is an alias for \".12~g\".\n else if (!formatTypes[type]) precision === undefined && (precision = 12), trim = true, type = \"g\";\n\n // If zero fill is specified, padding goes after sign and before digits.\n if (zero || (fill === \"0\" && align === \"=\")) zero = true, fill = \"0\", align = \"=\";\n\n // Compute the prefix and suffix.\n // For SI-prefix, the suffix is lazily computed.\n var prefix = symbol === \"$\" ? currencyPrefix : symbol === \"#\" && /[boxX]/.test(type) ? \"0\" + type.toLowerCase() : \"\",\n suffix = symbol === \"$\" ? currencySuffix : /[%p]/.test(type) ? percent : \"\";\n\n // What format function should we use?\n // Is this an integer type?\n // Can this type generate exponential notation?\n var formatType = formatTypes[type],\n maybeSuffix = /[defgprs%]/.test(type);\n\n // Set the default precision if not specified,\n // or clamp the specified precision to the supported range.\n // For significant precision, it must be in [1, 21].\n // For fixed precision, it must be in [0, 20].\n precision = precision === undefined ? 6\n : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision))\n : Math.max(0, Math.min(20, precision));\n\n function format(value) {\n var valuePrefix = prefix,\n valueSuffix = suffix,\n i, n, c;\n\n if (type === \"c\") {\n valueSuffix = formatType(value) + valueSuffix;\n value = \"\";\n } else {\n value = +value;\n\n // Determine the sign. -0 is not less than 0, but 1 / -0 is!\n var valueNegative = value < 0 || 1 / value < 0;\n\n // Perform the initial formatting.\n value = isNaN(value) ? nan : formatType(Math.abs(value), precision);\n\n // Trim insignificant zeros.\n if (trim) value = formatTrim(value);\n\n // If a negative value rounds to zero after formatting, and no explicit positive sign is requested, hide the sign.\n if (valueNegative && +value === 0 && sign !== \"+\") valueNegative = false;\n\n // Compute the prefix and suffix.\n valuePrefix = (valueNegative ? (sign === \"(\" ? sign : minus) : sign === \"-\" || sign === \"(\" ? \"\" : sign) + valuePrefix;\n valueSuffix = (type === \"s\" ? prefixes[8 + prefixExponent / 3] : \"\") + valueSuffix + (valueNegative && sign === \"(\" ? \")\" : \"\");\n\n // Break the formatted value into the integer “value” part that can be\n // grouped, and fractional or exponential “suffix” part that is not.\n if (maybeSuffix) {\n i = -1, n = value.length;\n while (++i < n) {\n if (c = value.charCodeAt(i), 48 > c || c > 57) {\n valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;\n value = value.slice(0, i);\n break;\n }\n }\n }\n }\n\n // If the fill character is not \"0\", grouping is applied before padding.\n if (comma && !zero) value = group(value, Infinity);\n\n // Compute the padding.\n var length = valuePrefix.length + value.length + valueSuffix.length,\n padding = length < width ? new Array(width - length + 1).join(fill) : \"\";\n\n // If the fill character is \"0\", grouping is applied after padding.\n if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = \"\";\n\n // Reconstruct the final output based on the desired alignment.\n switch (align) {\n case \"<\": value = valuePrefix + value + valueSuffix + padding; break;\n case \"=\": value = valuePrefix + padding + value + valueSuffix; break;\n case \"^\": value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length); break;\n default: value = padding + valuePrefix + value + valueSuffix; break;\n }\n\n return numerals(value);\n }\n\n format.toString = function() {\n return specifier + \"\";\n };\n\n return format;\n }\n\n function formatPrefix(specifier, value) {\n var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = \"f\", specifier)),\n e = Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3,\n k = Math.pow(10, -e),\n prefix = prefixes[8 + e / 3];\n return function(value) {\n return f(k * value) + prefix;\n };\n }\n\n return {\n format: newFormat,\n formatPrefix: formatPrefix\n };\n }\n\n var locale;\n var format;\n var formatPrefix;\n\n defaultLocale({\n decimal: \".\",\n thousands: \",\",\n grouping: [3],\n currency: [\"$\", \"\"],\n minus: \"-\"\n });\n\n function defaultLocale(definition) {\n locale = formatLocale(definition);\n format = locale.format;\n formatPrefix = locale.formatPrefix;\n return locale;\n }\n\n function precisionFixed(step) {\n return Math.max(0, -exponent(Math.abs(step)));\n }\n\n function precisionPrefix(step, value) {\n return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3 - exponent(Math.abs(step)));\n }\n\n function precisionRound(step, max) {\n step = Math.abs(step), max = Math.abs(max) - step;\n return Math.max(0, exponent(max) - exponent(step)) + 1;\n }\n\n function tickFormat(start, stop, count, specifier) {\n var step = tickStep(start, stop, count),\n precision;\n specifier = formatSpecifier(specifier == null ? \",f\" : specifier);\n switch (specifier.type) {\n case \"s\": {\n var value = Math.max(Math.abs(start), Math.abs(stop));\n if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;\n return formatPrefix(specifier, value);\n }\n case \"\":\n case \"e\":\n case \"g\":\n case \"p\":\n case \"r\": {\n if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === \"e\");\n break;\n }\n case \"f\":\n case \"%\": {\n if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === \"%\") * 2;\n break;\n }\n }\n return format(specifier);\n }\n\n function linearish(scale) {\n var domain = scale.domain;\n\n scale.ticks = function(count) {\n var d = domain();\n return ticks(d[0], d[d.length - 1], count == null ? 10 : count);\n };\n\n scale.tickFormat = function(count, specifier) {\n var d = domain();\n return tickFormat(d[0], d[d.length - 1], count == null ? 10 : count, specifier);\n };\n\n scale.nice = function(count) {\n if (count == null) count = 10;\n\n var d = domain(),\n i0 = 0,\n i1 = d.length - 1,\n start = d[i0],\n stop = d[i1],\n step;\n\n if (stop < start) {\n step = start, start = stop, stop = step;\n step = i0, i0 = i1, i1 = step;\n }\n\n step = tickIncrement(start, stop, count);\n\n if (step > 0) {\n start = Math.floor(start / step) * step;\n stop = Math.ceil(stop / step) * step;\n step = tickIncrement(start, stop, count);\n } else if (step < 0) {\n start = Math.ceil(start * step) / step;\n stop = Math.floor(stop * step) / step;\n step = tickIncrement(start, stop, count);\n }\n\n if (step > 0) {\n d[i0] = Math.floor(start / step) * step;\n d[i1] = Math.ceil(stop / step) * step;\n domain(d);\n } else if (step < 0) {\n d[i0] = Math.ceil(start * step) / step;\n d[i1] = Math.floor(stop * step) / step;\n domain(d);\n }\n\n return scale;\n };\n\n return scale;\n }\n\n function linear$1() {\n var scale = continuous();\n\n scale.copy = function() {\n return copy(scale, linear$1());\n };\n\n initRange.apply(scale, arguments);\n\n return linearish(scale);\n }\n\n var t0$1 = new Date,\n t1$1 = new Date;\n\n function newInterval(floori, offseti, count, field) {\n\n function interval(date) {\n return floori(date = arguments.length === 0 ? new Date : new Date(+date)), date;\n }\n\n interval.floor = function(date) {\n return floori(date = new Date(+date)), date;\n };\n\n interval.ceil = function(date) {\n return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;\n };\n\n interval.round = function(date) {\n var d0 = interval(date),\n d1 = interval.ceil(date);\n return date - d0 < d1 - date ? d0 : d1;\n };\n\n interval.offset = function(date, step) {\n return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;\n };\n\n interval.range = function(start, stop, step) {\n var range = [], previous;\n start = interval.ceil(start);\n step = step == null ? 1 : Math.floor(step);\n if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date\n do range.push(previous = new Date(+start)), offseti(start, step), floori(start);\n while (previous < start && start < stop);\n return range;\n };\n\n interval.filter = function(test) {\n return newInterval(function(date) {\n if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);\n }, function(date, step) {\n if (date >= date) {\n if (step < 0) while (++step <= 0) {\n while (offseti(date, -1), !test(date)) {} // eslint-disable-line no-empty\n } else while (--step >= 0) {\n while (offseti(date, +1), !test(date)) {} // eslint-disable-line no-empty\n }\n }\n });\n };\n\n if (count) {\n interval.count = function(start, end) {\n t0$1.setTime(+start), t1$1.setTime(+end);\n floori(t0$1), floori(t1$1);\n return Math.floor(count(t0$1, t1$1));\n };\n\n interval.every = function(step) {\n step = Math.floor(step);\n return !isFinite(step) || !(step > 0) ? null\n : !(step > 1) ? interval\n : interval.filter(field\n ? function(d) { return field(d) % step === 0; }\n : function(d) { return interval.count(0, d) % step === 0; });\n };\n }\n\n return interval;\n }\n\n var millisecond = newInterval(function() {\n // noop\n }, function(date, step) {\n date.setTime(+date + step);\n }, function(start, end) {\n return end - start;\n });\n\n // An optimized implementation for this simple case.\n millisecond.every = function(k) {\n k = Math.floor(k);\n if (!isFinite(k) || !(k > 0)) return null;\n if (!(k > 1)) return millisecond;\n return newInterval(function(date) {\n date.setTime(Math.floor(date / k) * k);\n }, function(date, step) {\n date.setTime(+date + step * k);\n }, function(start, end) {\n return (end - start) / k;\n });\n };\n\n var durationSecond = 1e3;\n var durationMinute = 6e4;\n var durationHour = 36e5;\n var durationDay = 864e5;\n var durationWeek = 6048e5;\n\n var second = newInterval(function(date) {\n date.setTime(date - date.getMilliseconds());\n }, function(date, step) {\n date.setTime(+date + step * durationSecond);\n }, function(start, end) {\n return (end - start) / durationSecond;\n }, function(date) {\n return date.getUTCSeconds();\n });\n\n var minute = newInterval(function(date) {\n date.setTime(date - date.getMilliseconds() - date.getSeconds() * durationSecond);\n }, function(date, step) {\n date.setTime(+date + step * durationMinute);\n }, function(start, end) {\n return (end - start) / durationMinute;\n }, function(date) {\n return date.getMinutes();\n });\n\n var hour = newInterval(function(date) {\n date.setTime(date - date.getMilliseconds() - date.getSeconds() * durationSecond - date.getMinutes() * durationMinute);\n }, function(date, step) {\n date.setTime(+date + step * durationHour);\n }, function(start, end) {\n return (end - start) / durationHour;\n }, function(date) {\n return date.getHours();\n });\n\n var day = newInterval(function(date) {\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setDate(date.getDate() + step);\n }, function(start, end) {\n return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationDay;\n }, function(date) {\n return date.getDate() - 1;\n });\n\n function weekday(i) {\n return newInterval(function(date) {\n date.setDate(date.getDate() - (date.getDay() + 7 - i) % 7);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setDate(date.getDate() + step * 7);\n }, function(start, end) {\n return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationWeek;\n });\n }\n\n var sunday = weekday(0);\n var monday = weekday(1);\n var tuesday = weekday(2);\n var wednesday = weekday(3);\n var thursday = weekday(4);\n var friday = weekday(5);\n var saturday = weekday(6);\n\n var month = newInterval(function(date) {\n date.setDate(1);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setMonth(date.getMonth() + step);\n }, function(start, end) {\n return end.getMonth() - start.getMonth() + (end.getFullYear() - start.getFullYear()) * 12;\n }, function(date) {\n return date.getMonth();\n });\n\n var year = newInterval(function(date) {\n date.setMonth(0, 1);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setFullYear(date.getFullYear() + step);\n }, function(start, end) {\n return end.getFullYear() - start.getFullYear();\n }, function(date) {\n return date.getFullYear();\n });\n\n // An optimized implementation for this simple case.\n year.every = function(k) {\n return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {\n date.setFullYear(Math.floor(date.getFullYear() / k) * k);\n date.setMonth(0, 1);\n date.setHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setFullYear(date.getFullYear() + step * k);\n });\n };\n\n var utcMinute = newInterval(function(date) {\n date.setUTCSeconds(0, 0);\n }, function(date, step) {\n date.setTime(+date + step * durationMinute);\n }, function(start, end) {\n return (end - start) / durationMinute;\n }, function(date) {\n return date.getUTCMinutes();\n });\n\n var utcHour = newInterval(function(date) {\n date.setUTCMinutes(0, 0, 0);\n }, function(date, step) {\n date.setTime(+date + step * durationHour);\n }, function(start, end) {\n return (end - start) / durationHour;\n }, function(date) {\n return date.getUTCHours();\n });\n\n var utcDay = newInterval(function(date) {\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCDate(date.getUTCDate() + step);\n }, function(start, end) {\n return (end - start) / durationDay;\n }, function(date) {\n return date.getUTCDate() - 1;\n });\n\n function utcWeekday(i) {\n return newInterval(function(date) {\n date.setUTCDate(date.getUTCDate() - (date.getUTCDay() + 7 - i) % 7);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCDate(date.getUTCDate() + step * 7);\n }, function(start, end) {\n return (end - start) / durationWeek;\n });\n }\n\n var utcSunday = utcWeekday(0);\n var utcMonday = utcWeekday(1);\n var utcTuesday = utcWeekday(2);\n var utcWednesday = utcWeekday(3);\n var utcThursday = utcWeekday(4);\n var utcFriday = utcWeekday(5);\n var utcSaturday = utcWeekday(6);\n\n var utcMonth = newInterval(function(date) {\n date.setUTCDate(1);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCMonth(date.getUTCMonth() + step);\n }, function(start, end) {\n return end.getUTCMonth() - start.getUTCMonth() + (end.getUTCFullYear() - start.getUTCFullYear()) * 12;\n }, function(date) {\n return date.getUTCMonth();\n });\n\n var utcYear = newInterval(function(date) {\n date.setUTCMonth(0, 1);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCFullYear(date.getUTCFullYear() + step);\n }, function(start, end) {\n return end.getUTCFullYear() - start.getUTCFullYear();\n }, function(date) {\n return date.getUTCFullYear();\n });\n\n // An optimized implementation for this simple case.\n utcYear.every = function(k) {\n return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {\n date.setUTCFullYear(Math.floor(date.getUTCFullYear() / k) * k);\n date.setUTCMonth(0, 1);\n date.setUTCHours(0, 0, 0, 0);\n }, function(date, step) {\n date.setUTCFullYear(date.getUTCFullYear() + step * k);\n });\n };\n\n function localDate(d) {\n if (0 <= d.y && d.y < 100) {\n var date = new Date(-1, d.m, d.d, d.H, d.M, d.S, d.L);\n date.setFullYear(d.y);\n return date;\n }\n return new Date(d.y, d.m, d.d, d.H, d.M, d.S, d.L);\n }\n\n function utcDate(d) {\n if (0 <= d.y && d.y < 100) {\n var date = new Date(Date.UTC(-1, d.m, d.d, d.H, d.M, d.S, d.L));\n date.setUTCFullYear(d.y);\n return date;\n }\n return new Date(Date.UTC(d.y, d.m, d.d, d.H, d.M, d.S, d.L));\n }\n\n function newDate(y, m, d) {\n return {y: y, m: m, d: d, H: 0, M: 0, S: 0, L: 0};\n }\n\n function formatLocale$1(locale) {\n var locale_dateTime = locale.dateTime,\n locale_date = locale.date,\n locale_time = locale.time,\n locale_periods = locale.periods,\n locale_weekdays = locale.days,\n locale_shortWeekdays = locale.shortDays,\n locale_months = locale.months,\n locale_shortMonths = locale.shortMonths;\n\n var periodRe = formatRe(locale_periods),\n periodLookup = formatLookup(locale_periods),\n weekdayRe = formatRe(locale_weekdays),\n weekdayLookup = formatLookup(locale_weekdays),\n shortWeekdayRe = formatRe(locale_shortWeekdays),\n shortWeekdayLookup = formatLookup(locale_shortWeekdays),\n monthRe = formatRe(locale_months),\n monthLookup = formatLookup(locale_months),\n shortMonthRe = formatRe(locale_shortMonths),\n shortMonthLookup = formatLookup(locale_shortMonths);\n\n var formats = {\n \"a\": formatShortWeekday,\n \"A\": formatWeekday,\n \"b\": formatShortMonth,\n \"B\": formatMonth,\n \"c\": null,\n \"d\": formatDayOfMonth,\n \"e\": formatDayOfMonth,\n \"f\": formatMicroseconds,\n \"H\": formatHour24,\n \"I\": formatHour12,\n \"j\": formatDayOfYear,\n \"L\": formatMilliseconds,\n \"m\": formatMonthNumber,\n \"M\": formatMinutes,\n \"p\": formatPeriod,\n \"q\": formatQuarter,\n \"Q\": formatUnixTimestamp,\n \"s\": formatUnixTimestampSeconds,\n \"S\": formatSeconds,\n \"u\": formatWeekdayNumberMonday,\n \"U\": formatWeekNumberSunday,\n \"V\": formatWeekNumberISO,\n \"w\": formatWeekdayNumberSunday,\n \"W\": formatWeekNumberMonday,\n \"x\": null,\n \"X\": null,\n \"y\": formatYear,\n \"Y\": formatFullYear,\n \"Z\": formatZone,\n \"%\": formatLiteralPercent\n };\n\n var utcFormats = {\n \"a\": formatUTCShortWeekday,\n \"A\": formatUTCWeekday,\n \"b\": formatUTCShortMonth,\n \"B\": formatUTCMonth,\n \"c\": null,\n \"d\": formatUTCDayOfMonth,\n \"e\": formatUTCDayOfMonth,\n \"f\": formatUTCMicroseconds,\n \"H\": formatUTCHour24,\n \"I\": formatUTCHour12,\n \"j\": formatUTCDayOfYear,\n \"L\": formatUTCMilliseconds,\n \"m\": formatUTCMonthNumber,\n \"M\": formatUTCMinutes,\n \"p\": formatUTCPeriod,\n \"q\": formatUTCQuarter,\n \"Q\": formatUnixTimestamp,\n \"s\": formatUnixTimestampSeconds,\n \"S\": formatUTCSeconds,\n \"u\": formatUTCWeekdayNumberMonday,\n \"U\": formatUTCWeekNumberSunday,\n \"V\": formatUTCWeekNumberISO,\n \"w\": formatUTCWeekdayNumberSunday,\n \"W\": formatUTCWeekNumberMonday,\n \"x\": null,\n \"X\": null,\n \"y\": formatUTCYear,\n \"Y\": formatUTCFullYear,\n \"Z\": formatUTCZone,\n \"%\": formatLiteralPercent\n };\n\n var parses = {\n \"a\": parseShortWeekday,\n \"A\": parseWeekday,\n \"b\": parseShortMonth,\n \"B\": parseMonth,\n \"c\": parseLocaleDateTime,\n \"d\": parseDayOfMonth,\n \"e\": parseDayOfMonth,\n \"f\": parseMicroseconds,\n \"H\": parseHour24,\n \"I\": parseHour24,\n \"j\": parseDayOfYear,\n \"L\": parseMilliseconds,\n \"m\": parseMonthNumber,\n \"M\": parseMinutes,\n \"p\": parsePeriod,\n \"q\": parseQuarter,\n \"Q\": parseUnixTimestamp,\n \"s\": parseUnixTimestampSeconds,\n \"S\": parseSeconds,\n \"u\": parseWeekdayNumberMonday,\n \"U\": parseWeekNumberSunday,\n \"V\": parseWeekNumberISO,\n \"w\": parseWeekdayNumberSunday,\n \"W\": parseWeekNumberMonday,\n \"x\": parseLocaleDate,\n \"X\": parseLocaleTime,\n \"y\": parseYear,\n \"Y\": parseFullYear,\n \"Z\": parseZone,\n \"%\": parseLiteralPercent\n };\n\n // These recursive directive definitions must be deferred.\n formats.x = newFormat(locale_date, formats);\n formats.X = newFormat(locale_time, formats);\n formats.c = newFormat(locale_dateTime, formats);\n utcFormats.x = newFormat(locale_date, utcFormats);\n utcFormats.X = newFormat(locale_time, utcFormats);\n utcFormats.c = newFormat(locale_dateTime, utcFormats);\n\n function newFormat(specifier, formats) {\n return function(date) {\n var string = [],\n i = -1,\n j = 0,\n n = specifier.length,\n c,\n pad,\n format;\n\n if (!(date instanceof Date)) date = new Date(+date);\n\n while (++i < n) {\n if (specifier.charCodeAt(i) === 37) {\n string.push(specifier.slice(j, i));\n if ((pad = pads[c = specifier.charAt(++i)]) != null) c = specifier.charAt(++i);\n else pad = c === \"e\" ? \" \" : \"0\";\n if (format = formats[c]) c = format(date, pad);\n string.push(c);\n j = i + 1;\n }\n }\n\n string.push(specifier.slice(j, i));\n return string.join(\"\");\n };\n }\n\n function newParse(specifier, Z) {\n return function(string) {\n var d = newDate(1900, undefined, 1),\n i = parseSpecifier(d, specifier, string += \"\", 0),\n week, day$1;\n if (i != string.length) return null;\n\n // If a UNIX timestamp is specified, return it.\n if (\"Q\" in d) return new Date(d.Q);\n if (\"s\" in d) return new Date(d.s * 1000 + (\"L\" in d ? d.L : 0));\n\n // If this is utcParse, never use the local timezone.\n if (Z && !(\"Z\" in d)) d.Z = 0;\n\n // The am-pm flag is 0 for AM, and 1 for PM.\n if (\"p\" in d) d.H = d.H % 12 + d.p * 12;\n\n // If the month was not specified, inherit from the quarter.\n if (d.m === undefined) d.m = \"q\" in d ? d.q : 0;\n\n // Convert day-of-week and week-of-year to day-of-year.\n if (\"V\" in d) {\n if (d.V < 1 || d.V > 53) return null;\n if (!(\"w\" in d)) d.w = 1;\n if (\"Z\" in d) {\n week = utcDate(newDate(d.y, 0, 1)), day$1 = week.getUTCDay();\n week = day$1 > 4 || day$1 === 0 ? utcMonday.ceil(week) : utcMonday(week);\n week = utcDay.offset(week, (d.V - 1) * 7);\n d.y = week.getUTCFullYear();\n d.m = week.getUTCMonth();\n d.d = week.getUTCDate() + (d.w + 6) % 7;\n } else {\n week = localDate(newDate(d.y, 0, 1)), day$1 = week.getDay();\n week = day$1 > 4 || day$1 === 0 ? monday.ceil(week) : monday(week);\n week = day.offset(week, (d.V - 1) * 7);\n d.y = week.getFullYear();\n d.m = week.getMonth();\n d.d = week.getDate() + (d.w + 6) % 7;\n }\n } else if (\"W\" in d || \"U\" in d) {\n if (!(\"w\" in d)) d.w = \"u\" in d ? d.u % 7 : \"W\" in d ? 1 : 0;\n day$1 = \"Z\" in d ? utcDate(newDate(d.y, 0, 1)).getUTCDay() : localDate(newDate(d.y, 0, 1)).getDay();\n d.m = 0;\n d.d = \"W\" in d ? (d.w + 6) % 7 + d.W * 7 - (day$1 + 5) % 7 : d.w + d.U * 7 - (day$1 + 6) % 7;\n }\n\n // If a time zone is specified, all fields are interpreted as UTC and then\n // offset according to the specified time zone.\n if (\"Z\" in d) {\n d.H += d.Z / 100 | 0;\n d.M += d.Z % 100;\n return utcDate(d);\n }\n\n // Otherwise, all fields are in local time.\n return localDate(d);\n };\n }\n\n function parseSpecifier(d, specifier, string, j) {\n var i = 0,\n n = specifier.length,\n m = string.length,\n c,\n parse;\n\n while (i < n) {\n if (j >= m) return -1;\n c = specifier.charCodeAt(i++);\n if (c === 37) {\n c = specifier.charAt(i++);\n parse = parses[c in pads ? specifier.charAt(i++) : c];\n if (!parse || ((j = parse(d, string, j)) < 0)) return -1;\n } else if (c != string.charCodeAt(j++)) {\n return -1;\n }\n }\n\n return j;\n }\n\n function parsePeriod(d, string, i) {\n var n = periodRe.exec(string.slice(i));\n return n ? (d.p = periodLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseShortWeekday(d, string, i) {\n var n = shortWeekdayRe.exec(string.slice(i));\n return n ? (d.w = shortWeekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseWeekday(d, string, i) {\n var n = weekdayRe.exec(string.slice(i));\n return n ? (d.w = weekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseShortMonth(d, string, i) {\n var n = shortMonthRe.exec(string.slice(i));\n return n ? (d.m = shortMonthLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseMonth(d, string, i) {\n var n = monthRe.exec(string.slice(i));\n return n ? (d.m = monthLookup[n[0].toLowerCase()], i + n[0].length) : -1;\n }\n\n function parseLocaleDateTime(d, string, i) {\n return parseSpecifier(d, locale_dateTime, string, i);\n }\n\n function parseLocaleDate(d, string, i) {\n return parseSpecifier(d, locale_date, string, i);\n }\n\n function parseLocaleTime(d, string, i) {\n return parseSpecifier(d, locale_time, string, i);\n }\n\n function formatShortWeekday(d) {\n return locale_shortWeekdays[d.getDay()];\n }\n\n function formatWeekday(d) {\n return locale_weekdays[d.getDay()];\n }\n\n function formatShortMonth(d) {\n return locale_shortMonths[d.getMonth()];\n }\n\n function formatMonth(d) {\n return locale_months[d.getMonth()];\n }\n\n function formatPeriod(d) {\n return locale_periods[+(d.getHours() >= 12)];\n }\n\n function formatQuarter(d) {\n return 1 + ~~(d.getMonth() / 3);\n }\n\n function formatUTCShortWeekday(d) {\n return locale_shortWeekdays[d.getUTCDay()];\n }\n\n function formatUTCWeekday(d) {\n return locale_weekdays[d.getUTCDay()];\n }\n\n function formatUTCShortMonth(d) {\n return locale_shortMonths[d.getUTCMonth()];\n }\n\n function formatUTCMonth(d) {\n return locale_months[d.getUTCMonth()];\n }\n\n function formatUTCPeriod(d) {\n return locale_periods[+(d.getUTCHours() >= 12)];\n }\n\n function formatUTCQuarter(d) {\n return 1 + ~~(d.getUTCMonth() / 3);\n }\n\n return {\n format: function(specifier) {\n var f = newFormat(specifier += \"\", formats);\n f.toString = function() { return specifier; };\n return f;\n },\n parse: function(specifier) {\n var p = newParse(specifier += \"\", false);\n p.toString = function() { return specifier; };\n return p;\n },\n utcFormat: function(specifier) {\n var f = newFormat(specifier += \"\", utcFormats);\n f.toString = function() { return specifier; };\n return f;\n },\n utcParse: function(specifier) {\n var p = newParse(specifier += \"\", true);\n p.toString = function() { return specifier; };\n return p;\n }\n };\n }\n\n var pads = {\"-\": \"\", \"_\": \" \", \"0\": \"0\"},\n numberRe = /^\\s*\\d+/, // note: ignores next directive\n percentRe = /^%/,\n requoteRe = /[\\\\^$*+?|[\\]().{}]/g;\n\n function pad(value, fill, width) {\n var sign = value < 0 ? \"-\" : \"\",\n string = (sign ? -value : value) + \"\",\n length = string.length;\n return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);\n }\n\n function requote(s) {\n return s.replace(requoteRe, \"\\\\$&\");\n }\n\n function formatRe(names) {\n return new RegExp(\"^(?:\" + names.map(requote).join(\"|\") + \")\", \"i\");\n }\n\n function formatLookup(names) {\n var map = {}, i = -1, n = names.length;\n while (++i < n) map[names[i].toLowerCase()] = i;\n return map;\n }\n\n function parseWeekdayNumberSunday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 1));\n return n ? (d.w = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekdayNumberMonday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 1));\n return n ? (d.u = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekNumberSunday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.U = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekNumberISO(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.V = +n[0], i + n[0].length) : -1;\n }\n\n function parseWeekNumberMonday(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.W = +n[0], i + n[0].length) : -1;\n }\n\n function parseFullYear(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 4));\n return n ? (d.y = +n[0], i + n[0].length) : -1;\n }\n\n function parseYear(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.y = +n[0] + (+n[0] > 68 ? 1900 : 2000), i + n[0].length) : -1;\n }\n\n function parseZone(d, string, i) {\n var n = /^(Z)|([+-]\\d\\d)(?::?(\\d\\d))?/.exec(string.slice(i, i + 6));\n return n ? (d.Z = n[1] ? 0 : -(n[2] + (n[3] || \"00\")), i + n[0].length) : -1;\n }\n\n function parseQuarter(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 1));\n return n ? (d.q = n[0] * 3 - 3, i + n[0].length) : -1;\n }\n\n function parseMonthNumber(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.m = n[0] - 1, i + n[0].length) : -1;\n }\n\n function parseDayOfMonth(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.d = +n[0], i + n[0].length) : -1;\n }\n\n function parseDayOfYear(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 3));\n return n ? (d.m = 0, d.d = +n[0], i + n[0].length) : -1;\n }\n\n function parseHour24(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.H = +n[0], i + n[0].length) : -1;\n }\n\n function parseMinutes(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.M = +n[0], i + n[0].length) : -1;\n }\n\n function parseSeconds(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 2));\n return n ? (d.S = +n[0], i + n[0].length) : -1;\n }\n\n function parseMilliseconds(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 3));\n return n ? (d.L = +n[0], i + n[0].length) : -1;\n }\n\n function parseMicroseconds(d, string, i) {\n var n = numberRe.exec(string.slice(i, i + 6));\n return n ? (d.L = Math.floor(n[0] / 1000), i + n[0].length) : -1;\n }\n\n function parseLiteralPercent(d, string, i) {\n var n = percentRe.exec(string.slice(i, i + 1));\n return n ? i + n[0].length : -1;\n }\n\n function parseUnixTimestamp(d, string, i) {\n var n = numberRe.exec(string.slice(i));\n return n ? (d.Q = +n[0], i + n[0].length) : -1;\n }\n\n function parseUnixTimestampSeconds(d, string, i) {\n var n = numberRe.exec(string.slice(i));\n return n ? (d.s = +n[0], i + n[0].length) : -1;\n }\n\n function formatDayOfMonth(d, p) {\n return pad(d.getDate(), p, 2);\n }\n\n function formatHour24(d, p) {\n return pad(d.getHours(), p, 2);\n }\n\n function formatHour12(d, p) {\n return pad(d.getHours() % 12 || 12, p, 2);\n }\n\n function formatDayOfYear(d, p) {\n return pad(1 + day.count(year(d), d), p, 3);\n }\n\n function formatMilliseconds(d, p) {\n return pad(d.getMilliseconds(), p, 3);\n }\n\n function formatMicroseconds(d, p) {\n return formatMilliseconds(d, p) + \"000\";\n }\n\n function formatMonthNumber(d, p) {\n return pad(d.getMonth() + 1, p, 2);\n }\n\n function formatMinutes(d, p) {\n return pad(d.getMinutes(), p, 2);\n }\n\n function formatSeconds(d, p) {\n return pad(d.getSeconds(), p, 2);\n }\n\n function formatWeekdayNumberMonday(d) {\n var day = d.getDay();\n return day === 0 ? 7 : day;\n }\n\n function formatWeekNumberSunday(d, p) {\n return pad(sunday.count(year(d) - 1, d), p, 2);\n }\n\n function formatWeekNumberISO(d, p) {\n var day = d.getDay();\n d = (day >= 4 || day === 0) ? thursday(d) : thursday.ceil(d);\n return pad(thursday.count(year(d), d) + (year(d).getDay() === 4), p, 2);\n }\n\n function formatWeekdayNumberSunday(d) {\n return d.getDay();\n }\n\n function formatWeekNumberMonday(d, p) {\n return pad(monday.count(year(d) - 1, d), p, 2);\n }\n\n function formatYear(d, p) {\n return pad(d.getFullYear() % 100, p, 2);\n }\n\n function formatFullYear(d, p) {\n return pad(d.getFullYear() % 10000, p, 4);\n }\n\n function formatZone(d) {\n var z = d.getTimezoneOffset();\n return (z > 0 ? \"-\" : (z *= -1, \"+\"))\n + pad(z / 60 | 0, \"0\", 2)\n + pad(z % 60, \"0\", 2);\n }\n\n function formatUTCDayOfMonth(d, p) {\n return pad(d.getUTCDate(), p, 2);\n }\n\n function formatUTCHour24(d, p) {\n return pad(d.getUTCHours(), p, 2);\n }\n\n function formatUTCHour12(d, p) {\n return pad(d.getUTCHours() % 12 || 12, p, 2);\n }\n\n function formatUTCDayOfYear(d, p) {\n return pad(1 + utcDay.count(utcYear(d), d), p, 3);\n }\n\n function formatUTCMilliseconds(d, p) {\n return pad(d.getUTCMilliseconds(), p, 3);\n }\n\n function formatUTCMicroseconds(d, p) {\n return formatUTCMilliseconds(d, p) + \"000\";\n }\n\n function formatUTCMonthNumber(d, p) {\n return pad(d.getUTCMonth() + 1, p, 2);\n }\n\n function formatUTCMinutes(d, p) {\n return pad(d.getUTCMinutes(), p, 2);\n }\n\n function formatUTCSeconds(d, p) {\n return pad(d.getUTCSeconds(), p, 2);\n }\n\n function formatUTCWeekdayNumberMonday(d) {\n var dow = d.getUTCDay();\n return dow === 0 ? 7 : dow;\n }\n\n function formatUTCWeekNumberSunday(d, p) {\n return pad(utcSunday.count(utcYear(d) - 1, d), p, 2);\n }\n\n function formatUTCWeekNumberISO(d, p) {\n var day = d.getUTCDay();\n d = (day >= 4 || day === 0) ? utcThursday(d) : utcThursday.ceil(d);\n return pad(utcThursday.count(utcYear(d), d) + (utcYear(d).getUTCDay() === 4), p, 2);\n }\n\n function formatUTCWeekdayNumberSunday(d) {\n return d.getUTCDay();\n }\n\n function formatUTCWeekNumberMonday(d, p) {\n return pad(utcMonday.count(utcYear(d) - 1, d), p, 2);\n }\n\n function formatUTCYear(d, p) {\n return pad(d.getUTCFullYear() % 100, p, 2);\n }\n\n function formatUTCFullYear(d, p) {\n return pad(d.getUTCFullYear() % 10000, p, 4);\n }\n\n function formatUTCZone() {\n return \"+0000\";\n }\n\n function formatLiteralPercent() {\n return \"%\";\n }\n\n function formatUnixTimestamp(d) {\n return +d;\n }\n\n function formatUnixTimestampSeconds(d) {\n return Math.floor(+d / 1000);\n }\n\n var locale$1;\n var timeFormat;\n var timeParse;\n var utcFormat;\n var utcParse;\n\n defaultLocale$1({\n dateTime: \"%x, %X\",\n date: \"%-m/%-d/%Y\",\n time: \"%-I:%M:%S %p\",\n periods: [\"AM\", \"PM\"],\n days: [\"Sunday\", \"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\"],\n shortDays: [\"Sun\", \"Mon\", \"Tue\", \"Wed\", \"Thu\", \"Fri\", \"Sat\"],\n months: [\"January\", \"February\", \"March\", \"April\", \"May\", \"June\", \"July\", \"August\", \"September\", \"October\", \"November\", \"December\"],\n shortMonths: [\"Jan\", \"Feb\", \"Mar\", \"Apr\", \"May\", \"Jun\", \"Jul\", \"Aug\", \"Sep\", \"Oct\", \"Nov\", \"Dec\"]\n });\n\n function defaultLocale$1(definition) {\n locale$1 = formatLocale$1(definition);\n timeFormat = locale$1.format;\n timeParse = locale$1.parse;\n utcFormat = locale$1.utcFormat;\n utcParse = locale$1.utcParse;\n return locale$1;\n }\n\n var isoSpecifier = \"%Y-%m-%dT%H:%M:%S.%LZ\";\n\n function formatIsoNative(date) {\n return date.toISOString();\n }\n\n var formatIso = Date.prototype.toISOString\n ? formatIsoNative\n : utcFormat(isoSpecifier);\n\n function parseIsoNative(string) {\n var date = new Date(string);\n return isNaN(date) ? null : date;\n }\n\n var parseIso = +new Date(\"2000-01-01T00:00:00.000Z\")\n ? parseIsoNative\n : utcParse(isoSpecifier);\n\n var noop = {value: function() {}};\n\n function dispatch() {\n for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {\n if (!(t = arguments[i] + \"\") || (t in _) || /[\\s.]/.test(t)) throw new Error(\"illegal type: \" + t);\n _[t] = [];\n }\n return new Dispatch(_);\n }\n\n function Dispatch(_) {\n this._ = _;\n }\n\n function parseTypenames(typenames, types) {\n return typenames.trim().split(/^|\\s+/).map(function(t) {\n var name = \"\", i = t.indexOf(\".\");\n if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);\n if (t && !types.hasOwnProperty(t)) throw new Error(\"unknown type: \" + t);\n return {type: t, name: name};\n });\n }\n\n Dispatch.prototype = dispatch.prototype = {\n constructor: Dispatch,\n on: function(typename, callback) {\n var _ = this._,\n T = parseTypenames(typename + \"\", _),\n t,\n i = -1,\n n = T.length;\n\n // If no callback was specified, return the callback of the given type and name.\n if (arguments.length < 2) {\n while (++i < n) if ((t = (typename = T[i]).type) && (t = get(_[t], typename.name))) return t;\n return;\n }\n\n // If a type was specified, set the callback for the given type and name.\n // Otherwise, if a null callback was specified, remove callbacks of the given name.\n if (callback != null && typeof callback !== \"function\") throw new Error(\"invalid callback: \" + callback);\n while (++i < n) {\n if (t = (typename = T[i]).type) _[t] = set(_[t], typename.name, callback);\n else if (callback == null) for (t in _) _[t] = set(_[t], typename.name, null);\n }\n\n return this;\n },\n copy: function() {\n var copy = {}, _ = this._;\n for (var t in _) copy[t] = _[t].slice();\n return new Dispatch(copy);\n },\n call: function(type, that) {\n if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];\n if (!this._.hasOwnProperty(type)) throw new Error(\"unknown type: \" + type);\n for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);\n },\n apply: function(type, that, args) {\n if (!this._.hasOwnProperty(type)) throw new Error(\"unknown type: \" + type);\n for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);\n }\n };\n\n function get(type, name) {\n for (var i = 0, n = type.length, c; i < n; ++i) {\n if ((c = type[i]).name === name) {\n return c.value;\n }\n }\n }\n\n function set(type, name, callback) {\n for (var i = 0, n = type.length; i < n; ++i) {\n if (type[i].name === name) {\n type[i] = noop, type = type.slice(0, i).concat(type.slice(i + 1));\n break;\n }\n }\n if (callback != null) type.push({name: name, value: callback});\n return type;\n }\n\n var xhtml = \"http://www.w3.org/1999/xhtml\";\n\n var namespaces = {\n svg: \"http://www.w3.org/2000/svg\",\n xhtml: xhtml,\n xlink: \"http://www.w3.org/1999/xlink\",\n xml: \"http://www.w3.org/XML/1998/namespace\",\n xmlns: \"http://www.w3.org/2000/xmlns/\"\n };\n\n function namespace(name) {\n var prefix = name += \"\", i = prefix.indexOf(\":\");\n if (i >= 0 && (prefix = name.slice(0, i)) !== \"xmlns\") name = name.slice(i + 1);\n return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;\n }\n\n function creatorInherit(name) {\n return function() {\n var document = this.ownerDocument,\n uri = this.namespaceURI;\n return uri === xhtml && document.documentElement.namespaceURI === xhtml\n ? document.createElement(name)\n : document.createElementNS(uri, name);\n };\n }\n\n function creatorFixed(fullname) {\n return function() {\n return this.ownerDocument.createElementNS(fullname.space, fullname.local);\n };\n }\n\n function creator(name) {\n var fullname = namespace(name);\n return (fullname.local\n ? creatorFixed\n : creatorInherit)(fullname);\n }\n\n function none() {}\n\n function selector(selector) {\n return selector == null ? none : function() {\n return this.querySelector(selector);\n };\n }\n\n function selection_select(select) {\n if (typeof select !== \"function\") select = selector(select);\n\n for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {\n if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {\n if (\"__data__\" in node) subnode.__data__ = node.__data__;\n subgroup[i] = subnode;\n }\n }\n }\n\n return new Selection(subgroups, this._parents);\n }\n\n function empty() {\n return [];\n }\n\n function selectorAll(selector) {\n return selector == null ? empty : function() {\n return this.querySelectorAll(selector);\n };\n }\n\n function selection_selectAll(select) {\n if (typeof select !== \"function\") select = selectorAll(select);\n\n for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {\n if (node = group[i]) {\n subgroups.push(select.call(node, node.__data__, i, group));\n parents.push(node);\n }\n }\n }\n\n return new Selection(subgroups, parents);\n }\n\n function matcher(selector) {\n return function() {\n return this.matches(selector);\n };\n }\n\n function selection_filter(match) {\n if (typeof match !== \"function\") match = matcher(match);\n\n for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {\n if ((node = group[i]) && match.call(node, node.__data__, i, group)) {\n subgroup.push(node);\n }\n }\n }\n\n return new Selection(subgroups, this._parents);\n }\n\n function sparse(update) {\n return new Array(update.length);\n }\n\n function selection_enter() {\n return new Selection(this._enter || this._groups.map(sparse), this._parents);\n }\n\n function EnterNode(parent, datum) {\n this.ownerDocument = parent.ownerDocument;\n this.namespaceURI = parent.namespaceURI;\n this._next = null;\n this._parent = parent;\n this.__data__ = datum;\n }\n\n EnterNode.prototype = {\n constructor: EnterNode,\n appendChild: function(child) { return this._parent.insertBefore(child, this._next); },\n insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },\n querySelector: function(selector) { return this._parent.querySelector(selector); },\n querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }\n };\n\n function constant$2(x) {\n return function() {\n return x;\n };\n }\n\n var keyPrefix = \"$\"; // Protect against keys like “__proto__”.\n\n function bindIndex(parent, group, enter, update, exit, data) {\n var i = 0,\n node,\n groupLength = group.length,\n dataLength = data.length;\n\n // Put any non-null nodes that fit into update.\n // Put any null nodes into enter.\n // Put any remaining data into enter.\n for (; i < dataLength; ++i) {\n if (node = group[i]) {\n node.__data__ = data[i];\n update[i] = node;\n } else {\n enter[i] = new EnterNode(parent, data[i]);\n }\n }\n\n // Put any non-null nodes that don’t fit into exit.\n for (; i < groupLength; ++i) {\n if (node = group[i]) {\n exit[i] = node;\n }\n }\n }\n\n function bindKey(parent, group, enter, update, exit, data, key) {\n var i,\n node,\n nodeByKeyValue = {},\n groupLength = group.length,\n dataLength = data.length,\n keyValues = new Array(groupLength),\n keyValue;\n\n // Compute the key for each node.\n // If multiple nodes have the same key, the duplicates are added to exit.\n for (i = 0; i < groupLength; ++i) {\n if (node = group[i]) {\n keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);\n if (keyValue in nodeByKeyValue) {\n exit[i] = node;\n } else {\n nodeByKeyValue[keyValue] = node;\n }\n }\n }\n\n // Compute the key for each datum.\n // If there a node associated with this key, join and add it to update.\n // If there is not (or the key is a duplicate), add it to enter.\n for (i = 0; i < dataLength; ++i) {\n keyValue = keyPrefix + key.call(parent, data[i], i, data);\n if (node = nodeByKeyValue[keyValue]) {\n update[i] = node;\n node.__data__ = data[i];\n nodeByKeyValue[keyValue] = null;\n } else {\n enter[i] = new EnterNode(parent, data[i]);\n }\n }\n\n // Add any remaining nodes that were not bound to data to exit.\n for (i = 0; i < groupLength; ++i) {\n if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {\n exit[i] = node;\n }\n }\n }\n\n function selection_data(value, key) {\n if (!value) {\n data = new Array(this.size()), j = -1;\n this.each(function(d) { data[++j] = d; });\n return data;\n }\n\n var bind = key ? bindKey : bindIndex,\n parents = this._parents,\n groups = this._groups;\n\n if (typeof value !== \"function\") value = constant$2(value);\n\n for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {\n var parent = parents[j],\n group = groups[j],\n groupLength = group.length,\n data = value.call(parent, parent && parent.__data__, j, parents),\n dataLength = data.length,\n enterGroup = enter[j] = new Array(dataLength),\n updateGroup = update[j] = new Array(dataLength),\n exitGroup = exit[j] = new Array(groupLength);\n\n bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);\n\n // Now connect the enter nodes to their following update node, such that\n // appendChild can insert the materialized enter node before this node,\n // rather than at the end of the parent node.\n for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {\n if (previous = enterGroup[i0]) {\n if (i0 >= i1) i1 = i0 + 1;\n while (!(next = updateGroup[i1]) && ++i1 < dataLength);\n previous._next = next || null;\n }\n }\n }\n\n update = new Selection(update, parents);\n update._enter = enter;\n update._exit = exit;\n return update;\n }\n\n function selection_exit() {\n return new Selection(this._exit || this._groups.map(sparse), this._parents);\n }\n\n function selection_join(onenter, onupdate, onexit) {\n var enter = this.enter(), update = this, exit = this.exit();\n enter = typeof onenter === \"function\" ? onenter(enter) : enter.append(onenter + \"\");\n if (onupdate != null) update = onupdate(update);\n if (onexit == null) exit.remove(); else onexit(exit);\n return enter && update ? enter.merge(update).order() : update;\n }\n\n function selection_merge(selection) {\n\n for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {\n for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {\n if (node = group0[i] || group1[i]) {\n merge[i] = node;\n }\n }\n }\n\n for (; j < m0; ++j) {\n merges[j] = groups0[j];\n }\n\n return new Selection(merges, this._parents);\n }\n\n function selection_order() {\n\n for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {\n for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {\n if (node = group[i]) {\n if (next && node.compareDocumentPosition(next) ^ 4) next.parentNode.insertBefore(node, next);\n next = node;\n }\n }\n }\n\n return this;\n }\n\n function selection_sort(compare) {\n if (!compare) compare = ascending$1;\n\n function compareNode(a, b) {\n return a && b ? compare(a.__data__, b.__data__) : !a - !b;\n }\n\n for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {\n for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {\n if (node = group[i]) {\n sortgroup[i] = node;\n }\n }\n sortgroup.sort(compareNode);\n }\n\n return new Selection(sortgroups, this._parents).order();\n }\n\n function ascending$1(a, b) {\n return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;\n }\n\n function selection_call() {\n var callback = arguments[0];\n arguments[0] = this;\n callback.apply(null, arguments);\n return this;\n }\n\n function selection_nodes() {\n var nodes = new Array(this.size()), i = -1;\n this.each(function() { nodes[++i] = this; });\n return nodes;\n }\n\n function selection_node() {\n\n for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {\n for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {\n var node = group[i];\n if (node) return node;\n }\n }\n\n return null;\n }\n\n function selection_size() {\n var size = 0;\n this.each(function() { ++size; });\n return size;\n }\n\n function selection_empty() {\n return !this.node();\n }\n\n function selection_each(callback) {\n\n for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {\n for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {\n if (node = group[i]) callback.call(node, node.__data__, i, group);\n }\n }\n\n return this;\n }\n\n function attrRemove(name) {\n return function() {\n this.removeAttribute(name);\n };\n }\n\n function attrRemoveNS(fullname) {\n return function() {\n this.removeAttributeNS(fullname.space, fullname.local);\n };\n }\n\n function attrConstant(name, value) {\n return function() {\n this.setAttribute(name, value);\n };\n }\n\n function attrConstantNS(fullname, value) {\n return function() {\n this.setAttributeNS(fullname.space, fullname.local, value);\n };\n }\n\n function attrFunction(name, value) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) this.removeAttribute(name);\n else this.setAttribute(name, v);\n };\n }\n\n function attrFunctionNS(fullname, value) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) this.removeAttributeNS(fullname.space, fullname.local);\n else this.setAttributeNS(fullname.space, fullname.local, v);\n };\n }\n\n function selection_attr(name, value) {\n var fullname = namespace(name);\n\n if (arguments.length < 2) {\n var node = this.node();\n return fullname.local\n ? node.getAttributeNS(fullname.space, fullname.local)\n : node.getAttribute(fullname);\n }\n\n return this.each((value == null\n ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === \"function\"\n ? (fullname.local ? attrFunctionNS : attrFunction)\n : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));\n }\n\n function defaultView(node) {\n return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node\n || (node.document && node) // node is a Window\n || node.defaultView; // node is a Document\n }\n\n function styleRemove(name) {\n return function() {\n this.style.removeProperty(name);\n };\n }\n\n function styleConstant(name, value, priority) {\n return function() {\n this.style.setProperty(name, value, priority);\n };\n }\n\n function styleFunction(name, value, priority) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) this.style.removeProperty(name);\n else this.style.setProperty(name, v, priority);\n };\n }\n\n function selection_style(name, value, priority) {\n return arguments.length > 1\n ? this.each((value == null\n ? styleRemove : typeof value === \"function\"\n ? styleFunction\n : styleConstant)(name, value, priority == null ? \"\" : priority))\n : styleValue(this.node(), name);\n }\n\n function styleValue(node, name) {\n return node.style.getPropertyValue(name)\n || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);\n }\n\n function propertyRemove(name) {\n return function() {\n delete this[name];\n };\n }\n\n function propertyConstant(name, value) {\n return function() {\n this[name] = value;\n };\n }\n\n function propertyFunction(name, value) {\n return function() {\n var v = value.apply(this, arguments);\n if (v == null) delete this[name];\n else this[name] = v;\n };\n }\n\n function selection_property(name, value) {\n return arguments.length > 1\n ? this.each((value == null\n ? propertyRemove : typeof value === \"function\"\n ? propertyFunction\n : propertyConstant)(name, value))\n : this.node()[name];\n }\n\n function classArray(string) {\n return string.trim().split(/^|\\s+/);\n }\n\n function classList(node) {\n return node.classList || new ClassList(node);\n }\n\n function ClassList(node) {\n this._node = node;\n this._names = classArray(node.getAttribute(\"class\") || \"\");\n }\n\n ClassList.prototype = {\n add: function(name) {\n var i = this._names.indexOf(name);\n if (i < 0) {\n this._names.push(name);\n this._node.setAttribute(\"class\", this._names.join(\" \"));\n }\n },\n remove: function(name) {\n var i = this._names.indexOf(name);\n if (i >= 0) {\n this._names.splice(i, 1);\n this._node.setAttribute(\"class\", this._names.join(\" \"));\n }\n },\n contains: function(name) {\n return this._names.indexOf(name) >= 0;\n }\n };\n\n function classedAdd(node, names) {\n var list = classList(node), i = -1, n = names.length;\n while (++i < n) list.add(names[i]);\n }\n\n function classedRemove(node, names) {\n var list = classList(node), i = -1, n = names.length;\n while (++i < n) list.remove(names[i]);\n }\n\n function classedTrue(names) {\n return function() {\n classedAdd(this, names);\n };\n }\n\n function classedFalse(names) {\n return function() {\n classedRemove(this, names);\n };\n }\n\n function classedFunction(names, value) {\n return function() {\n (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);\n };\n }\n\n function selection_classed(name, value) {\n var names = classArray(name + \"\");\n\n if (arguments.length < 2) {\n var list = classList(this.node()), i = -1, n = names.length;\n while (++i < n) if (!list.contains(names[i])) return false;\n return true;\n }\n\n return this.each((typeof value === \"function\"\n ? classedFunction : value\n ? classedTrue\n : classedFalse)(names, value));\n }\n\n function textRemove() {\n this.textContent = \"\";\n }\n\n function textConstant(value) {\n return function() {\n this.textContent = value;\n };\n }\n\n function textFunction(value) {\n return function() {\n var v = value.apply(this, arguments);\n this.textContent = v == null ? \"\" : v;\n };\n }\n\n function selection_text(value) {\n return arguments.length\n ? this.each(value == null\n ? textRemove : (typeof value === \"function\"\n ? textFunction\n : textConstant)(value))\n : this.node().textContent;\n }\n\n function htmlRemove() {\n this.innerHTML = \"\";\n }\n\n function htmlConstant(value) {\n return function() {\n this.innerHTML = value;\n };\n }\n\n function htmlFunction(value) {\n return function() {\n var v = value.apply(this, arguments);\n this.innerHTML = v == null ? \"\" : v;\n };\n }\n\n function selection_html(value) {\n return arguments.length\n ? this.each(value == null\n ? htmlRemove : (typeof value === \"function\"\n ? htmlFunction\n : htmlConstant)(value))\n : this.node().innerHTML;\n }\n\n function raise() {\n if (this.nextSibling) this.parentNode.appendChild(this);\n }\n\n function selection_raise() {\n return this.each(raise);\n }\n\n function lower() {\n if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);\n }\n\n function selection_lower() {\n return this.each(lower);\n }\n\n function selection_append(name) {\n var create = typeof name === \"function\" ? name : creator(name);\n return this.select(function() {\n return this.appendChild(create.apply(this, arguments));\n });\n }\n\n function constantNull() {\n return null;\n }\n\n function selection_insert(name, before) {\n var create = typeof name === \"function\" ? name : creator(name),\n select = before == null ? constantNull : typeof before === \"function\" ? before : selector(before);\n return this.select(function() {\n return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);\n });\n }\n\n function remove() {\n var parent = this.parentNode;\n if (parent) parent.removeChild(this);\n }\n\n function selection_remove() {\n return this.each(remove);\n }\n\n function selection_cloneShallow() {\n var clone = this.cloneNode(false), parent = this.parentNode;\n return parent ? parent.insertBefore(clone, this.nextSibling) : clone;\n }\n\n function selection_cloneDeep() {\n var clone = this.cloneNode(true), parent = this.parentNode;\n return parent ? parent.insertBefore(clone, this.nextSibling) : clone;\n }\n\n function selection_clone(deep) {\n return this.select(deep ? selection_cloneDeep : selection_cloneShallow);\n }\n\n function selection_datum(value) {\n return arguments.length\n ? this.property(\"__data__\", value)\n : this.node().__data__;\n }\n\n var filterEvents = {};\n\n var event = null;\n\n if (typeof document !== \"undefined\") {\n var element = document.documentElement;\n if (!(\"onmouseenter\" in element)) {\n filterEvents = {mouseenter: \"mouseover\", mouseleave: \"mouseout\"};\n }\n }\n\n function filterContextListener(listener, index, group) {\n listener = contextListener(listener, index, group);\n return function(event) {\n var related = event.relatedTarget;\n if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {\n listener.call(this, event);\n }\n };\n }\n\n function contextListener(listener, index, group) {\n return function(event1) {\n var event0 = event; // Events can be reentrant (e.g., focus).\n event = event1;\n try {\n listener.call(this, this.__data__, index, group);\n } finally {\n event = event0;\n }\n };\n }\n\n function parseTypenames$1(typenames) {\n return typenames.trim().split(/^|\\s+/).map(function(t) {\n var name = \"\", i = t.indexOf(\".\");\n if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);\n return {type: t, name: name};\n });\n }\n\n function onRemove(typename) {\n return function() {\n var on = this.__on;\n if (!on) return;\n for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {\n if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {\n this.removeEventListener(o.type, o.listener, o.capture);\n } else {\n on[++i] = o;\n }\n }\n if (++i) on.length = i;\n else delete this.__on;\n };\n }\n\n function onAdd(typename, value, capture) {\n var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;\n return function(d, i, group) {\n var on = this.__on, o, listener = wrap(value, i, group);\n if (on) for (var j = 0, m = on.length; j < m; ++j) {\n if ((o = on[j]).type === typename.type && o.name === typename.name) {\n this.removeEventListener(o.type, o.listener, o.capture);\n this.addEventListener(o.type, o.listener = listener, o.capture = capture);\n o.value = value;\n return;\n }\n }\n this.addEventListener(typename.type, listener, capture);\n o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};\n if (!on) this.__on = [o];\n else on.push(o);\n };\n }\n\n function selection_on(typename, value, capture) {\n var typenames = parseTypenames$1(typename + \"\"), i, n = typenames.length, t;\n\n if (arguments.length < 2) {\n var on = this.node().__on;\n if (on) for (var j = 0, m = on.length, o; j < m; ++j) {\n for (i = 0, o = on[j]; i < n; ++i) {\n if ((t = typenames[i]).type === o.type && t.name === o.name) {\n return o.value;\n }\n }\n }\n return;\n }\n\n on = value ? onAdd : onRemove;\n if (capture == null) capture = false;\n for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));\n return this;\n }\n\n function customEvent(event1, listener, that, args) {\n var event0 = event;\n event1.sourceEvent = event;\n event = event1;\n try {\n return listener.apply(that, args);\n } finally {\n event = event0;\n }\n }\n\n function dispatchEvent(node, type, params) {\n var window = defaultView(node),\n event = window.CustomEvent;\n\n if (typeof event === \"function\") {\n event = new event(type, params);\n } else {\n event = window.document.createEvent(\"Event\");\n if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;\n else event.initEvent(type, false, false);\n }\n\n node.dispatchEvent(event);\n }\n\n function dispatchConstant(type, params) {\n return function() {\n return dispatchEvent(this, type, params);\n };\n }\n\n function dispatchFunction(type, params) {\n return function() {\n return dispatchEvent(this, type, params.apply(this, arguments));\n };\n }\n\n function selection_dispatch(type, params) {\n return this.each((typeof params === \"function\"\n ? dispatchFunction\n : dispatchConstant)(type, params));\n }\n\n var root = [null];\n\n function Selection(groups, parents) {\n this._groups = groups;\n this._parents = parents;\n }\n\n function selection() {\n return new Selection([[document.documentElement]], root);\n }\n\n Selection.prototype = selection.prototype = {\n constructor: Selection,\n select: selection_select,\n selectAll: selection_selectAll,\n filter: selection_filter,\n data: selection_data,\n enter: selection_enter,\n exit: selection_exit,\n join: selection_join,\n merge: selection_merge,\n order: selection_order,\n sort: selection_sort,\n call: selection_call,\n nodes: selection_nodes,\n node: selection_node,\n size: selection_size,\n empty: selection_empty,\n each: selection_each,\n attr: selection_attr,\n style: selection_style,\n property: selection_property,\n classed: selection_classed,\n text: selection_text,\n html: selection_html,\n raise: selection_raise,\n lower: selection_lower,\n append: selection_append,\n insert: selection_insert,\n remove: selection_remove,\n clone: selection_clone,\n datum: selection_datum,\n on: selection_on,\n dispatch: selection_dispatch\n };\n\n function select(selector) {\n return typeof selector === \"string\"\n ? new Selection([[document.querySelector(selector)]], [document.documentElement])\n : new Selection([[selector]], root);\n }\n\n function sourceEvent() {\n var current = event, source;\n while (source = current.sourceEvent) current = source;\n return current;\n }\n\n function point(node, event) {\n var svg = node.ownerSVGElement || node;\n\n if (svg.createSVGPoint) {\n var point = svg.createSVGPoint();\n point.x = event.clientX, point.y = event.clientY;\n point = point.matrixTransform(node.getScreenCTM().inverse());\n return [point.x, point.y];\n }\n\n var rect = node.getBoundingClientRect();\n return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];\n }\n\n function mouse(node) {\n var event = sourceEvent();\n if (event.changedTouches) event = event.changedTouches[0];\n return point(node, event);\n }\n\n function touch(node, touches, identifier) {\n if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;\n\n for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {\n if ((touch = touches[i]).identifier === identifier) {\n return point(node, touch);\n }\n }\n\n return null;\n }\n\n function nopropagation() {\n event.stopImmediatePropagation();\n }\n\n function noevent() {\n event.preventDefault();\n event.stopImmediatePropagation();\n }\n\n function nodrag(view) {\n var root = view.document.documentElement,\n selection = select(view).on(\"dragstart.drag\", noevent, true);\n if (\"onselectstart\" in root) {\n selection.on(\"selectstart.drag\", noevent, true);\n } else {\n root.__noselect = root.style.MozUserSelect;\n root.style.MozUserSelect = \"none\";\n }\n }\n\n function yesdrag(view, noclick) {\n var root = view.document.documentElement,\n selection = select(view).on(\"dragstart.drag\", null);\n if (noclick) {\n selection.on(\"click.drag\", noevent, true);\n setTimeout(function() { selection.on(\"click.drag\", null); }, 0);\n }\n if (\"onselectstart\" in root) {\n selection.on(\"selectstart.drag\", null);\n } else {\n root.style.MozUserSelect = root.__noselect;\n delete root.__noselect;\n }\n }\n\n function constant$3(x) {\n return function() {\n return x;\n };\n }\n\n function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {\n this.target = target;\n this.type = type;\n this.subject = subject;\n this.identifier = id;\n this.active = active;\n this.x = x;\n this.y = y;\n this.dx = dx;\n this.dy = dy;\n this._ = dispatch;\n }\n\n DragEvent.prototype.on = function() {\n var value = this._.on.apply(this._, arguments);\n return value === this._ ? this : value;\n };\n\n // Ignore right-click, since that should open the context menu.\n function defaultFilter() {\n return !event.ctrlKey && !event.button;\n }\n\n function defaultContainer() {\n return this.parentNode;\n }\n\n function defaultSubject(d) {\n return d == null ? {x: event.x, y: event.y} : d;\n }\n\n function defaultTouchable() {\n return navigator.maxTouchPoints || (\"ontouchstart\" in this);\n }\n\n function drag() {\n var filter = defaultFilter,\n container = defaultContainer,\n subject = defaultSubject,\n touchable = defaultTouchable,\n gestures = {},\n listeners = dispatch(\"start\", \"drag\", \"end\"),\n active = 0,\n mousedownx,\n mousedowny,\n mousemoving,\n touchending,\n clickDistance2 = 0;\n\n function drag(selection) {\n selection\n .on(\"mousedown.drag\", mousedowned)\n .filter(touchable)\n .on(\"touchstart.drag\", touchstarted)\n .on(\"touchmove.drag\", touchmoved)\n .on(\"touchend.drag touchcancel.drag\", touchended)\n .style(\"touch-action\", \"none\")\n .style(\"-webkit-tap-highlight-color\", \"rgba(0,0,0,0)\");\n }\n\n function mousedowned() {\n if (touchending || !filter.apply(this, arguments)) return;\n var gesture = beforestart(\"mouse\", container.apply(this, arguments), mouse, this, arguments);\n if (!gesture) return;\n select(event.view).on(\"mousemove.drag\", mousemoved, true).on(\"mouseup.drag\", mouseupped, true);\n nodrag(event.view);\n nopropagation();\n mousemoving = false;\n mousedownx = event.clientX;\n mousedowny = event.clientY;\n gesture(\"start\");\n }\n\n function mousemoved() {\n noevent();\n if (!mousemoving) {\n var dx = event.clientX - mousedownx, dy = event.clientY - mousedowny;\n mousemoving = dx * dx + dy * dy > clickDistance2;\n }\n gestures.mouse(\"drag\");\n }\n\n function mouseupped() {\n select(event.view).on(\"mousemove.drag mouseup.drag\", null);\n yesdrag(event.view, mousemoving);\n noevent();\n gestures.mouse(\"end\");\n }\n\n function touchstarted() {\n if (!filter.apply(this, arguments)) return;\n var touches = event.changedTouches,\n c = container.apply(this, arguments),\n n = touches.length, i, gesture;\n\n for (i = 0; i < n; ++i) {\n if (gesture = beforestart(touches[i].identifier, c, touch, this, arguments)) {\n nopropagation();\n gesture(\"start\");\n }\n }\n }\n\n function touchmoved() {\n var touches = event.changedTouches,\n n = touches.length, i, gesture;\n\n for (i = 0; i < n; ++i) {\n if (gesture = gestures[touches[i].identifier]) {\n noevent();\n gesture(\"drag\");\n }\n }\n }\n\n function touchended() {\n var touches = event.changedTouches,\n n = touches.length, i, gesture;\n\n if (touchending) clearTimeout(touchending);\n touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!\n for (i = 0; i < n; ++i) {\n if (gesture = gestures[touches[i].identifier]) {\n nopropagation();\n gesture(\"end\");\n }\n }\n }\n\n function beforestart(id, container, point, that, args) {\n var p = point(container, id), s, dx, dy,\n sublisteners = listeners.copy();\n\n if (!customEvent(new DragEvent(drag, \"beforestart\", s, id, active, p[0], p[1], 0, 0, sublisteners), function() {\n if ((event.subject = s = subject.apply(that, args)) == null) return false;\n dx = s.x - p[0] || 0;\n dy = s.y - p[1] || 0;\n return true;\n })) return;\n\n return function gesture(type) {\n var p0 = p, n;\n switch (type) {\n case \"start\": gestures[id] = gesture, n = active++; break;\n case \"end\": delete gestures[id], --active; // nobreak\n case \"drag\": p = point(container, id), n = active; break;\n }\n customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);\n };\n }\n\n drag.filter = function(_) {\n return arguments.length ? (filter = typeof _ === \"function\" ? _ : constant$3(!!_), drag) : filter;\n };\n\n drag.container = function(_) {\n return arguments.length ? (container = typeof _ === \"function\" ? _ : constant$3(_), drag) : container;\n };\n\n drag.subject = function(_) {\n return arguments.length ? (subject = typeof _ === \"function\" ? _ : constant$3(_), drag) : subject;\n };\n\n drag.touchable = function(_) {\n return arguments.length ? (touchable = typeof _ === \"function\" ? _ : constant$3(!!_), drag) : touchable;\n };\n\n drag.on = function() {\n var value = listeners.on.apply(listeners, arguments);\n return value === listeners ? drag : value;\n };\n\n drag.clickDistance = function(_) {\n return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);\n };\n\n return drag;\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const T$a = Template('d-slider', `\n\n\n
          \n
          \n
          \n
          \n
          \n
          \n
          \n
          \n
          \n`);\n\n // ARIA\n // If the slider has a visible label, it is referenced by aria-labelledby on the slider element. Otherwise, the slider element has a label provided by aria-label.\n // If the slider is vertically oriented, it has aria-orientation set to vertical. The default value of aria-orientation for a slider is horizontal.\n\n const keyCodes = {\n left: 37,\n up: 38,\n right: 39,\n down: 40,\n pageUp: 33,\n pageDown: 34,\n end: 35,\n home: 36\n };\n\n class Slider extends T$a(HTMLElement) {\n\n\n connectedCallback() {\n this.connected = true;\n this.setAttribute('role', 'slider');\n // Makes the element tab-able.\n if (!this.hasAttribute('tabindex')) { this.setAttribute('tabindex', 0); }\n\n // Keeps track of keyboard vs. mouse interactions for focus rings\n this.mouseEvent = false;\n\n // Handles to shadow DOM elements\n this.knob = this.root.querySelector('.knob-container');\n this.background = this.root.querySelector('.background');\n this.trackFill = this.root.querySelector('.track-fill');\n this.track = this.root.querySelector('.track');\n\n // Default values for attributes\n this.min = this.min ? this.min : 0;\n this.max = this.max ? this.max : 100;\n this.scale = linear$1().domain([this.min, this.max]).range([0, 1]).clamp(true);\n\n this.origin = this.origin !== undefined ? this.origin : this.min;\n this.step = this.step ? this.step : 1;\n this.update(this.value ? this.value : 0);\n\n this.ticks = this.ticks ? this.ticks : false;\n this.renderTicks();\n\n this.drag = drag()\n .container(this.background)\n .on('start', () => {\n this.mouseEvent = true;\n this.background.classList.add('mousedown');\n this.changeValue = this.value;\n this.dragUpdate();\n })\n .on('drag', () => {\n this.dragUpdate();\n })\n .on('end', () => {\n this.mouseEvent = false;\n this.background.classList.remove('mousedown');\n this.dragUpdate();\n if (this.changeValue !== this.value) this.dispatchChange();\n this.changeValue = this.value;\n });\n this.drag(select(this.background));\n\n this.addEventListener('focusin', () => {\n if(!this.mouseEvent) {\n this.background.classList.add('focus');\n }\n });\n this.addEventListener('focusout', () => {\n this.background.classList.remove('focus');\n });\n this.addEventListener('keydown', this.onKeyDown);\n\n }\n\n static get observedAttributes() {return ['min', 'max', 'value', 'step', 'ticks', 'origin', 'tickValues', 'tickLabels']; }\n\n attributeChangedCallback(attr, oldValue, newValue) {\n if (isNaN(newValue) || newValue === undefined || newValue === null) return;\n if (attr == 'min') {\n this.min = +newValue;\n this.setAttribute('aria-valuemin', this.min);\n }\n if (attr == 'max') {\n this.max = +newValue;\n this.setAttribute('aria-valuemax', this.max);\n }\n if (attr == 'value') {\n this.update(+newValue);\n }\n if (attr == 'origin') {\n this.origin = +newValue;\n // this.update(this.value);\n }\n if (attr == 'step') {\n if (newValue > 0) {\n this.step = +newValue;\n }\n }\n if (attr == 'ticks') {\n this.ticks = (newValue === '' ? true : newValue);\n }\n }\n\n onKeyDown(event) {\n this.changeValue = this.value;\n let stopPropagation = false;\n switch (event.keyCode) {\n case keyCodes.left:\n case keyCodes.down:\n this.update(this.value - this.step);\n stopPropagation = true;\n break;\n case keyCodes.right:\n case keyCodes.up:\n this.update(this.value + this.step);\n stopPropagation = true;\n break;\n case keyCodes.pageUp:\n this.update(this.value + this.step * 10);\n stopPropagation = true;\n break;\n\n case keyCodes.pageDown:\n this.update(this.value + this.step * 10);\n stopPropagation = true;\n break;\n case keyCodes.home:\n this.update(this.min);\n stopPropagation = true;\n break;\n case keyCodes.end:\n this.update(this.max);\n stopPropagation = true;\n break;\n }\n if (stopPropagation) {\n this.background.classList.add('focus');\n event.preventDefault();\n event.stopPropagation();\n if (this.changeValue !== this.value) this.dispatchChange();\n }\n }\n\n validateValueRange(min, max, value) {\n return Math.max(Math.min(max, value), min);\n }\n\n quantizeValue(value, step) {\n return Math.round(value / step) * step;\n }\n\n dragUpdate() {\n const bbox = this.background.getBoundingClientRect();\n const x = event.x;\n const width = bbox.width;\n this.update(this.scale.invert(x / width));\n }\n\n update(value) {\n let v = value;\n if (this.step !== 'any') {\n v = this.quantizeValue(value, this.step);\n }\n v = this.validateValueRange(this.min, this.max, v);\n if (this.connected) {\n this.knob.style.left = this.scale(v) * 100 + '%';\n this.trackFill.style.width = this.scale(this.min + Math.abs(v - this.origin)) * 100 + '%';\n this.trackFill.style.left = this.scale(Math.min(v, this.origin)) * 100 + '%';\n }\n if (this.value !== v) {\n this.value = v;\n this.setAttribute('aria-valuenow', this.value);\n this.dispatchInput();\n }\n }\n\n // Dispatches only on a committed change (basically only on mouseup).\n dispatchChange() {\n const e = new Event('change');\n this.dispatchEvent(e, {});\n }\n\n // Dispatches on each value change.\n dispatchInput() {\n const e = new Event('input');\n this.dispatchEvent(e, {});\n }\n\n renderTicks() {\n const ticksContainer = this.root.querySelector('.ticks');\n if (this.ticks !== false) {\n let tickData = [];\n if (this.ticks > 0) {\n tickData = this.scale.ticks(this.ticks);\n } else if (this.step === 'any') {\n tickData = this.scale.ticks();\n } else {\n tickData = range(this.min, this.max + 1e-6, this.step);\n }\n tickData.forEach(d => {\n const tick = document.createElement('div');\n tick.classList.add('tick');\n tick.style.left = this.scale(d) * 100 + '%';\n ticksContainer.appendChild(tick);\n });\n } else {\n ticksContainer.style.display = 'none';\n }\n }\n }\n\n var logo = \"\\n \\n\\n\";\n\n const headerTemplate = `\n\n
          \n \n ${logo}\n Distill\n \n \n
          \n`;\n\n // Copyright 2018 The Distill Template Authors\n\n const T$b = Template('distill-header', headerTemplate, false);\n\n class DistillHeader extends T$b(HTMLElement) {\n\n }\n\n // Copyright 2018 The Distill Template Authors\n\n const styles$2 = `\n\n`;\n\n function appendixTemplate(frontMatter) {\n let html = styles$2;\n\n if (typeof frontMatter.githubUrl !== 'undefined') {\n html += `\n

          Updates and Corrections

          \n

          `;\n if (frontMatter.githubCompareUpdatesUrl) {\n html += `View all changes to this article since it was first published.`;\n }\n html += `\n If you see mistakes or want to suggest changes, please create an issue on GitHub.

          \n `;\n }\n\n const journal = frontMatter.journal;\n if (typeof journal !== 'undefined' && journal.title === 'Distill') {\n html += `\n

          Reuse

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b50920e138807f385d0b0359f4f0f09891f18406..0000000000000000000000000000000000000000 Binary files a/dist/fe2176f79edaa716e621.woff2 and /dev/null differ diff --git a/dist/index.html b/dist/index.html index 15806df26ddd3ef0e390b23f7d2ab936c84a22bd..15e0df18083eb2dce4ad406c0673556b5ba40745 100644 --- a/dist/index.html +++ b/dist/index.html @@ -8,6 +8,14 @@ FineWeb: decanting the web for the finest text data at scale + @@ -60,12 +68,68 @@ +
          + + + +
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          TLDR: This blog covers a discussion on processing and evaluating data quality at scale, the 🍷 FineWeb recipe (listing and explaining all of our design choices), and the process followed to create its 📚 FineWeb-Edu subset.

          Scaling Models and Hardware

          -

          Now that we know the basics of distributed communication and computations it’s time to apply this to training LLMs at scale. Here’s the plan of action: we’ll go through increasingly complex distribution strategies, namely data, then tensor and finally pipeline parallelism, and show three things:

          +

          Now that we know the basics of distributed communication and computations it's time to apply this to training LLMs at scale. Here's the plan of action: we'll go through increasingly complex distribution strategies, namely data, then tensor and finally pipeline parallelism, and show three things:

          1. conceptual explanations with diagrams
            2. @@ -75,7 +139,7 @@

            For the experiments we scale across two dimensions: we make the models larger and larger and add more and more compute nodes and measure how throughput changes.

            -

            So this is a good point to get ☕ #2 and we’ll have a look at the setup for the practical experiments.

            +

            So this is a good point to get ☕ #2 and we'll have a look at the setup for the practical experiments.

            Experiment setup

            @@ -127,12 +191,12 @@

            Efficiently training LLMs now requires amounts of compute which exceed in most case single GPUs or machine. Large distributed clusters are thus used to train these models and can range from hundreds to thousands of nodes each usually equipped with up to 8 GPUs. To make the best use of such an expensive hardware, a range of distributed training methods have been developed with the goal of ensuring that GPUs are highly utilized at all times and not waiting for data/synchronization/etc.

            -

            Several methods can be used to distribute training and we’ll start with 4D parallelism followed-up by DeepSpeed stages. While we explain these strategies we’ll also run experiments to determine the trade-offs and understand the optimal settings.

            -

            The name “4D parallelism” originates from the fact that it involves combining up to 4 distribution methods: data, tensor, pipeline, and sequence parallelism (each of these techniques can be used independently of the other). You may thus ask “So which one should I use?”.

            +

            Several methods can be used to distribute training and we'll start with 4D parallelism followed-up by DeepSpeed stages. While we explain these strategies we'll also run experiments to determine the trade-offs and understand the optimal settings.

            +

            The name "4D parallelism" originates from the fact that it involves combining up to 4 distribution methods: data, tensor, pipeline, and sequence parallelism (each of these techniques can be used independently of the other). You may thus ask "So which one should I use?".

            -

            Unfortunately, there is no universal answer as the response will actually depend on the cluster setup as well as the model architecture. But do not despair for in this section we’ll develop strategies to figure out the best setting experimentally!

            +

            Unfortunately, there is no universal answer as the response will actually depend on the cluster setup as well as the model architecture. But do not despair for in this section we'll develop strategies to figure out the best setting experimentally!

            -

            In addition to 4D parallelism we’ll also take a look at “DeepSpeed”, a method developed by Microsoft which is generally complimentary to 4D parallelism and can be leveraged on top of it.

            +

            In addition to 4D parallelism we'll also take a look at "DeepSpeed", a method developed by Microsoft which is generally complimentary to 4D parallelism and can be leveraged on top of it.

            Idea: show two things in every section

              @@ -142,14 +206,15 @@

              No Parallelism

              -

              Let’s quickly go over the basics before going into distributed training. When a model is trained on a single GPU, the training consists of 3 steps in the simplest case:

              +

              Let's quickly go over the basics before going into distributed training. When a model is trained on a single GPU, the training consists of 3 steps in the simplest case:

              1. one forward pass,
              2. one backward pass to compute the gradients, and
              3. an optimization step using the gradients to update the parameters
              -

              As we’ll see in the future, these steps may be repeated or intertwined but for now we’ll start simple:

              +

              As we'll see in the future, these steps may be repeated or intertwined but for now we'll start simple:

              +

              As we'll see in the future, these steps may be repeated or intertwined but for now we'll start simple:

              Training Steps @@ -157,9 +222,9 @@

              The batch size (bs) is one of the most important hyper-parameters in machine learning, affecting both model convergence and throughput.

              -

              If the batch size is too small, gradients will tend to be noisy and the model may not be able to converge to optimal performances while a batch size too large can make the convergence of the model slower and waste compute. You can find a nice discussion of this topic in OpenAI’s paper on large batch training (https://arxiv.org/pdf/1812.06162).

              +

              If the batch size is too small, gradients will tend to be noisy and the model may not be able to converge to optimal performances while a batch size too large can make the convergence of the model slower and waste compute. You can find a nice discussion of this topic in OpenAI's paper on large batch training (https://arxiv.org/pdf/1812.06162).

              -

              The batch size also affects the throughput: a small batch size will require more optimizer steps to train on a given amount of samples. Optimizer steps are costly (in compute time) and the throughput will thus be lower than when using a larger batch size. On the other hand, larger batches, while leading to higher throughput may suffer from slow convergence in the limits as we’ve just seen. There is generally an optimal batch size from a convergence/performance point of view (note that the batch size can usually still be changed around the optimal batch size without major impact to the performance of the model).

              +

              The batch size also affects the throughput: a small batch size will require more optimizer steps to train on a given amount of samples. Optimizer steps are costly (in compute time) and the throughput will thus be lower than when using a larger batch size. On the other hand, larger batches, while leading to higher throughput may suffer from slow convergence in the limits as we've just seen. There is generally an optimal batch size from a convergence/performance point of view (note that the batch size can usually still be changed around the optimal batch size without major impact to the performance of the model).

              Note that in the LLM community, batch sizes are commonly reported in terms of tokens instead of number of samples (BST - Batch Size Tokens) as each token has a label and thus a loss term and can thus be considered individual (although highly correlated) samples.

              @@ -169,17 +234,17 @@ bst=bs *seq -

              (note that from here on forward we’ll show the formulas for the batch size in number of samples but you can always get its token-unit counterpart by multiplying it with the sequence length)

              +

              (note that from here on forward we'll show the formulas for the batch size in number of samples but you can always get its token-unit counterpart by multiplying it with the sequence length)

              -

              And we’re now hitting our first scaling problem:

              +

              And we're now hitting our first scaling problem:

              -

              what if we can’t fit the model into GPU memory even with BS=1?

              +

              what if we can't fit the model into GPU memory even with BS=1?

              Good question, reader!

              -

              Let’s start by understanding what led to our out-of-memory issue in the first place.

              +

              Let's start by understanding what led to our out-of-memory issue in the first place.

              A brief overview of memory usage in Transformers

              @@ -190,22 +255,22 @@ bst=bs *seq
            1. optimizer states
            2. activations computed during the forward pass and which are needed to compute the backward pass
            3. also CUDA Kernels require 1-2GB of GPU memory which you can quickly check yourself by running import torch; torch.ones((1, 1)).to("cuda") and then checking the GPU memory with nvidia-smi
              4. -
            4. lower rest memory usage from buffers, intermediate results and some memory that can’t be used due to fragmentation
              5. +
            5. lower rest memory usage from buffers, intermediate results and some memory that can't be used due to fragmentation
              6. -

              Scaling up training is usually a question of playing with those constituents to keep memory low while not impacting performance too much. We’ll neglect the last two contributors as there’s usually not that much you can do about them unless you dive deep in the code.

              +

              Scaling up training is usually a question of playing with those constituents to keep memory low while not impacting performance too much. We'll neglect the last two contributors as there's usually not that much you can do about them unless you dive deep in the code.

              -

              For the rest, they are usually different types of tensors that can have various sizes (usually multiples of one or several of batch size, sequence length, model hidden dimension and some potential sharding) and various precisions (with optimizer states and weights copy being often kept in full FP32 precision while activations can be of lower precision like BF16 or FP8). Let’s try to get some intuition for the memory requirement of these various elements.

              +

              For the rest, they are usually different types of tensors that can have various sizes (usually multiples of one or several of batch size, sequence length, model hidden dimension and some potential sharding) and various precisions (with optimizer states and weights copy being often kept in full FP32 precision while activations can be of lower precision like BF16 or FP8). Let's try to get some intuition for the memory requirement of these various elements.

              -

              Let’s first look at the weights, gradients and optimizer states. They are all dependent on the number of parameters in a model. For a simple LLM the number of parameters is given by the following formula:

              +

              Let's first look at the weights, gradients and optimizer states. They are all dependent on the number of parameters in a model. For a simple LLM the number of parameters is given by the following formula:

              N = h*v + L * (12 * h^2 + 13*h) + 2*h -

              In that equation, h corresponds to the hidden dimension, v to the vocabulary size, and L the number of layers in the model. Note that looking at the equation we can see that the term that will dominate at large model scales is the one with h^2 since it’s the only term growing quadratically as we scale the models.

              +

              In that equation, h corresponds to the hidden dimension, v to the vocabulary size, and L the number of layers in the model. Note that looking at the equation we can see that the term that will dominate at large model scales is the one with h^2 since it's the only term growing quadratically as we scale the models.

              -

              Let’s see how the number of parameters translates to memory usage. The memory requirements for the parameters and gradients are the number of parameters multiplied by the number of bytes per parameter. Mixed precision training with BF16 is the default nowadays which requires 2 bytes per parameter. In addition, there are a number of values necessary for the optimizer states: for ADAM it requires the momentum and the variance in FP32, each using 4 bytes, and an additional copy of the model weights in FP32, thus 12 bytes per parameter (ref: ZeRO):

              +

              Let's see how the number of parameters translates to memory usage. The memory requirements for the parameters and gradients are the number of parameters multiplied by the number of bytes per parameter. Mixed precision training with BF16 is the default nowadays which requires 2 bytes per parameter. In addition, there are a number of values necessary for the optimizer states: for ADAM it requires the momentum and the variance in FP32, each using 4 bytes, and an additional copy of the model weights in FP32, thus 12 bytes per parameter (ref: ZeRO):

              m_{params} = 2 * N @@ -213,7 +278,7 @@ m_{grad} = 2 * N m_{opt} = (4+4+4) * N -

              In old-fashioned full precision training both parameters and gradients would require 4 bytes each but the optimizer on the other hand wouldn’t need to store an extra full precision copy of the weights:

              +

              In old-fashioned full precision training both parameters and gradients would require 4 bytes each but the optimizer on the other hand wouldn't need to store an extra full precision copy of the weights:

              m_{params} = 4 * N @@ -221,7 +286,8 @@ m_{grad} = 4 * N m_{opt} = (4+4) * N -

              So we can easily see that mixed precision itself doesn’t save memory as it just distributes the memory differently across the three components. So by multiplying the number of parameters by 16 (=2+2+12) you can quickly get a sense of how much GPU memory we need for a model:

              +

              So we can easily see that mixed precision itself doesn't save memory as it just distributes the memory differently across the three components. So by multiplying the number of parameters by 16 (=2+2+12) you can quickly get a sense of how much GPU memory we need for a model:

              +

              So we can easily see that mixed precision itself doesn't save memory as it just distributes the memory differently across the three components. So by multiplying the number of parameters by 16 (=2+2+12) you can quickly get a sense of how much GPU memory we need for a model:

              @@ -250,24 +316,24 @@ m_{opt} = (4+4) * N
              -

              We can further decrease the memory usage if we choose FP8 training instead of BF16 but it is much less stable and a very active research topic (see here) thus we won’t go in details here.

              +

              We can further decrease the memory usage if we choose FP8 training instead of BF16 but it is much less stable and a very active research topic (see here) thus we won't go in details here.

              -

              But we are not done yet, we’ll also need to store the forward pass activations which are used during the backward pass to compute the gradients. The total memory required for the activations in mixed precision (which contributes the leading factor of 2 below) is given by the following equation:

              +

              But we are not done yet, we'll also need to store the forward pass activations which are used during the backward pass to compute the gradients. The total memory required for the activations in mixed precision (which contributes the leading factor of 2 below) is given by the following equation:

              m_{act} = 2 * L* seq * bs * h * (34 + \frac{5*n_{heads}*seq}{h}) -

              You can follow this NVIDIA paper for a complete derivation, it essentially requires you to do some accounting of all the sizes of intermediate activations between each operation. What’s interesting here is that the memory is not static for a given model but depends critically on the sequence length. We can use the memory formulas and have a look how the memory usage changes for a model for various sequence lengths:

              +

              You can follow this NVIDIA paper for a complete derivation, it essentially requires you to do some accounting of all the sizes of intermediate activations between each operation. What's interesting here is that the memory is not static for a given model but depends critically on the sequence length. We can use the memory formulas and have a look how the memory usage changes for a model for various sequence lengths:

              Memory Usage Graph 1 Memory Usage Graph 2

              This graph tells a striking story: for short sequences, activations are almost negligible, but starting at around 2-4k tokens they start to take up a significant amount of memory while parameter, gradient and optimizer state are roughly independent of the sequence length and batch size. For large batch/sequence, activations however become by far the largest memory burden.

              -

              Is there a way to tame this “activation explosion”?

              +

              Is there a way to tame this "activation explosion"?

              -

              Good question, reader! I see you’re following well and you’re lucky as the answer is “Yes”! Let’s talk about a technique called gradient checkpointing or more frequently activation recomputation which can help us cap activation memory footprint and is an essential tool in today’s large model training toolbox.

              +

              Good question, reader! I see you're following well and you're lucky as the answer is "Yes"! Let's talk about a technique called gradient checkpointing or more frequently activation recomputation which can help us cap activation memory footprint and is an essential tool in today's large model training toolbox.

              Activation recomputation

              @@ -277,12 +343,13 @@ m_{act} = 2 * L* seq * bs * h * (34 + \frac{5*n_{heads}*seq}{h})

              We can select these key activations according to several strategies and modern frameworks usually choose among the following three strategies:

                -
              • None: We don’t recompute activations during the backward pass and keep all activations in memory. While this is the fastest and thus computationally cheapest option, it also requires the most memory.
                • +
              • None: We don't recompute activations during the backward pass and keep all activations in memory. While this is the fastest and thus computationally cheapest option, it also requires the most memory.
              • Full: The simplest strategy from a conceptual point of view is to checkpoint activations between each Transformer layer. This is usually called the full strategy since it requires a forward pass through each layer essentially adding a full forward pass during the backward pass. This strategy saves the most memory but is the most expensive one in terms of compute. This increases the compute cost by up to 30-40% which is very noticeable.
              • Selective: In general we can do better than full. The authors of this paper did a detailed analysis studying which activations grow the largest and have the cheapest recomputation cost in terms of FLOPs. Turns out that the attention computations fall in that category, and thus we can usually discard them and focus on checkpointing expensive feedforward computations. Note: for a GPT-3 (175B) model this means 70% activation memory reduction at a 2.7% compute cost.
              -

              Let’s see how recomputation strategies can drastically reduce the memory footprint while selective recomputation strikes a nice balance between memory saving and recomputation cost:

              +

              Let's see how recomputation strategies can drastically reduce the memory footprint while selective recomputation strikes a nice balance between memory saving and recomputation cost:

              +

              Let's see how recomputation strategies can drastically reduce the memory footprint while selective recomputation strikes a nice balance between memory saving and recomputation cost:

              Recomputation Strategies @@ -402,7 +469,7 @@ GeLU(XW1 + XW2) \neq GeLU(XW1) + GeLU(XW2)

              If you rather like code, note that we can prove this with the following snippet as well:

              -
              +
 def example_gelu():
     from torch.nn.functional import gelu
     
@@ -426,7 +493,7 @@ def example_gelu():
     
     # Mismatch
     torch.testing.assert_close(y_row_1, y_row_2, rtol=1e-5, atol=1e-5)
-
              +

              To avoid a synchronization step directly after the first MLP, we’ll thus start with Column Parallel and be able to directly perform parallel GELU.

              @@ -444,7 +511,7 @@ def example_gelu(): Backward Pass 1 Backward Pass 2 -
              +
 def column_linear_forward(X, local_W, group):
     Y_local = X @ local_W.t()
     return Y_local
@@ -517,7 +584,7 @@ if __name__ == "__main__":
     torch.cuda.set_device(int(os.environ["LOCAL_RANK"]))
 
     example_column_row_linear()
-
              +

              Now that we’ve found the most efficient schema for the Feedforward part of the transformer, let’s take a look at the multi-head attention block (MHA).

              @@ -746,7 +813,7 @@ x_{d-1}\cos mθ_{d/2-1} + x_{d-1}\sin mθ_{d/2-1} \\

              The angle of rotation, θi is defined as follows, where d is the dimension of the attention head:

              -θi = base-2(i-1)/d, i∈ [1,2,...,d/2] +θi = base-2(i-1)/d, i \in [1,2,...,d/2]

              How does this look? When moving the same distance, vectors in some dimensions rotate faster than vectors in other dimensions.

              Rotation Speed @@ -913,5 +980,6 @@ x_{d-1}\cos mθ_{d/2-1} + x_{d-1}\sin mθ_{d/2-1} \\ }); } + \ No newline at end of file diff --git a/dist/main.bundle.js b/dist/main.bundle.js index a3a9fa61080b996d741eb191c08bbd5ebd12c5d6..f533961331e72188898da391c574533fa30fab5c 100644 --- a/dist/main.bundle.js +++ b/dist/main.bundle.js @@ -1,3 +1,3 @@ /*! 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N=o?T(e,t):T(r,n);o?f?(B=e+N*A,I=-N*R):(B=t-N*A,I=N*R):f?(E=r+N*A,P=-N*R):(E=n-N*A,P=N*R)}return{textX:O,textY:D,targetX:B,targetY:E,anchorX:I,anchorY:P,scale:k,rotate:w}}e.exports={plot:function(e,t,r,f,g,v){var A=t.xaxis,D=t.yaxis,B=e._fullLayout,E=e._context.staticPlot;g||(g={mode:B.barmode,norm:B.barmode,gap:B.bargap,groupgap:B.bargroupgap},h("bar",B));var I=i.makeTraceGroups(f,r,"trace bars").each((function(r){var u=n.select(this),f=r[0].trace,h=r[0].t,I="waterfall"===f.type,P="funnel"===f.type,R="histogram"===f.type,N="bar"===f.type,F=N||P,H=0;I&&f.connector.visible&&"between"===f.connector.mode&&(H=f.connector.line.width/2);var j="h"===f.orientation,q=z(g),U=i.ensureSingle(u,"g","points"),V=w(f),Y=U.selectAll("g.point").data(i.identity,V);Y.enter().append("g").classed("point",!0),Y.exit().remove(),Y.each((function(u,w){var z,I,P=n.select(this),U=function(e,t,r,n){var a=[],i=[],o=n?t:r,l=n?r:t;return 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n=i(e),a=r.uniformtext.minsize,o=t.scale*t.fontSize;t.hide=o=0})),("funnelarea"===t.type?v:t.sort)&&i.sort((function(e,t){return t.v-e.v})),i[0]&&(i[0].vTotal=g),i},crossTraceCalc:function(e,t){var r=(t||{}).type;r||(r="pie");var n=e._fullLayout,a=e.calcdata,i=n[r+"colorway"],l=n["_"+r+"colormap"];n["extend"+r+"colors"]&&(i=s(i,o));for(var u=0,c=0;c0){l=!0;break}}l||(o=0)}return{hasLabels:r,hasValues:i,len:o}}function c(e,t,r,n,a){n("marker.line.width")&&n("marker.line.color",a?void 0:r.paper_bgcolor);var i=n("marker.colors");s(n,"marker.pattern",i),e.marker&&!t.marker.pattern.fgcolor&&(t.marker.pattern.fgcolor=e.marker.colors),t.marker.pattern.bgcolor||(t.marker.pattern.bgcolor=r.paper_bgcolor)}e.exports={handleLabelsAndValues:u,handleMarkerDefaults:c,supplyDefaults:function(e,t,r,n){function s(r,n){return a.coerce(e,t,i,r,n)}var f=u(s("labels"),s("values")),d=f.len;if(t._hasLabels=f.hasLabels,t._hasValues=f.hasValues,!t._hasLabels&&t._hasValues&&(s("label0"),s("dlabel")),d){t._length=d,c(e,t,n,s,!0),s("scalegroup");var h,p=s("text"),m=s("texttemplate");if(m||(h=s("textinfo",a.isArrayOrTypedArray(p)?"text+percent":"percent")),s("hovertext"),s("hovertemplate"),m||h&&"none"!==h){var g=s("textposition");l(e,t,n,s,g,{moduleHasSelected:!1,moduleHasUnselected:!1,moduleHasConstrain:!1,moduleHasCliponaxis:!1,moduleHasTextangle:!1,moduleHasInsideanchor:!1}),(Array.isArray(g)||"auto"===g||"outside"===g)&&s("automargin"),("inside"===g||"auto"===g||Array.isArray(g))&&s("insidetextorientation")}else"none"===h&&s("textposition","none");o(t,n,s);var v=s("hole");if(s("title.text")){var y=s("title.position",v?"middle center":"top center");v||"middle center"!==y||(t.title.position="top center"),a.coerceFont(s,"title.font",n.font)}s("sort"),s("direction"),s("rotation"),s("pull")}else t.visible=!1}}},3644:function(e,t,r){"use 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r=t._fullLayout,a=t._fullData[u.index];t._dragging||!1===r.hovermode||(t._hoverdata=[v(e,a)],i.click(t,n.event))}))}function b(e,t,r){var n=g.castOption(e.insidetextfont.color,t.pts);!n&&e._input.textfont&&(n=g.castOption(e._input.textfont.color,t.pts));var a=g.castOption(e.insidetextfont.family,t.pts)||g.castOption(e.textfont.family,t.pts)||r.family,i=g.castOption(e.insidetextfont.size,t.pts)||g.castOption(e.textfont.size,t.pts)||r.size,l=g.castOption(e.insidetextfont.weight,t.pts)||g.castOption(e.textfont.weight,t.pts)||r.weight,s=g.castOption(e.insidetextfont.style,t.pts)||g.castOption(e.textfont.style,t.pts)||r.style,u=g.castOption(e.insidetextfont.variant,t.pts)||g.castOption(e.textfont.variant,t.pts)||r.variant,c=g.castOption(e.insidetextfont.textcase,t.pts)||g.castOption(e.textfont.textcase,t.pts)||r.textcase,f=g.castOption(e.insidetextfont.lineposition,t.pts)||g.castOption(e.textfont.lineposition,t.pts)||r.lineposition,d=g.castOption(e.insidetextfont.shadow,t.pts)||g.castOption(e.textfont.shadow,t.pts)||r.shadow;return{color:n||o.contrast(t.color),family:a,size:i,weight:l,style:s,variant:u,textcase:c,lineposition:f,shadow:d}}function _(e,t){for(var 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0===(s=e.trace.aspectratio)?1:s),c=t.w*(i.domain.x[1]-i.domain.x[0])/2;return-1!==i.title.position.indexOf("left")?(c+=u,o.x-=(1+a)*u,l.tx+=e.titleBox.width/2):-1!==i.title.position.indexOf("center")?c*=2:-1!==i.title.position.indexOf("right")&&(c+=u,o.x+=(1+a)*u,l.tx-=e.titleBox.width/2),r=c/e.titleBox.width,n=O(e,t)/e.titleBox.height,{x:o.x,y:o.y,scale:Math.min(r,n),tx:l.tx,ty:l.ty}}function O(e,t){var r=e.trace,n=t.h*(r.domain.y[1]-r.domain.y[0]);return Math.min(e.titleBox.height,n/2)}function D(e){var t,r=e.pull;if(!r)return 0;if(s.isArrayOrTypedArray(r))for(r=0,t=0;tr&&(r=e.pull[t]);return r}function B(e,t){for(var r=[],n=0;n1?c=(u=r.r)/a.aspectratio:u=(c=r.r)*a.aspectratio,s=(u*=(1+a.baseratio)/2)*c}o=Math.min(o,s/r.vTotal)}for(n=0;n")}if(i){var x=s.castOption(a,t.i,"texttemplate");if(x){var 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t,r,n,a=e[0],i=a.r,o=a.trace,l=g.getRotationAngle(o.rotation),s=2*Math.PI/a.vTotal,u="px0",c="px1";if("counterclockwise"===o.direction){for(t=0;ta.vTotal/2?1:0,r.halfangle=Math.PI*Math.min(r.v/a.vTotal,.5),r.ring=1-o.hole,r.rInscribed=C(r,a))}(t),p.attr("stroke-linejoin","round"),p.each((function(){var y=n.select(this).selectAll("g.slice").data(t);y.enter().append("g").classed("slice",!0),y.exit().remove();var _=[[[],[]],[[],[]]],w=!1;y.each((function(a,o){if(a.hidden)n.select(this).selectAll("path,g").remove();else{a.pointNumber=a.i,a.curveNumber=v.index,_[a.pxmid[1]<0?0:1][a.pxmid[0]<0?0:1].push(a);var u=m.cx,c=m.cy,d=n.select(this),p=d.selectAll("path.surface").data([a]);if(p.enter().append("path").classed("surface",!0).style({"pointer-events":r?"none":"all"}),d.call(x,e,t),v.pull){var y=+g.castOption(v.pull,a.pts)||0;y>0&&(u+=y*a.pxmid[0],c+=y*a.pxmid[1])}a.cxFinal=u,a.cyFinal=c;var k=v.hole;if(a.v===m.vTotal){var T="M"+(u+a.px0[0])+","+(c+a.px0[1])+O(a.px0,a.pxmid,!0,1)+O(a.pxmid,a.px0,!0,1)+"Z";k?p.attr("d","M"+(u+k*a.px0[0])+","+(c+k*a.px0[1])+O(a.px0,a.pxmid,!1,k)+O(a.pxmid,a.px0,!1,k)+"Z"+T):p.attr("d",T)}else{var M=O(a.px0,a.px1,!0,1);if(k){var z=1-k;p.attr("d","M"+(u+k*a.px1[0])+","+(c+k*a.px1[1])+O(a.px1,a.px0,!1,k)+"l"+z*a.px0[0]+","+z*a.px0[1]+M+"Z")}else p.attr("d","M"+u+","+c+"l"+a.px0[0]+","+a.px0[1]+M+"Z")}I(e,a,m);var C=g.castOption(v.textposition,a.pts),L=d.selectAll("g.slicetext").data(a.text&&"none"!==C?[0]:[]);L.enter().append("g").classed("slicetext",!0),L.exit().remove(),L.each((function(){var 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e=a.year(),t=a.month(),e=e<=0?e+1:e,(r=a.day())+Math.ceil(29.5*(t-1))+354*(e-1)+Math.floor((3+11*e)/30)+this.jdEpoch-1},fromJD:function(e){e=Math.floor(e)+.5;var t=Math.floor((30*(e-this.jdEpoch)+10646)/10631);t=t<=0?t-1:t;var r=Math.min(12,Math.ceil((e-29-this.toJD(t,1,1))/29.5)+1),n=e-this.toJD(t,r,1)+1;return this.newDate(t,r,n)}}),n.calendars.islamic=i},4747:function(e,t,r){var n=r(8700),a=r(896);function i(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}i.prototype=new 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r=this._validate(e,t,this.minDay,n.local.invalidMonth);return this.daysPerMonth[r.month()-1]+(2===r.month()&&this.leapYear(r.year())?1:0)},weekDay:function(e,t,r){return(this.dayOfWeek(e,t,r)||7)<6},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);return e=a.year(),t=a.month(),r=a.day(),e<0&&e++,t<=2&&(e--,t+=12),Math.floor(365.25*(e+4716))+Math.floor(30.6001*(t+1))+r-1524.5},fromJD:function(e){var t=Math.floor(e+.5)+1524,r=Math.floor((t-122.1)/365.25),n=Math.floor(365.25*r),a=Math.floor((t-n)/30.6001),i=a-Math.floor(a<14?1:13),o=r-Math.floor(i>2?4716:4715),l=t-n-Math.floor(30.6001*a);return o<=0&&o--,this.newDate(o,i,l)}}),n.calendars.julian=i},5616:function(e,t,r){var n=r(8700),a=r(896);function i(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}function o(e,t){return e-t*Math.floor(e/t)}function l(e,t){return o(e-1,t)+1}i.prototype=new 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this._validate(e,this.minMonth,this.minDay,n.local.invalidYear),!1},formatYear:function(e){e=this._validate(e,this.minMonth,this.minDay,n.local.invalidYear).year();var t=Math.floor(e/400);return e%=400,e+=e<0?400:0,t+"."+Math.floor(e/20)+"."+e%20},forYear:function(e){if((e=e.split(".")).length<3)throw"Invalid Mayan year";for(var t=0,r=0;r19||r>0&&n<0)throw"Invalid Mayan year";t=20*t+n}return t},monthsInYear:function(e){return this._validate(e,this.minMonth,this.minDay,n.local.invalidYear),18},weekOfYear:function(e,t,r){return this._validate(e,t,r,n.local.invalidDate),0},daysInYear:function(e){return this._validate(e,this.minMonth,this.minDay,n.local.invalidYear),360},daysInMonth:function(e,t){return this._validate(e,t,this.minDay,n.local.invalidMonth),20},daysInWeek:function(){return 5},dayOfWeek:function(e,t,r){return this._validate(e,t,r,n.local.invalidDate).day()},weekDay:function(e,t,r){return this._validate(e,t,r,n.local.invalidDate),!0},extraInfo:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate).toJD(),i=this._toHaab(a),o=this._toTzolkin(a);return{haabMonthName:this.local.haabMonths[i[0]-1],haabMonth:i[0],haabDay:i[1],tzolkinDayName:this.local.tzolkinMonths[o[0]-1],tzolkinDay:o[0],tzolkinTrecena:o[1]}},_toHaab:function(e){var t=o(8+(e-=this.jdEpoch)+340,365);return[Math.floor(t/20)+1,o(t,20)]},_toTzolkin:function(e){return[l(20+(e-=this.jdEpoch),20),l(e+4,13)]},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);return a.day()+20*a.month()+360*a.year()+this.jdEpoch},fromJD:function(e){e=Math.floor(e)+.5-this.jdEpoch;var t=Math.floor(e/360);e%=360,e+=e<0?360:0;var r=Math.floor(e/20),n=e%20;return this.newDate(t,r,n)}}),n.calendars.mayan=i},632:function(e,t,r){var n=r(8700),a=r(896);function i(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}i.prototype=new n.baseCalendar;var 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n.add(-n.dayOfWeek(),"d"),Math.floor((n.dayOfYear()-1)/7)+1},daysInYear:function(e){if(e=this._validate(e,this.minMonth,this.minDay,n.local.invalidYear).year(),void 0===this.NEPALI_CALENDAR_DATA[e])return this.daysPerYear;for(var t=0,r=this.minMonth;r<=12;r++)t+=this.NEPALI_CALENDAR_DATA[e][r];return t},daysInMonth:function(e,t){return e.year&&(t=e.month(),e=e.year()),this._validate(e,t,this.minDay,n.local.invalidMonth),void 0===this.NEPALI_CALENDAR_DATA[e]?this.daysPerMonth[t-1]:this.NEPALI_CALENDAR_DATA[e][t]},weekDay:function(e,t,r){return 6!==this.dayOfWeek(e,t,r)},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);e=a.year(),t=a.month(),r=a.day();var i=n.instance(),o=0,l=t,s=e;this._createMissingCalendarData(e);var u=e-(l>9||9===l&&r>=this.NEPALI_CALENDAR_DATA[s][0]?56:57);for(9!==t&&(o=r,l--);9!==l;)l<=0&&(l=12,s--),o+=this.NEPALI_CALENDAR_DATA[s][l],l--;return 9===t?(o+=r-this.NEPALI_CALENDAR_DATA[s][0])<0&&(o+=i.daysInYear(u)):o+=this.NEPALI_CALENDAR_DATA[s][9]-this.NEPALI_CALENDAR_DATA[s][0],i.newDate(u,1,1).add(o,"d").toJD()},fromJD:function(e){var t=n.instance().fromJD(e),r=t.year(),a=t.dayOfYear(),i=r+56;this._createMissingCalendarData(i);for(var o=9,l=this.NEPALI_CALENDAR_DATA[i][0],s=this.NEPALI_CALENDAR_DATA[i][o]-l+1;a>s;)++o>12&&(o=1,i++),s+=this.NEPALI_CALENDAR_DATA[i][o];var u=this.NEPALI_CALENDAR_DATA[i][o]-(s-a);return this.newDate(i,o,u)},_createMissingCalendarData:function(e){var t=this.daysPerMonth.slice(0);t.unshift(17);for(var r=e-1;r0?474:473))%2820+474+38)%2816<682},weekOfYear:function(e,t,r){var n=this.newDate(e,t,r);return n.add(-(n.dayOfWeek()+1)%7,"d"),Math.floor((n.dayOfYear()-1)/7)+1},daysInMonth:function(e,t){var r=this._validate(e,t,this.minDay,n.local.invalidMonth);return this.daysPerMonth[r.month()-1]+(12===r.month()&&this.leapYear(r.year())?1:0)},weekDay:function(e,t,r){return 5!==this.dayOfWeek(e,t,r)},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);e=a.year(),t=a.month(),r=a.day();var i=e-(e>=0?474:473),l=474+o(i,2820);return r+(t<=7?31*(t-1):30*(t-1)+6)+Math.floor((682*l-110)/2816)+365*(l-1)+1029983*Math.floor(i/2820)+this.jdEpoch-1},fromJD:function(e){var t=(e=Math.floor(e)+.5)-this.toJD(475,1,1),r=Math.floor(t/1029983),n=o(t,1029983),a=2820;if(1029982!==n){var i=Math.floor(n/366),l=o(n,366);a=Math.floor((2134*i+2816*l+2815)/1028522)+i+1}var s=a+2820*r+474;s=s<=0?s-1:s;var u=e-this.toJD(s,1,1)+1,c=u<=186?Math.ceil(u/31):Math.ceil((u-6)/30),f=e-this.toJD(s,c,1)+1;return this.newDate(s,c,f)}}),n.calendars.persian=i,n.calendars.jalali=i},9075:function(e,t,r){var n=r(8700),a=r(896),i=n.instance();function o(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}o.prototype=new 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o[a]-o[a-1];a++}return 30},weekDay:function(e,t,r){return 5!==this.dayOfWeek(e,t,r)},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate),i=12*(a.year()-1)+a.month()-15292;return a.day()+o[i-1]-1+24e5-.5},fromJD:function(e){for(var t=e-24e5+.5,r=0,n=0;nt);n++)r++;var a=r+15292,i=Math.floor((a-1)/12),l=i+1,s=a-12*i,u=t-o[r-1]+1;return this.newDate(l,s,u)},isValid:function(e,t,r){var a=n.baseCalendar.prototype.isValid.apply(this,arguments);return a&&(a=(e=null!=e.year?e.year:e)>=1276&&e<=1500),a},_validate:function(e,t,r,a){var i=n.baseCalendar.prototype._validate.apply(this,arguments);if(i.year<1276||i.year>1500)throw a.replace(/\{0\}/,this.local.name);return i}}),n.calendars.ummalqura=i;var 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n=r(896);function a(){this.regionalOptions=[],this.regionalOptions[""]={invalidCalendar:"Calendar {0} not found",invalidDate:"Invalid {0} date",invalidMonth:"Invalid {0} month",invalidYear:"Invalid {0} year",differentCalendars:"Cannot mix {0} and {1} dates"},this.local=this.regionalOptions[""],this.calendars={},this._localCals={}}function i(e,t,r,n){if(this._calendar=e,this._year=t,this._month=r,this._day=n,0===this._calendar._validateLevel&&!this._calendar.isValid(this._year,this._month,this._day))throw(u.local.invalidDate||u.regionalOptions[""].invalidDate).replace(/\{0\}/,this._calendar.local.name)}function o(e,t){return"000000".substring(0,t-(e=""+e).length)+e}function l(){this.shortYearCutoff="+10"}function s(e){this.local=this.regionalOptions[e]||this.regionalOptions[""]}n(a.prototype,{instance:function(e,t){e=(e||"gregorian").toLowerCase(),t=t||"";var r=this._localCals[e+"-"+t];if(!r&&this.calendars[e]&&(r=new 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0===arguments.length?this._day:this.set(e,"d")},date:function(e,t,r){if(!this._calendar.isValid(e,t,r))throw(u.local.invalidDate||u.regionalOptions[""].invalidDate).replace(/\{0\}/,this._calendar.local.name);return this._year=e,this._month=t,this._day=r,this},leapYear:function(){return this._calendar.leapYear(this)},epoch:function(){return this._calendar.epoch(this)},formatYear:function(){return this._calendar.formatYear(this)},monthOfYear:function(){return this._calendar.monthOfYear(this)},weekOfYear:function(){return this._calendar.weekOfYear(this)},daysInYear:function(){return this._calendar.daysInYear(this)},dayOfYear:function(){return this._calendar.dayOfYear(this)},daysInMonth:function(){return this._calendar.daysInMonth(this)},dayOfWeek:function(){return this._calendar.dayOfWeek(this)},weekDay:function(){return this._calendar.weekDay(this)},extraInfo:function(){return this._calendar.extraInfo(this)},add:function(e,t){return this._calendar.add(this,e,t)},set:function(e,t){return this._calendar.set(this,e,t)},compareTo:function(e){if(this._calendar.name!==e._calendar.name)throw(u.local.differentCalendars||u.regionalOptions[""].differentCalendars).replace(/\{0\}/,this._calendar.local.name).replace(/\{1\}/,e._calendar.local.name);var t=this._year!==e._year?this._year-e._year:this._month!==e._month?this.monthOfYear()-e.monthOfYear():this._day-e._day;return 0===t?0:t<0?-1:1},calendar:function(){return this._calendar},toJD:function(){return this._calendar.toJD(this)},fromJD:function(e){return this._calendar.fromJD(e)},toJSDate:function(){return this._calendar.toJSDate(this)},fromJSDate:function(e){return this._calendar.fromJSDate(e)},toString:function(){return(this.year()<0?"-":"")+o(Math.abs(this.year()),4)+"-"+o(this.month(),2)+"-"+o(this.day(),2)}}),n(l.prototype,{_validateLevel:0,newDate:function(e,t,r){return null==e?this.today():(e.year&&(this._validate(e,t,r,u.local.invalidDate||u.regionalOptions[""].invalidDate),r=e.day(),t=e.month(),e=e.year()),new i(this,e,t,r))},today:function(){return this.fromJSDate(new Date)},epoch:function(e){return this._validate(e,this.minMonth,this.minDay,u.local.invalidYear||u.regionalOptions[""].invalidYear).year()<0?this.local.epochs[0]:this.local.epochs[1]},formatYear:function(e){var t=this._validate(e,this.minMonth,this.minDay,u.local.invalidYear||u.regionalOptions[""].invalidYear);return(t.year()<0?"-":"")+o(Math.abs(t.year()),4)},monthsInYear:function(e){return this._validate(e,this.minMonth,this.minDay,u.local.invalidYear||u.regionalOptions[""].invalidYear),12},monthOfYear:function(e,t){var r=this._validate(e,t,this.minDay,u.local.invalidMonth||u.regionalOptions[""].invalidMonth);return(r.month()+this.monthsInYear(r)-this.firstMonth)%this.monthsInYear(r)+this.minMonth},fromMonthOfYear:function(e,t){var r=(t+this.firstMonth-2*this.minMonth)%this.monthsInYear(e)+this.minMonth;return 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t=this.popToken(),r=t.text,n=t.noexpand?null:this._getExpansion(r);if(null==n||e&&n.unexpandable){if(e&&null==n&&"\\"===r[0]&&!this.isDefined(r))throw new H("Undefined control sequence: "+r);return this.pushToken(t),!1}this.countExpansion(1);var a=n.tokens,i=this.consumeArgs(n.numArgs,n.delimiters);if(n.numArgs)for(var o=(a=a.slice()).length-1;o>=0;--o){var l=a[o];if("#"===l.text){if(0===o)throw new H("Incomplete placeholder at end of macro body",l);if("#"===(l=a[--o]).text)a.splice(o+1,1);else{if(!/^[1-9]$/.test(l.text))throw new H("Not a valid argument number",l);a.splice(o,2,...i[+l.text-1])}}}return this.pushTokens(a),a.length}expandAfterFuture(){return this.expandOnce(),this.future()}expandNextToken(){for(;;)if(!1===this.expandOnce()){var e=this.stack.pop();return e.treatAsRelax&&(e.text="\\relax"),e}throw new Error}expandMacro(e){return this.macros.has(e)?this.expandTokens([new F(e)]):void 0}expandTokens(e){var t=[],r=this.stack.length;for(this.pushTokens(e);this.stack.length>r;)if(!1===this.expandOnce(!0)){var n=this.stack.pop();n.treatAsRelax&&(n.noexpand=!1,n.treatAsRelax=!1),t.push(n)}return this.countExpansion(t.length),t}expandMacroAsText(e){var t=this.expandMacro(e);return t?t.map((e=>e.text)).join(""):t}_getExpansion(e){var t=this.macros.get(e);if(null==t)return t;if(1===e.length){var r=this.lexer.catcodes[e];if(null!=r&&13!==r)return}var n="function"==typeof t?t(this):t;if("string"==typeof n){var a=0;if(-1!==n.indexOf("#"))for(var i=n.replace(/##/g,"");-1!==i.indexOf("#"+(a+1));)++a;for(var o=new oa(n,this.settings),l=[],s=o.lex();"EOF"!==s.text;)l.push(s),s=o.lex();return l.reverse(),{tokens:l,numArgs:a}}return n}isDefined(e){return this.macros.has(e)||ea.hasOwnProperty(e)||He.math.hasOwnProperty(e)||He.text.hasOwnProperty(e)||ma.hasOwnProperty(e)}isExpandable(e){var t=this.macros.get(e);return null!=t?"string"==typeof t||"function"==typeof t||!t.unexpandable:ea.hasOwnProperty(e)&&!ea[e].primitive}}var va=/^[₊₋₌₍₎₀₁₂₃₄₅₆₇₈₉ₐₑₕᵢⱼₖₗₘₙₒₚᵣₛₜᵤᵥₓᵦᵧᵨᵩᵪ]/,ya=Object.freeze({"₊":"+","₋":"-","₌":"=","₍":"(","₎":")","₀":"0","₁":"1","₂":"2","₃":"3","₄":"4","₅":"5","₆":"6","₇":"7","₈":"8","₉":"9",ₐ:"a",ₑ:"e",ₕ:"h",ᵢ:"i",ⱼ:"j",ₖ:"k",ₗ:"l",ₘ:"m",ₙ:"n",ₒ:"o",ₚ:"p",ᵣ:"r",ₛ:"s",ₜ:"t",ᵤ:"u",ᵥ:"v",ₓ:"x",ᵦ:"β",ᵧ:"γ",ᵨ:"ρ",ᵩ:"ϕ",ᵪ:"χ","⁺":"+","⁻":"-","⁼":"=","⁽":"(","⁾":")","⁰":"0","¹":"1","²":"2","³":"3","⁴":"4","⁵":"5","⁶":"6","⁷":"7","⁸":"8","⁹":"9",ᴬ:"A",ᴮ:"B",ᴰ:"D",ᴱ:"E",ᴳ:"G",ᴴ:"H",ᴵ:"I",ᴶ:"J",ᴷ:"K",ᴸ:"L",ᴹ:"M",ᴺ:"N",ᴼ:"O",ᴾ:"P",ᴿ:"R",ᵀ:"T",ᵁ:"U",ⱽ:"V",ᵂ:"W",ᵃ:"a",ᵇ:"b",ᶜ:"c",ᵈ:"d",ᵉ:"e",ᶠ:"f",ᵍ:"g",ʰ:"h",ⁱ:"i",ʲ:"j",ᵏ:"k",ˡ:"l",ᵐ:"m",ⁿ:"n",ᵒ:"o",ᵖ:"p",ʳ:"r",ˢ:"s",ᵗ:"t",ᵘ:"u",ᵛ:"v",ʷ:"w",ˣ:"x",ʸ:"y",ᶻ:"z",ᵝ:"β",ᵞ:"γ",ᵟ:"δ",ᵠ:"ϕ",ᵡ:"χ",ᶿ:"θ"}),xa={"́":{text:"\\'",math:"\\acute"},"̀":{text:"\\`",math:"\\grave"},"̈":{text:'\\"',math:"\\ddot"},"̃":{text:"\\~",math:"\\tilde"},"̄":{text:"\\=",math:"\\bar"},"̆":{text:"\\u",math:"\\breve"},"̌":{text:"\\v",math:"\\check"},"̂":{text:"\\^",math:"\\hat"},"̇":{text:"\\.",math:"\\dot"},"̊":{text:"\\r",math:"\\mathring"},"̋":{text:"\\H"},"̧":{text:"\\c"}},ba={á:"á",à:"à",ä:"ä",ǟ:"ǟ",ã:"ã",ā:"ā",ă:"ă",ắ:"ắ",ằ:"ằ",ẵ:"ẵ",ǎ:"ǎ",â:"â",ấ:"ấ",ầ:"ầ",ẫ:"ẫ",ȧ:"ȧ",ǡ:"ǡ",å:"å",ǻ:"ǻ",ḃ:"ḃ",ć:"ć",ḉ:"ḉ",č:"č",ĉ:"ĉ",ċ:"ċ",ç:"ç",ď:"ď",ḋ:"ḋ",ḑ:"ḑ",é:"é",è:"è",ë:"ë",ẽ:"ẽ",ē:"ē",ḗ:"ḗ",ḕ:"ḕ",ĕ:"ĕ",ḝ:"ḝ",ě:"ě",ê:"ê",ế:"ế",ề:"ề",ễ:"ễ",ė:"ė",ȩ:"ȩ",ḟ:"ḟ",ǵ:"ǵ",ḡ:"ḡ",ğ:"ğ",ǧ:"ǧ",ĝ:"ĝ",ġ:"ġ",ģ:"ģ",ḧ:"ḧ",ȟ:"ȟ",ĥ:"ĥ",ḣ:"ḣ",ḩ:"ḩ",í:"í",ì:"ì",ï:"ï",ḯ:"ḯ",ĩ:"ĩ",ī:"ī",ĭ:"ĭ",ǐ:"ǐ",î:"î",ǰ:"ǰ",ĵ:"ĵ",ḱ:"ḱ",ǩ:"ǩ",ķ:"ķ",ĺ:"ĺ",ľ:"ľ",ļ:"ļ",ḿ:"ḿ",ṁ:"ṁ",ń:"ń",ǹ:"ǹ",ñ:"ñ",ň:"ň",ṅ:"ṅ",ņ:"ņ",ó:"ó",ò:"ò",ö:"ö",ȫ:"ȫ",õ:"õ",ṍ:"ṍ",ṏ:"ṏ",ȭ:"ȭ",ō:"ō",ṓ:"ṓ",ṑ:"ṑ",ŏ:"ŏ",ǒ:"ǒ",ô:"ô",ố:"ố",ồ:"ồ",ỗ:"ỗ",ȯ:"ȯ",ȱ:"ȱ",ő:"ő",ṕ:"ṕ",ṗ:"ṗ",ŕ:"ŕ",ř:"ř",ṙ:"ṙ",ŗ:"ŗ",ś:"ś",ṥ:"ṥ",š:"š",ṧ:"ṧ",ŝ:"ŝ",ṡ:"ṡ",ş:"ş",ẗ:"ẗ",ť:"ť",ṫ:"ṫ",ţ:"ţ",ú:"ú",ù:"ù",ü:"ü",ǘ:"ǘ",ǜ:"ǜ",ǖ:"ǖ",ǚ:"ǚ",ũ:"ũ",ṹ:"ṹ",ū:"ū",ṻ:"ṻ",ŭ:"ŭ",ǔ:"ǔ",û:"û",ů:"ů",ű:"ű",ṽ:"ṽ",ẃ:"ẃ",ẁ:"ẁ",ẅ:"ẅ",ŵ:"ŵ",ẇ:"ẇ",ẘ:"ẘ",ẍ:"ẍ",ẋ:"ẋ",ý:"ý",ỳ:"ỳ",ÿ:"ÿ",ỹ:"ỹ",ȳ:"ȳ",ŷ:"ŷ",ẏ:"ẏ",ẙ:"ẙ",ź:"ź",ž:"ž",ẑ:"ẑ",ż:"ż",Á:"Á",À:"À",Ä:"Ä",Ǟ:"Ǟ",Ã:"Ã",Ā:"Ā",Ă:"Ă",Ắ:"Ắ",Ằ:"Ằ",Ẵ:"Ẵ",Ǎ:"Ǎ",Â:"Â",Ấ:"Ấ",Ầ:"Ầ",Ẫ:"Ẫ",Ȧ:"Ȧ",Ǡ:"Ǡ",Å:"Å",Ǻ:"Ǻ",Ḃ:"Ḃ",Ć:"Ć",Ḉ:"Ḉ",Č:"Č",Ĉ:"Ĉ",Ċ:"Ċ",Ç:"Ç",Ď:"Ď",Ḋ:"Ḋ",Ḑ:"Ḑ",É:"É",È:"È",Ë:"Ë",Ẽ:"Ẽ",Ē:"Ē",Ḗ:"Ḗ",Ḕ:"Ḕ",Ĕ:"Ĕ",Ḝ:"Ḝ",Ě:"Ě",Ê:"Ê",Ế:"Ế",Ề:"Ề",Ễ:"Ễ",Ė:"Ė",Ȩ:"Ȩ",Ḟ:"Ḟ",Ǵ:"Ǵ",Ḡ:"Ḡ",Ğ:"Ğ",Ǧ:"Ǧ",Ĝ:"Ĝ",Ġ:"Ġ",Ģ:"Ģ",Ḧ:"Ḧ",Ȟ:"Ȟ",Ĥ:"Ĥ",Ḣ:"Ḣ",Ḩ:"Ḩ",Í:"Í",Ì:"Ì",Ï:"Ï",Ḯ:"Ḯ",Ĩ:"Ĩ",Ī:"Ī",Ĭ:"Ĭ",Ǐ:"Ǐ",Î:"Î",İ:"İ",Ĵ:"Ĵ",Ḱ:"Ḱ",Ǩ:"Ǩ",Ķ:"Ķ",Ĺ:"Ĺ",Ľ:"Ľ",Ļ:"Ļ",Ḿ:"Ḿ",Ṁ:"Ṁ",Ń:"Ń",Ǹ:"Ǹ",Ñ:"Ñ",Ň:"Ň",Ṅ:"Ṅ",Ņ:"Ņ",Ó:"Ó",Ò:"Ò",Ö:"Ö",Ȫ:"Ȫ",Õ:"Õ",Ṍ:"Ṍ",Ṏ:"Ṏ",Ȭ:"Ȭ",Ō:"Ō",Ṓ:"Ṓ",Ṑ:"Ṑ",Ŏ:"Ŏ",Ǒ:"Ǒ",Ô:"Ô",Ố:"Ố",Ồ:"Ồ",Ỗ:"Ỗ",Ȯ:"Ȯ",Ȱ:"Ȱ",Ő:"Ő",Ṕ:"Ṕ",Ṗ:"Ṗ",Ŕ:"Ŕ",Ř:"Ř",Ṙ:"Ṙ",Ŗ:"Ŗ",Ś:"Ś",Ṥ:"Ṥ",Š:"Š",Ṧ:"Ṧ",Ŝ:"Ŝ",Ṡ:"Ṡ",Ş:"Ş",Ť:"Ť",Ṫ:"Ṫ",Ţ:"Ţ",Ú:"Ú",Ù:"Ù",Ü:"Ü",Ǘ:"Ǘ",Ǜ:"Ǜ",Ǖ:"Ǖ",Ǚ:"Ǚ",Ũ:"Ũ",Ṹ:"Ṹ",Ū:"Ū",Ṻ:"Ṻ",Ŭ:"Ŭ",Ǔ:"Ǔ",Û:"Û",Ů:"Ů",Ű:"Ű",Ṽ:"Ṽ",Ẃ:"Ẃ",Ẁ:"Ẁ",Ẅ:"Ẅ",Ŵ:"Ŵ",Ẇ:"Ẇ",Ẍ:"Ẍ",Ẋ:"Ẋ",Ý:"Ý",Ỳ:"Ỳ",Ÿ:"Ÿ",Ỹ:"Ỹ",Ȳ:"Ȳ",Ŷ:"Ŷ",Ẏ:"Ẏ",Ź:"Ź",Ž:"Ž",Ẑ:"Ẑ",Ż:"Ż",ά:"ά",ὰ:"ὰ",ᾱ:"ᾱ",ᾰ:"ᾰ",έ:"έ",ὲ:"ὲ",ή:"ή",ὴ:"ὴ",ί:"ί",ὶ:"ὶ",ϊ:"ϊ",ΐ:"ΐ",ῒ:"ῒ",ῑ:"ῑ",ῐ:"ῐ",ό:"ό",ὸ:"ὸ",ύ:"ύ",ὺ:"ὺ",ϋ:"ϋ",ΰ:"ΰ",ῢ:"ῢ",ῡ:"ῡ",ῠ:"ῠ",ώ:"ώ",ὼ:"ὼ",Ύ:"Ύ",Ὺ:"Ὺ",Ϋ:"Ϋ",Ῡ:"Ῡ",Ῠ:"Ῠ",Ώ:"Ώ",Ὼ:"Ὼ"};class _a{constructor(e,t){this.mode=void 0,this.gullet=void 0,this.settings=void 0,this.leftrightDepth=void 0,this.nextToken=void 0,this.mode="math",this.gullet=new ga(e,t,this.mode),this.settings=t,this.leftrightDepth=0}expect(e,t){if(void 0===t&&(t=!0),this.fetch().text!==e)throw new H("Expected '"+e+"', got '"+this.fetch().text+"'",this.fetch());t&&this.consume()}consume(){this.nextToken=null}fetch(){return null==this.nextToken&&(this.nextToken=this.gullet.expandNextToken()),this.nextToken}switchMode(e){this.mode=e,this.gullet.switchMode(e)}parse(){this.settings.globalGroup||this.gullet.beginGroup(),this.settings.colorIsTextColor&&this.gullet.macros.set("\\color","\\textcolor");try{var e=this.parseExpression(!1);return this.expect("EOF"),this.settings.globalGroup||this.gullet.endGroup(),e}finally{this.gullet.endGroups()}}subparse(e){var t=this.nextToken;this.consume(),this.gullet.pushToken(new F("}")),this.gullet.pushTokens(e);var r=this.parseExpression(!1);return this.expect("}"),this.nextToken=t,r}parseExpression(e,t){for(var r=[];;){"math"===this.mode&&this.consumeSpaces();var n=this.fetch();if(-1!==_a.endOfExpression.indexOf(n.text))break;if(t&&n.text===t)break;if(e&&ea[n.text]&&ea[n.text].infix)break;var a=this.parseAtom(t);if(!a)break;"internal"!==a.type&&r.push(a)}return"text"===this.mode&&this.formLigatures(r),this.handleInfixNodes(r)}handleInfixNodes(e){for(var t,r=-1,n=0;n=0&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+t[0]+'" used in math mode',e);var o,l=He[this.mode][t].group,s=N.range(e);if(Ne.hasOwnProperty(l)){var u=l;o={type:"atom",mode:this.mode,family:u,loc:s,text:t}}else o={type:l,mode:this.mode,loc:s,text:t};a=o}else{if(!(t.charCodeAt(0)>=128))return null;this.settings.strict&&(se(t.charCodeAt(0))?"math"===this.mode&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+t[0]+'" used in math mode',e):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode character "'+t[0]+'" ('+t.charCodeAt(0)+")",e)),a={type:"textord",mode:"text",loc:N.range(e),text:t}}if(this.consume(),i)for(var c=0;c{var e={543:function(e,t,r){var n;e=r.nmd(e),function(){var a,i="Expected a function",o="__lodash_hash_undefined__",l="__lodash_placeholder__",s=32,u=128,c=1/0,f=9007199254740991,d=NaN,h=4294967295,p=[["ary",u],["bind",1],["bindKey",2],["curry",8],["curryRight",16],["flip",512],["partial",s],["partialRight",64],["rearg",256]],v="[object Arguments]",g="[object Array]",y="[object Boolean]",m="[object Date]",x="[object Error]",_="[object Function]",b="[object GeneratorFunction]",w="[object Map]",T="[object Number]",M="[object Object]",k="[object Promise]",A="[object RegExp]",L="[object Set]",S="[object String]",O="[object Symbol]",C="[object WeakMap]",D="[object ArrayBuffer]",P="[object DataView]",I="[object Float32Array]",E="[object Float64Array]",R="[object Int8Array]",z="[object 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n=r(6196),a=r(2300);e.exports={moduleType:"component",name:"annotations",layoutAttributes:r(3916),supplyLayoutDefaults:r(5216),includeBasePlot:r(6632)("annotations"),calcAutorange:r(272),draw:n.draw,drawOne:n.drawOne,drawRaw:n.drawRaw,hasClickToShow:a.hasClickToShow,onClick:a.onClick,convertCoords:r(9208)}},5899:function(e,t,r){"use strict";var n=r(3916),a=r(7824).overrideAll,i=r(1780).templatedArray;e.exports=a(i("annotation",{visible:n.visible,x:{valType:"any"},y:{valType:"any"},z:{valType:"any"},ax:{valType:"number"},ay:{valType:"number"},xanchor:n.xanchor,xshift:n.xshift,yanchor:n.yanchor,yshift:n.yshift,text:n.text,textangle:n.textangle,font:n.font,width:n.width,height:n.height,opacity:n.opacity,align:n.align,valign:n.valign,bgcolor:n.bgcolor,bordercolor:n.bordercolor,borderpad:n.borderpad,borderwidth:n.borderwidth,showarrow:n.showarrow,arrowcolor:n.arrowcolor,arrowhead:n.arrowhead,startarrowhead:n.startarrowhead,arrowside:n.arrowside,arrowsize:n.arrowsize,startarrowsize:n.startarrowsize,arrowwidth:n.arrowwidth,standoff:n.standoff,startstandoff:n.startstandoff,hovertext:n.hovertext,hoverlabel:n.hoverlabel,captureevents:n.captureevents}),"calc","from-root")},76:function(e,t,r){"use strict";var n=r(3400),a=r(4460);function i(e,t){var 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r=n.subplotsRegistry.gl3d;if(r)for(var i=r.attrRegex,o=Object.keys(e),l=0;l=0))return e;if(3===o)n[o]>1&&(n[o]=1);else if(n[o]>=1)return e}var l=Math.round(255*n[0])+", "+Math.round(255*n[1])+", "+Math.round(255*n[2]);return i?"rgba("+l+", "+n[3]+")":"rgb("+l+")"}o.tinyRGB=function(e){var t=e.toRgb();return"rgb("+Math.round(t.r)+", "+Math.round(t.g)+", "+Math.round(t.b)+")"},o.rgb=function(e){return o.tinyRGB(n(e))},o.opacity=function(e){return e?n(e).getAlpha():0},o.addOpacity=function(e,t){var r=n(e).toRgb();return"rgba("+Math.round(r.r)+", "+Math.round(r.g)+", "+Math.round(r.b)+", "+t+")"},o.combine=function(e,t){var r=n(e).toRgb();if(1===r.a)return n(e).toRgbString();var a=n(t||u).toRgb(),i=1===a.a?a:{r:255*(1-a.a)+a.r*a.a,g:255*(1-a.a)+a.g*a.a,b:255*(1-a.a)+a.b*a.a},o={r:i.r*(1-r.a)+r.r*r.a,g:i.g*(1-r.a)+r.g*r.a,b:i.b*(1-r.a)+r.b*r.a};return n(o).toRgbString()},o.interpolate=function(e,t,r){var 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r=this._validate(e,t,this.minDay,n.local.invalidMonth);return this.daysPerMonth[r.month()-1]+(2===r.month()&&this.leapYear(r.year())?1:0)},weekDay:function(e,t,r){return(this.dayOfWeek(e,t,r)||7)<6},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);return e=a.year(),t=a.month(),r=a.day(),e<0&&e++,t<=2&&(e--,t+=12),Math.floor(365.25*(e+4716))+Math.floor(30.6001*(t+1))+r-1524.5},fromJD:function(e){var t=Math.floor(e+.5)+1524,r=Math.floor((t-122.1)/365.25),n=Math.floor(365.25*r),a=Math.floor((t-n)/30.6001),i=a-Math.floor(a<14?1:13),o=r-Math.floor(i>2?4716:4715),l=t-n-Math.floor(30.6001*a);return o<=0&&o--,this.newDate(o,i,l)}}),n.calendars.julian=i},5616:function(e,t,r){var n=r(8700),a=r(896);function i(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}function o(e,t){return e-t*Math.floor(e/t)}function l(e,t){return o(e-1,t)+1}i.prototype=new 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this._validate(e,this.minMonth,this.minDay,n.local.invalidYear),!1},formatYear:function(e){e=this._validate(e,this.minMonth,this.minDay,n.local.invalidYear).year();var t=Math.floor(e/400);return e%=400,e+=e<0?400:0,t+"."+Math.floor(e/20)+"."+e%20},forYear:function(e){if((e=e.split(".")).length<3)throw"Invalid Mayan year";for(var t=0,r=0;r19||r>0&&n<0)throw"Invalid Mayan year";t=20*t+n}return t},monthsInYear:function(e){return this._validate(e,this.minMonth,this.minDay,n.local.invalidYear),18},weekOfYear:function(e,t,r){return this._validate(e,t,r,n.local.invalidDate),0},daysInYear:function(e){return this._validate(e,this.minMonth,this.minDay,n.local.invalidYear),360},daysInMonth:function(e,t){return this._validate(e,t,this.minDay,n.local.invalidMonth),20},daysInWeek:function(){return 5},dayOfWeek:function(e,t,r){return this._validate(e,t,r,n.local.invalidDate).day()},weekDay:function(e,t,r){return this._validate(e,t,r,n.local.invalidDate),!0},extraInfo:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate).toJD(),i=this._toHaab(a),o=this._toTzolkin(a);return{haabMonthName:this.local.haabMonths[i[0]-1],haabMonth:i[0],haabDay:i[1],tzolkinDayName:this.local.tzolkinMonths[o[0]-1],tzolkinDay:o[0],tzolkinTrecena:o[1]}},_toHaab:function(e){var t=o(8+(e-=this.jdEpoch)+340,365);return[Math.floor(t/20)+1,o(t,20)]},_toTzolkin:function(e){return[l(20+(e-=this.jdEpoch),20),l(e+4,13)]},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);return a.day()+20*a.month()+360*a.year()+this.jdEpoch},fromJD:function(e){e=Math.floor(e)+.5-this.jdEpoch;var t=Math.floor(e/360);e%=360,e+=e<0?360:0;var r=Math.floor(e/20),n=e%20;return this.newDate(t,r,n)}}),n.calendars.mayan=i},632:function(e,t,r){var n=r(8700),a=r(896);function i(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}i.prototype=new n.baseCalendar;var 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n.add(1-(n.dayOfWeek()||7),"d"),Math.floor((n.dayOfYear()-1)/7)+1},daysInMonth:function(e,t){var r=this._validate(e,t,this.minDay,n.local.invalidMonth);return this.daysPerMonth[r.month()-1]+(12===r.month()&&this.leapYear(r.year())?1:0)},weekDay:function(e,t,r){return(this.dayOfWeek(e,t,r)||7)<6},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidMonth);(e=a.year())<0&&e++;for(var i=a.day(),l=1;l=this.toJD(t+1,1,1);)t++;for(var r=e-Math.floor(this.toJD(t,1,1)+.5)+1,n=1;r>this.daysInMonth(t,n);)r-=this.daysInMonth(t,n),n++;return this.newDate(t,n,r)}}),n.calendars.nanakshahi=i},3040:function(e,t,r){var n=r(8700),a=r(896);function i(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}i.prototype=new 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n.add(-n.dayOfWeek(),"d"),Math.floor((n.dayOfYear()-1)/7)+1},daysInYear:function(e){if(e=this._validate(e,this.minMonth,this.minDay,n.local.invalidYear).year(),void 0===this.NEPALI_CALENDAR_DATA[e])return this.daysPerYear;for(var t=0,r=this.minMonth;r<=12;r++)t+=this.NEPALI_CALENDAR_DATA[e][r];return t},daysInMonth:function(e,t){return e.year&&(t=e.month(),e=e.year()),this._validate(e,t,this.minDay,n.local.invalidMonth),void 0===this.NEPALI_CALENDAR_DATA[e]?this.daysPerMonth[t-1]:this.NEPALI_CALENDAR_DATA[e][t]},weekDay:function(e,t,r){return 6!==this.dayOfWeek(e,t,r)},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);e=a.year(),t=a.month(),r=a.day();var i=n.instance(),o=0,l=t,s=e;this._createMissingCalendarData(e);var u=e-(l>9||9===l&&r>=this.NEPALI_CALENDAR_DATA[s][0]?56:57);for(9!==t&&(o=r,l--);9!==l;)l<=0&&(l=12,s--),o+=this.NEPALI_CALENDAR_DATA[s][l],l--;return 9===t?(o+=r-this.NEPALI_CALENDAR_DATA[s][0])<0&&(o+=i.daysInYear(u)):o+=this.NEPALI_CALENDAR_DATA[s][9]-this.NEPALI_CALENDAR_DATA[s][0],i.newDate(u,1,1).add(o,"d").toJD()},fromJD:function(e){var t=n.instance().fromJD(e),r=t.year(),a=t.dayOfYear(),i=r+56;this._createMissingCalendarData(i);for(var o=9,l=this.NEPALI_CALENDAR_DATA[i][0],s=this.NEPALI_CALENDAR_DATA[i][o]-l+1;a>s;)++o>12&&(o=1,i++),s+=this.NEPALI_CALENDAR_DATA[i][o];var u=this.NEPALI_CALENDAR_DATA[i][o]-(s-a);return this.newDate(i,o,u)},_createMissingCalendarData:function(e){var t=this.daysPerMonth.slice(0);t.unshift(17);for(var r=e-1;r0?474:473))%2820+474+38)%2816<682},weekOfYear:function(e,t,r){var n=this.newDate(e,t,r);return n.add(-(n.dayOfWeek()+1)%7,"d"),Math.floor((n.dayOfYear()-1)/7)+1},daysInMonth:function(e,t){var r=this._validate(e,t,this.minDay,n.local.invalidMonth);return this.daysPerMonth[r.month()-1]+(12===r.month()&&this.leapYear(r.year())?1:0)},weekDay:function(e,t,r){return 5!==this.dayOfWeek(e,t,r)},toJD:function(e,t,r){var a=this._validate(e,t,r,n.local.invalidDate);e=a.year(),t=a.month(),r=a.day();var i=e-(e>=0?474:473),l=474+o(i,2820);return r+(t<=7?31*(t-1):30*(t-1)+6)+Math.floor((682*l-110)/2816)+365*(l-1)+1029983*Math.floor(i/2820)+this.jdEpoch-1},fromJD:function(e){var t=(e=Math.floor(e)+.5)-this.toJD(475,1,1),r=Math.floor(t/1029983),n=o(t,1029983),a=2820;if(1029982!==n){var i=Math.floor(n/366),l=o(n,366);a=Math.floor((2134*i+2816*l+2815)/1028522)+i+1}var s=a+2820*r+474;s=s<=0?s-1:s;var u=e-this.toJD(s,1,1)+1,c=u<=186?Math.ceil(u/31):Math.ceil((u-6)/30),f=e-this.toJD(s,c,1)+1;return this.newDate(s,c,f)}}),n.calendars.persian=i,n.calendars.jalali=i},9075:function(e,t,r){var n=r(8700),a=r(896),i=n.instance();function o(e){this.local=this.regionalOptions[e||""]||this.regionalOptions[""]}o.prototype=new 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n=r(896);function a(){this.regionalOptions=[],this.regionalOptions[""]={invalidCalendar:"Calendar {0} not found",invalidDate:"Invalid {0} date",invalidMonth:"Invalid {0} month",invalidYear:"Invalid {0} year",differentCalendars:"Cannot mix {0} and {1} dates"},this.local=this.regionalOptions[""],this.calendars={},this._localCals={}}function i(e,t,r,n){if(this._calendar=e,this._year=t,this._month=r,this._day=n,0===this._calendar._validateLevel&&!this._calendar.isValid(this._year,this._month,this._day))throw(u.local.invalidDate||u.regionalOptions[""].invalidDate).replace(/\{0\}/,this._calendar.local.name)}function o(e,t){return"000000".substring(0,t-(e=""+e).length)+e}function l(){this.shortYearCutoff="+10"}function s(e){this.local=this.regionalOptions[e]||this.regionalOptions[""]}n(a.prototype,{instance:function(e,t){e=(e||"gregorian").toLowerCase(),t=t||"";var r=this._localCals[e+"-"+t];if(!r&&this.calendars[e]&&(r=new 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0===arguments.length?this._day:this.set(e,"d")},date:function(e,t,r){if(!this._calendar.isValid(e,t,r))throw(u.local.invalidDate||u.regionalOptions[""].invalidDate).replace(/\{0\}/,this._calendar.local.name);return this._year=e,this._month=t,this._day=r,this},leapYear:function(){return this._calendar.leapYear(this)},epoch:function(){return this._calendar.epoch(this)},formatYear:function(){return this._calendar.formatYear(this)},monthOfYear:function(){return this._calendar.monthOfYear(this)},weekOfYear:function(){return this._calendar.weekOfYear(this)},daysInYear:function(){return this._calendar.daysInYear(this)},dayOfYear:function(){return this._calendar.dayOfYear(this)},daysInMonth:function(){return this._calendar.daysInMonth(this)},dayOfWeek:function(){return this._calendar.dayOfWeek(this)},weekDay:function(){return this._calendar.weekDay(this)},extraInfo:function(){return this._calendar.extraInfo(this)},add:function(e,t){return this._calendar.add(this,e,t)},set:function(e,t){return this._calendar.set(this,e,t)},compareTo:function(e){if(this._calendar.name!==e._calendar.name)throw(u.local.differentCalendars||u.regionalOptions[""].differentCalendars).replace(/\{0\}/,this._calendar.local.name).replace(/\{1\}/,e._calendar.local.name);var t=this._year!==e._year?this._year-e._year:this._month!==e._month?this.monthOfYear()-e.monthOfYear():this._day-e._day;return 0===t?0:t<0?-1:1},calendar:function(){return this._calendar},toJD:function(){return this._calendar.toJD(this)},fromJD:function(e){return this._calendar.fromJD(e)},toJSDate:function(){return this._calendar.toJSDate(this)},fromJSDate:function(e){return this._calendar.fromJSDate(e)},toString:function(){return(this.year()<0?"-":"")+o(Math.abs(this.year()),4)+"-"+o(this.month(),2)+"-"+o(this.day(),2)}}),n(l.prototype,{_validateLevel:0,newDate:function(e,t,r){return null==e?this.today():(e.year&&(this._validate(e,t,r,u.local.invalidDate||u.regionalOptions[""].invalidDate),r=e.day(),t=e.month(),e=e.year()),new i(this,e,t,r))},today:function(){return this.fromJSDate(new Date)},epoch:function(e){return this._validate(e,this.minMonth,this.minDay,u.local.invalidYear||u.regionalOptions[""].invalidYear).year()<0?this.local.epochs[0]:this.local.epochs[1]},formatYear:function(e){var t=this._validate(e,this.minMonth,this.minDay,u.local.invalidYear||u.regionalOptions[""].invalidYear);return(t.year()<0?"-":"")+o(Math.abs(t.year()),4)},monthsInYear:function(e){return this._validate(e,this.minMonth,this.minDay,u.local.invalidYear||u.regionalOptions[""].invalidYear),12},monthOfYear:function(e,t){var r=this._validate(e,t,this.minDay,u.local.invalidMonth||u.regionalOptions[""].invalidMonth);return(r.month()+this.monthsInYear(r)-this.firstMonth)%this.monthsInYear(r)+this.minMonth},fromMonthOfYear:function(e,t){var r=(t+this.firstMonth-2*this.minMonth)%this.monthsInYear(e)+this.minMonth;return 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svg{fill:currentColor;stroke:currentColor;fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .stretchy:after,.katex .stretchy:before{content:\\\"\\\"}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{border:.04em solid;box-sizing:border-box}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .eqn-num:before{content:\\\"(\\\" counter(katexEqnNo) \\\")\\\";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:\\\"(\\\" counter(mmlEqnNo) \\\")\\\";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","\"use strict\";\n\n/*\n MIT License http://www.opensource.org/licenses/mit-license.php\n Author Tobias Koppers @sokra\n*/\nmodule.exports = function (cssWithMappingToString) {\n var list = [];\n\n // return the list of modules as css string\n list.toString = function toString() {\n return this.map(function (item) {\n var content = \"\";\n var needLayer = typeof item[5] !== \"undefined\";\n if (item[4]) {\n content += \"@supports (\".concat(item[4], \") {\");\n }\n if (item[2]) {\n content += \"@media \".concat(item[2], \" {\");\n }\n if (needLayer) {\n content += \"@layer\".concat(item[5].length > 0 ? \" \".concat(item[5]) : \"\", \" {\");\n }\n content += cssWithMappingToString(item);\n if (needLayer) {\n content += \"}\";\n }\n if (item[2]) {\n content += \"}\";\n }\n if (item[4]) {\n content += \"}\";\n }\n return content;\n }).join(\"\");\n };\n\n // import a list of modules into the list\n list.i = function i(modules, media, dedupe, supports, layer) {\n if (typeof modules === \"string\") {\n modules = [[null, modules, undefined]];\n }\n var alreadyImportedModules = {};\n if (dedupe) {\n for (var k = 0; k < this.length; k++) {\n var id = this[k][0];\n if (id != null) {\n alreadyImportedModules[id] = true;\n }\n }\n }\n for (var _k = 0; _k < modules.length; _k++) {\n var item = [].concat(modules[_k]);\n if (dedupe && alreadyImportedModules[item[0]]) {\n continue;\n }\n if (typeof layer !== \"undefined\") {\n if (typeof item[5] === \"undefined\") {\n item[5] = layer;\n } else {\n item[1] = \"@layer\".concat(item[5].length > 0 ? \" \".concat(item[5]) : \"\", \" {\").concat(item[1], \"}\");\n item[5] = layer;\n }\n }\n if (media) {\n if (!item[2]) {\n item[2] = media;\n } else {\n item[1] = \"@media \".concat(item[2], \" {\").concat(item[1], \"}\");\n item[2] = media;\n }\n }\n if (supports) {\n if (!item[4]) {\n item[4] = \"\".concat(supports);\n } else {\n item[1] = \"@supports (\".concat(item[4], \") {\").concat(item[1], \"}\");\n item[4] = supports;\n }\n }\n list.push(item);\n }\n };\n return list;\n};","\"use strict\";\n\nmodule.exports = function (url, options) {\n if (!options) {\n options = {};\n }\n if (!url) {\n return url;\n }\n url = String(url.__esModule ? url.default : url);\n\n // If url is already wrapped in quotes, remove them\n if (/^['\"].*['\"]$/.test(url)) {\n url = url.slice(1, -1);\n }\n if (options.hash) {\n url += options.hash;\n }\n\n // Should url be wrapped?\n // See https://drafts.csswg.org/css-values-3/#urls\n if (/[\"'() \\t\\n]|(%20)/.test(url) || options.needQuotes) {\n return \"\\\"\".concat(url.replace(/\"/g, '\\\\\"').replace(/\\n/g, \"\\\\n\"), \"\\\"\");\n }\n return url;\n};","\"use strict\";\n\nmodule.exports = function (item) {\n var content = item[1];\n var cssMapping = item[3];\n if (!cssMapping) {\n return content;\n }\n if (typeof btoa === \"function\") {\n var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(cssMapping))));\n var data = \"sourceMappingURL=data:application/json;charset=utf-8;base64,\".concat(base64);\n var sourceMapping = \"/*# \".concat(data, \" */\");\n return [content].concat([sourceMapping]).join(\"\\n\");\n }\n return [content].join(\"\\n\");\n};","/**\n * @license\n * Lodash \n * Copyright OpenJS Foundation and other contributors \n * Released under MIT license \n * Based on Underscore.js 1.8.3 \n * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors\n */\n;(function() {\n\n /** Used as a safe reference for `undefined` in pre-ES5 environments. */\n var undefined;\n\n /** Used as the semantic version number. */\n var VERSION = '4.17.21';\n\n /** Used as the size to enable large array optimizations. */\n var LARGE_ARRAY_SIZE = 200;\n\n /** Error message constants. */\n var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',\n FUNC_ERROR_TEXT = 'Expected a function',\n INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`';\n\n /** Used to stand-in for `undefined` hash values. */\n var HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n /** Used as the maximum memoize cache size. */\n var MAX_MEMOIZE_SIZE = 500;\n\n /** Used as the internal argument placeholder. */\n var PLACEHOLDER = '__lodash_placeholder__';\n\n /** Used to compose bitmasks for cloning. */\n var CLONE_DEEP_FLAG = 1,\n CLONE_FLAT_FLAG = 2,\n CLONE_SYMBOLS_FLAG = 4;\n\n /** Used to compose bitmasks for value comparisons. */\n var COMPARE_PARTIAL_FLAG = 1,\n COMPARE_UNORDERED_FLAG = 2;\n\n /** Used to compose bitmasks for function metadata. */\n var WRAP_BIND_FLAG = 1,\n WRAP_BIND_KEY_FLAG = 2,\n WRAP_CURRY_BOUND_FLAG = 4,\n WRAP_CURRY_FLAG = 8,\n WRAP_CURRY_RIGHT_FLAG = 16,\n WRAP_PARTIAL_FLAG = 32,\n WRAP_PARTIAL_RIGHT_FLAG = 64,\n WRAP_ARY_FLAG = 128,\n WRAP_REARG_FLAG = 256,\n WRAP_FLIP_FLAG = 512;\n\n /** Used as default options for `_.truncate`. */\n var DEFAULT_TRUNC_LENGTH = 30,\n DEFAULT_TRUNC_OMISSION = '...';\n\n /** Used to detect hot functions by number of calls within a span of milliseconds. */\n var HOT_COUNT = 800,\n HOT_SPAN = 16;\n\n /** Used to indicate the type of lazy iteratees. */\n var LAZY_FILTER_FLAG = 1,\n LAZY_MAP_FLAG = 2,\n LAZY_WHILE_FLAG = 3;\n\n /** Used as references for various `Number` constants. */\n var INFINITY = 1 / 0,\n MAX_SAFE_INTEGER = 9007199254740991,\n MAX_INTEGER = 1.7976931348623157e+308,\n NAN = 0 / 0;\n\n /** Used as references for the maximum length and index of an array. */\n var MAX_ARRAY_LENGTH = 4294967295,\n MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,\n HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;\n\n /** Used to associate wrap methods with their bit flags. */\n var wrapFlags = [\n ['ary', WRAP_ARY_FLAG],\n ['bind', WRAP_BIND_FLAG],\n ['bindKey', WRAP_BIND_KEY_FLAG],\n ['curry', WRAP_CURRY_FLAG],\n ['curryRight', WRAP_CURRY_RIGHT_FLAG],\n ['flip', WRAP_FLIP_FLAG],\n ['partial', WRAP_PARTIAL_FLAG],\n ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],\n ['rearg', WRAP_REARG_FLAG]\n ];\n\n /** `Object#toString` result references. */\n var argsTag = '[object Arguments]',\n arrayTag = '[object Array]',\n asyncTag = '[object AsyncFunction]',\n boolTag = '[object Boolean]',\n dateTag = '[object Date]',\n domExcTag = '[object DOMException]',\n errorTag = '[object Error]',\n funcTag = '[object Function]',\n genTag = '[object GeneratorFunction]',\n mapTag = '[object Map]',\n numberTag = '[object Number]',\n nullTag = '[object Null]',\n objectTag = '[object Object]',\n promiseTag = '[object Promise]',\n proxyTag = '[object Proxy]',\n regexpTag = '[object RegExp]',\n setTag = '[object Set]',\n stringTag = '[object String]',\n symbolTag = '[object Symbol]',\n undefinedTag = '[object Undefined]',\n weakMapTag = '[object WeakMap]',\n weakSetTag = '[object WeakSet]';\n\n var arrayBufferTag = '[object ArrayBuffer]',\n dataViewTag = '[object DataView]',\n float32Tag = '[object Float32Array]',\n float64Tag = '[object Float64Array]',\n int8Tag = '[object Int8Array]',\n int16Tag = '[object Int16Array]',\n int32Tag = '[object Int32Array]',\n uint8Tag = '[object Uint8Array]',\n uint8ClampedTag = '[object Uint8ClampedArray]',\n uint16Tag = '[object Uint16Array]',\n uint32Tag = '[object Uint32Array]';\n\n /** Used to match empty string literals in compiled template source. */\n var reEmptyStringLeading = /\\b__p \\+= '';/g,\n reEmptyStringMiddle = /\\b(__p \\+=) '' \\+/g,\n reEmptyStringTrailing = /(__e\\(.*?\\)|\\b__t\\)) \\+\\n'';/g;\n\n /** Used to match HTML entities and HTML characters. */\n var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,\n reUnescapedHtml = /[&<>\"']/g,\n reHasEscapedHtml = RegExp(reEscapedHtml.source),\n reHasUnescapedHtml = RegExp(reUnescapedHtml.source);\n\n /** Used to match template delimiters. */\n var reEscape = /<%-([\\s\\S]+?)%>/g,\n reEvaluate = /<%([\\s\\S]+?)%>/g,\n reInterpolate = /<%=([\\s\\S]+?)%>/g;\n\n /** Used to match property names within property paths. */\n var reIsDeepProp = /\\.|\\[(?:[^[\\]]*|([\"'])(?:(?!\\1)[^\\\\]|\\\\.)*?\\1)\\]/,\n reIsPlainProp = /^\\w*$/,\n rePropName = /[^.[\\]]+|\\[(?:(-?\\d+(?:\\.\\d+)?)|([\"'])((?:(?!\\2)[^\\\\]|\\\\.)*?)\\2)\\]|(?=(?:\\.|\\[\\])(?:\\.|\\[\\]|$))/g;\n\n /**\n * Used to match `RegExp`\n * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).\n */\n var reRegExpChar = /[\\\\^$.*+?()[\\]{}|]/g,\n reHasRegExpChar = RegExp(reRegExpChar.source);\n\n /** Used to match leading whitespace. */\n var reTrimStart = /^\\s+/;\n\n /** Used to match a single whitespace character. */\n var reWhitespace = /\\s/;\n\n /** Used to match wrap detail comments. */\n var reWrapComment = /\\{(?:\\n\\/\\* \\[wrapped with .+\\] \\*\\/)?\\n?/,\n reWrapDetails = /\\{\\n\\/\\* \\[wrapped with (.+)\\] \\*/,\n reSplitDetails = /,? & /;\n\n /** Used to match words composed of alphanumeric characters. */\n var reAsciiWord = /[^\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\x7f]+/g;\n\n /**\n * Used to validate the `validate` option in `_.template` variable.\n *\n * Forbids characters which could potentially change the meaning of the function argument definition:\n * - \"(),\" (modification of function parameters)\n * - \"=\" (default value)\n * - \"[]{}\" (destructuring of function parameters)\n * - \"/\" (beginning of a comment)\n * - whitespace\n */\n var reForbiddenIdentifierChars = /[()=,{}\\[\\]\\/\\s]/;\n\n /** Used to match backslashes in property paths. */\n var reEscapeChar = /\\\\(\\\\)?/g;\n\n /**\n * Used to match\n * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).\n */\n var reEsTemplate = /\\$\\{([^\\\\}]*(?:\\\\.[^\\\\}]*)*)\\}/g;\n\n /** Used to match `RegExp` flags from their coerced string values. */\n var reFlags = /\\w*$/;\n\n /** Used to detect bad signed hexadecimal string values. */\n var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n /** Used to detect binary string values. */\n var reIsBinary = /^0b[01]+$/i;\n\n /** Used to detect host constructors (Safari). */\n var reIsHostCtor = /^\\[object .+?Constructor\\]$/;\n\n /** Used to detect octal string values. */\n var reIsOctal = /^0o[0-7]+$/i;\n\n /** Used to detect unsigned integer values. */\n var reIsUint = /^(?:0|[1-9]\\d*)$/;\n\n /** Used to match Latin Unicode letters (excluding mathematical operators). */\n var reLatin = /[\\xc0-\\xd6\\xd8-\\xf6\\xf8-\\xff\\u0100-\\u017f]/g;\n\n /** Used to ensure capturing order of template delimiters. */\n var reNoMatch = /($^)/;\n\n /** Used to match unescaped characters in compiled string literals. */\n var reUnescapedString = /['\\n\\r\\u2028\\u2029\\\\]/g;\n\n /** Used to compose unicode character classes. */\n var rsAstralRange = '\\\\ud800-\\\\udfff',\n rsComboMarksRange = '\\\\u0300-\\\\u036f',\n reComboHalfMarksRange = '\\\\ufe20-\\\\ufe2f',\n rsComboSymbolsRange = '\\\\u20d0-\\\\u20ff',\n rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,\n rsDingbatRange = '\\\\u2700-\\\\u27bf',\n rsLowerRange = 'a-z\\\\xdf-\\\\xf6\\\\xf8-\\\\xff',\n rsMathOpRange = '\\\\xac\\\\xb1\\\\xd7\\\\xf7',\n rsNonCharRange = '\\\\x00-\\\\x2f\\\\x3a-\\\\x40\\\\x5b-\\\\x60\\\\x7b-\\\\xbf',\n rsPunctuationRange = '\\\\u2000-\\\\u206f',\n rsSpaceRange = ' \\\\t\\\\x0b\\\\f\\\\xa0\\\\ufeff\\\\n\\\\r\\\\u2028\\\\u2029\\\\u1680\\\\u180e\\\\u2000\\\\u2001\\\\u2002\\\\u2003\\\\u2004\\\\u2005\\\\u2006\\\\u2007\\\\u2008\\\\u2009\\\\u200a\\\\u202f\\\\u205f\\\\u3000',\n rsUpperRange = 'A-Z\\\\xc0-\\\\xd6\\\\xd8-\\\\xde',\n rsVarRange = '\\\\ufe0e\\\\ufe0f',\n rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;\n\n /** Used to compose unicode capture groups. */\n var rsApos = \"['\\u2019]\",\n rsAstral = '[' + rsAstralRange + ']',\n rsBreak = '[' + rsBreakRange + ']',\n rsCombo = '[' + rsComboRange + ']',\n rsDigits = '\\\\d+',\n rsDingbat = '[' + rsDingbatRange + ']',\n rsLower = '[' + rsLowerRange + ']',\n rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',\n rsFitz = '\\\\ud83c[\\\\udffb-\\\\udfff]',\n rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',\n rsNonAstral = '[^' + rsAstralRange + ']',\n rsRegional = '(?:\\\\ud83c[\\\\udde6-\\\\uddff]){2}',\n rsSurrPair = '[\\\\ud800-\\\\udbff][\\\\udc00-\\\\udfff]',\n rsUpper = '[' + rsUpperRange + ']',\n rsZWJ = '\\\\u200d';\n\n /** Used to compose unicode regexes. */\n var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',\n rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',\n rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',\n rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',\n reOptMod = rsModifier + '?',\n rsOptVar = '[' + rsVarRange + ']?',\n rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',\n rsOrdLower = '\\\\d*(?:1st|2nd|3rd|(?![123])\\\\dth)(?=\\\\b|[A-Z_])',\n rsOrdUpper = '\\\\d*(?:1ST|2ND|3RD|(?![123])\\\\dTH)(?=\\\\b|[a-z_])',\n rsSeq = rsOptVar + reOptMod + rsOptJoin,\n rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,\n rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';\n\n /** Used to match apostrophes. */\n var reApos = RegExp(rsApos, 'g');\n\n /**\n * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and\n * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).\n */\n var reComboMark = RegExp(rsCombo, 'g');\n\n /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */\n var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');\n\n /** Used to match complex or compound words. */\n var reUnicodeWord = RegExp([\n rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',\n rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',\n rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,\n rsUpper + '+' + rsOptContrUpper,\n rsOrdUpper,\n rsOrdLower,\n rsDigits,\n rsEmoji\n ].join('|'), 'g');\n\n /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */\n var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');\n\n /** Used to detect strings that need a more robust regexp to match words. */\n var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;\n\n /** Used to assign default `context` object properties. */\n var contextProps = [\n 'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',\n 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',\n 'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',\n 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',\n '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'\n ];\n\n /** Used to make template sourceURLs easier to identify. */\n var templateCounter = -1;\n\n /** Used to identify `toStringTag` values of typed arrays. */\n var typedArrayTags = {};\n typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =\n typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =\n typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =\n typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =\n typedArrayTags[uint32Tag] = true;\n typedArrayTags[argsTag] = typedArrayTags[arrayTag] =\n typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =\n typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =\n typedArrayTags[errorTag] = typedArrayTags[funcTag] =\n typedArrayTags[mapTag] = typedArrayTags[numberTag] =\n typedArrayTags[objectTag] = typedArrayTags[regexpTag] =\n typedArrayTags[setTag] = typedArrayTags[stringTag] =\n typedArrayTags[weakMapTag] = false;\n\n /** Used to identify `toStringTag` values supported by `_.clone`. */\n var cloneableTags = {};\n cloneableTags[argsTag] = cloneableTags[arrayTag] =\n cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =\n cloneableTags[boolTag] = cloneableTags[dateTag] =\n cloneableTags[float32Tag] = cloneableTags[float64Tag] =\n cloneableTags[int8Tag] = cloneableTags[int16Tag] =\n cloneableTags[int32Tag] = cloneableTags[mapTag] =\n cloneableTags[numberTag] = cloneableTags[objectTag] =\n cloneableTags[regexpTag] = cloneableTags[setTag] =\n cloneableTags[stringTag] = cloneableTags[symbolTag] =\n cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =\n cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;\n cloneableTags[errorTag] = cloneableTags[funcTag] =\n cloneableTags[weakMapTag] = false;\n\n /** Used to map Latin Unicode letters to basic Latin letters. */\n var deburredLetters = {\n // Latin-1 Supplement block.\n '\\xc0': 'A', '\\xc1': 'A', '\\xc2': 'A', '\\xc3': 'A', '\\xc4': 'A', '\\xc5': 'A',\n '\\xe0': 'a', '\\xe1': 'a', '\\xe2': 'a', '\\xe3': 'a', '\\xe4': 'a', '\\xe5': 'a',\n '\\xc7': 'C', '\\xe7': 'c',\n '\\xd0': 'D', '\\xf0': 'd',\n '\\xc8': 'E', '\\xc9': 'E', '\\xca': 'E', '\\xcb': 'E',\n '\\xe8': 'e', '\\xe9': 'e', '\\xea': 'e', '\\xeb': 'e',\n '\\xcc': 'I', '\\xcd': 'I', '\\xce': 'I', '\\xcf': 'I',\n '\\xec': 'i', '\\xed': 'i', '\\xee': 'i', '\\xef': 'i',\n '\\xd1': 'N', '\\xf1': 'n',\n '\\xd2': 'O', '\\xd3': 'O', '\\xd4': 'O', '\\xd5': 'O', '\\xd6': 'O', '\\xd8': 'O',\n '\\xf2': 'o', '\\xf3': 'o', '\\xf4': 'o', '\\xf5': 'o', '\\xf6': 'o', '\\xf8': 'o',\n '\\xd9': 'U', '\\xda': 'U', '\\xdb': 'U', '\\xdc': 'U',\n '\\xf9': 'u', '\\xfa': 'u', '\\xfb': 'u', '\\xfc': 'u',\n '\\xdd': 'Y', '\\xfd': 'y', '\\xff': 'y',\n '\\xc6': 'Ae', '\\xe6': 'ae',\n '\\xde': 'Th', '\\xfe': 'th',\n '\\xdf': 'ss',\n // Latin Extended-A block.\n '\\u0100': 'A', '\\u0102': 'A', '\\u0104': 'A',\n '\\u0101': 'a', '\\u0103': 'a', '\\u0105': 'a',\n '\\u0106': 'C', '\\u0108': 'C', '\\u010a': 'C', '\\u010c': 'C',\n '\\u0107': 'c', '\\u0109': 'c', '\\u010b': 'c', '\\u010d': 'c',\n '\\u010e': 'D', '\\u0110': 'D', '\\u010f': 'd', '\\u0111': 'd',\n '\\u0112': 'E', '\\u0114': 'E', '\\u0116': 'E', '\\u0118': 'E', '\\u011a': 'E',\n '\\u0113': 'e', '\\u0115': 'e', '\\u0117': 'e', '\\u0119': 'e', '\\u011b': 'e',\n '\\u011c': 'G', '\\u011e': 'G', '\\u0120': 'G', '\\u0122': 'G',\n '\\u011d': 'g', '\\u011f': 'g', '\\u0121': 'g', '\\u0123': 'g',\n '\\u0124': 'H', '\\u0126': 'H', '\\u0125': 'h', '\\u0127': 'h',\n '\\u0128': 'I', '\\u012a': 'I', '\\u012c': 'I', '\\u012e': 'I', '\\u0130': 'I',\n '\\u0129': 'i', '\\u012b': 'i', '\\u012d': 'i', '\\u012f': 'i', '\\u0131': 'i',\n '\\u0134': 'J', '\\u0135': 'j',\n '\\u0136': 'K', '\\u0137': 'k', '\\u0138': 'k',\n '\\u0139': 'L', '\\u013b': 'L', '\\u013d': 'L', '\\u013f': 'L', '\\u0141': 'L',\n '\\u013a': 'l', '\\u013c': 'l', '\\u013e': 'l', '\\u0140': 'l', '\\u0142': 'l',\n '\\u0143': 'N', '\\u0145': 'N', '\\u0147': 'N', '\\u014a': 'N',\n '\\u0144': 'n', '\\u0146': 'n', '\\u0148': 'n', '\\u014b': 'n',\n '\\u014c': 'O', '\\u014e': 'O', '\\u0150': 'O',\n '\\u014d': 'o', '\\u014f': 'o', '\\u0151': 'o',\n '\\u0154': 'R', '\\u0156': 'R', '\\u0158': 'R',\n '\\u0155': 'r', '\\u0157': 'r', '\\u0159': 'r',\n '\\u015a': 'S', '\\u015c': 'S', '\\u015e': 'S', '\\u0160': 'S',\n '\\u015b': 's', '\\u015d': 's', '\\u015f': 's', '\\u0161': 's',\n '\\u0162': 'T', '\\u0164': 'T', '\\u0166': 'T',\n '\\u0163': 't', '\\u0165': 't', '\\u0167': 't',\n '\\u0168': 'U', '\\u016a': 'U', '\\u016c': 'U', '\\u016e': 'U', '\\u0170': 'U', '\\u0172': 'U',\n '\\u0169': 'u', '\\u016b': 'u', '\\u016d': 'u', '\\u016f': 'u', '\\u0171': 'u', '\\u0173': 'u',\n '\\u0174': 'W', '\\u0175': 'w',\n '\\u0176': 'Y', '\\u0177': 'y', '\\u0178': 'Y',\n '\\u0179': 'Z', '\\u017b': 'Z', '\\u017d': 'Z',\n '\\u017a': 'z', '\\u017c': 'z', '\\u017e': 'z',\n '\\u0132': 'IJ', '\\u0133': 'ij',\n '\\u0152': 'Oe', '\\u0153': 'oe',\n '\\u0149': \"'n\", '\\u017f': 's'\n };\n\n /** Used to map characters to HTML entities. */\n var htmlEscapes = {\n '&': '&',\n '<': '<',\n '>': '>',\n '\"': '"',\n \"'\": '''\n };\n\n /** Used to map HTML entities to characters. */\n var htmlUnescapes = {\n '&': '&',\n '<': '<',\n '>': '>',\n '"': '\"',\n ''': \"'\"\n };\n\n /** Used to escape characters for inclusion in compiled string literals. */\n var stringEscapes = {\n '\\\\': '\\\\',\n \"'\": \"'\",\n '\\n': 'n',\n '\\r': 'r',\n '\\u2028': 'u2028',\n '\\u2029': 'u2029'\n };\n\n /** Built-in method references without a dependency on `root`. */\n var freeParseFloat = parseFloat,\n freeParseInt = parseInt;\n\n /** Detect free variable `global` from Node.js. */\n var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;\n\n /** Detect free variable `self`. */\n var freeSelf = typeof self == 'object' && self && self.Object === Object && self;\n\n /** Used as a reference to the global object. */\n var root = freeGlobal || freeSelf || Function('return this')();\n\n /** Detect free variable `exports`. */\n var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;\n\n /** Detect free variable `module`. */\n var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;\n\n /** Detect the popular CommonJS extension `module.exports`. */\n var moduleExports = freeModule && freeModule.exports === freeExports;\n\n /** Detect free variable `process` from Node.js. */\n var freeProcess = moduleExports && freeGlobal.process;\n\n /** Used to access faster Node.js helpers. */\n var nodeUtil = (function() {\n try {\n // Use `util.types` for Node.js 10+.\n var types = freeModule && freeModule.require && freeModule.require('util').types;\n\n if (types) {\n return types;\n }\n\n // Legacy `process.binding('util')` for Node.js < 10.\n return freeProcess && freeProcess.binding && freeProcess.binding('util');\n } catch (e) {}\n }());\n\n /* Node.js helper references. */\n var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,\n nodeIsDate = nodeUtil && nodeUtil.isDate,\n nodeIsMap = nodeUtil && nodeUtil.isMap,\n nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,\n nodeIsSet = nodeUtil && nodeUtil.isSet,\n nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;\n\n /*--------------------------------------------------------------------------*/\n\n /**\n * A faster alternative to `Function#apply`, this function invokes `func`\n * with the `this` binding of `thisArg` and the arguments of `args`.\n *\n * @private\n * @param {Function} func The function to invoke.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {Array} args The arguments to invoke `func` with.\n * @returns {*} Returns the result of `func`.\n */\n function apply(func, thisArg, args) {\n switch (args.length) {\n case 0: return func.call(thisArg);\n case 1: return func.call(thisArg, args[0]);\n case 2: return func.call(thisArg, args[0], args[1]);\n case 3: return func.call(thisArg, args[0], args[1], args[2]);\n }\n return func.apply(thisArg, args);\n }\n\n /**\n * A specialized version of `baseAggregator` for arrays.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} setter The function to set `accumulator` values.\n * @param {Function} iteratee The iteratee to transform keys.\n * @param {Object} accumulator The initial aggregated object.\n * @returns {Function} Returns `accumulator`.\n */\n function arrayAggregator(array, setter, iteratee, accumulator) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n var value = array[index];\n setter(accumulator, value, iteratee(value), array);\n }\n return accumulator;\n }\n\n /**\n * A specialized version of `_.forEach` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns `array`.\n */\n function arrayEach(array, iteratee) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (iteratee(array[index], index, array) === false) {\n break;\n }\n }\n return array;\n }\n\n /**\n * A specialized version of `_.forEachRight` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns `array`.\n */\n function arrayEachRight(array, iteratee) {\n var length = array == null ? 0 : array.length;\n\n while (length--) {\n if (iteratee(array[length], length, array) === false) {\n break;\n }\n }\n return array;\n }\n\n /**\n * A specialized version of `_.every` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if all elements pass the predicate check,\n * else `false`.\n */\n function arrayEvery(array, predicate) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (!predicate(array[index], index, array)) {\n return false;\n }\n }\n return true;\n }\n\n /**\n * A specialized version of `_.filter` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n */\n function arrayFilter(array, predicate) {\n var index = -1,\n length = array == null ? 0 : array.length,\n resIndex = 0,\n result = [];\n\n while (++index < length) {\n var value = array[index];\n if (predicate(value, index, array)) {\n result[resIndex++] = value;\n }\n }\n return result;\n }\n\n /**\n * A specialized version of `_.includes` for arrays without support for\n * specifying an index to search from.\n *\n * @private\n * @param {Array} [array] The array to inspect.\n * @param {*} target The value to search for.\n * @returns {boolean} Returns `true` if `target` is found, else `false`.\n */\n function arrayIncludes(array, value) {\n var length = array == null ? 0 : array.length;\n return !!length && baseIndexOf(array, value, 0) > -1;\n }\n\n /**\n * This function is like `arrayIncludes` except that it accepts a comparator.\n *\n * @private\n * @param {Array} [array] The array to inspect.\n * @param {*} target The value to search for.\n * @param {Function} comparator The comparator invoked per element.\n * @returns {boolean} Returns `true` if `target` is found, else `false`.\n */\n function arrayIncludesWith(array, value, comparator) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (comparator(value, array[index])) {\n return true;\n }\n }\n return false;\n }\n\n /**\n * A specialized version of `_.map` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the new mapped array.\n */\n function arrayMap(array, iteratee) {\n var index = -1,\n length = array == null ? 0 : array.length,\n result = Array(length);\n\n while (++index < length) {\n result[index] = iteratee(array[index], index, array);\n }\n return result;\n }\n\n /**\n * Appends the elements of `values` to `array`.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to append.\n * @returns {Array} Returns `array`.\n */\n function arrayPush(array, values) {\n var index = -1,\n length = values.length,\n offset = array.length;\n\n while (++index < length) {\n array[offset + index] = values[index];\n }\n return array;\n }\n\n /**\n * A specialized version of `_.reduce` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {*} [accumulator] The initial value.\n * @param {boolean} [initAccum] Specify using the first element of `array` as\n * the initial value.\n * @returns {*} Returns the accumulated value.\n */\n function arrayReduce(array, iteratee, accumulator, initAccum) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n if (initAccum && length) {\n accumulator = array[++index];\n }\n while (++index < length) {\n accumulator = iteratee(accumulator, array[index], index, array);\n }\n return accumulator;\n }\n\n /**\n * A specialized version of `_.reduceRight` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {*} [accumulator] The initial value.\n * @param {boolean} [initAccum] Specify using the last element of `array` as\n * the initial value.\n * @returns {*} Returns the accumulated value.\n */\n function arrayReduceRight(array, iteratee, accumulator, initAccum) {\n var length = array == null ? 0 : array.length;\n if (initAccum && length) {\n accumulator = array[--length];\n }\n while (length--) {\n accumulator = iteratee(accumulator, array[length], length, array);\n }\n return accumulator;\n }\n\n /**\n * A specialized version of `_.some` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n * else `false`.\n */\n function arraySome(array, predicate) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (predicate(array[index], index, array)) {\n return true;\n }\n }\n return false;\n }\n\n /**\n * Gets the size of an ASCII `string`.\n *\n * @private\n * @param {string} string The string inspect.\n * @returns {number} Returns the string size.\n */\n var asciiSize = baseProperty('length');\n\n /**\n * Converts an ASCII `string` to an array.\n *\n * @private\n * @param {string} string The string to convert.\n * @returns {Array} Returns the converted array.\n */\n function asciiToArray(string) {\n return string.split('');\n }\n\n /**\n * Splits an ASCII `string` into an array of its words.\n *\n * @private\n * @param {string} The string to inspect.\n * @returns {Array} Returns the words of `string`.\n */\n function asciiWords(string) {\n return string.match(reAsciiWord) || [];\n }\n\n /**\n * The base implementation of methods like `_.findKey` and `_.findLastKey`,\n * without support for iteratee shorthands, which iterates over `collection`\n * using `eachFunc`.\n *\n * @private\n * @param {Array|Object} collection The collection to inspect.\n * @param {Function} predicate The function invoked per iteration.\n * @param {Function} eachFunc The function to iterate over `collection`.\n * @returns {*} Returns the found element or its key, else `undefined`.\n */\n function baseFindKey(collection, predicate, eachFunc) {\n var result;\n eachFunc(collection, function(value, key, collection) {\n if (predicate(value, key, collection)) {\n result = key;\n return false;\n }\n });\n return result;\n }\n\n /**\n * The base implementation of `_.findIndex` and `_.findLastIndex` without\n * support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Function} predicate The function invoked per iteration.\n * @param {number} fromIndex The index to search from.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\n function baseFindIndex(array, predicate, fromIndex, fromRight) {\n var length = array.length,\n index = fromIndex + (fromRight ? 1 : -1);\n\n while ((fromRight ? index-- : ++index < length)) {\n if (predicate(array[index], index, array)) {\n return index;\n }\n }\n return -1;\n }\n\n /**\n * The base implementation of `_.indexOf` without `fromIndex` bounds checks.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\n function baseIndexOf(array, value, fromIndex) {\n return value === value\n ? strictIndexOf(array, value, fromIndex)\n : baseFindIndex(array, baseIsNaN, fromIndex);\n }\n\n /**\n * This function is like `baseIndexOf` except that it accepts a comparator.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @param {Function} comparator The comparator invoked per element.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\n function baseIndexOfWith(array, value, fromIndex, comparator) {\n var index = fromIndex - 1,\n length = array.length;\n\n while (++index < length) {\n if (comparator(array[index], value)) {\n return index;\n }\n }\n return -1;\n }\n\n /**\n * The base implementation of `_.isNaN` without support for number objects.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.\n */\n function baseIsNaN(value) {\n return value !== value;\n }\n\n /**\n * The base implementation of `_.mean` and `_.meanBy` without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {number} Returns the mean.\n */\n function baseMean(array, iteratee) {\n var length = array == null ? 0 : array.length;\n return length ? (baseSum(array, iteratee) / length) : NAN;\n }\n\n /**\n * The base implementation of `_.property` without support for deep paths.\n *\n * @private\n * @param {string} key The key of the property to get.\n * @returns {Function} Returns the new accessor function.\n */\n function baseProperty(key) {\n return function(object) {\n return object == null ? undefined : object[key];\n };\n }\n\n /**\n * The base implementation of `_.propertyOf` without support for deep paths.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Function} Returns the new accessor function.\n */\n function basePropertyOf(object) {\n return function(key) {\n return object == null ? undefined : object[key];\n };\n }\n\n /**\n * The base implementation of `_.reduce` and `_.reduceRight`, without support\n * for iteratee shorthands, which iterates over `collection` using `eachFunc`.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {*} accumulator The initial value.\n * @param {boolean} initAccum Specify using the first or last element of\n * `collection` as the initial value.\n * @param {Function} eachFunc The function to iterate over `collection`.\n * @returns {*} Returns the accumulated value.\n */\n function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {\n eachFunc(collection, function(value, index, collection) {\n accumulator = initAccum\n ? (initAccum = false, value)\n : iteratee(accumulator, value, index, collection);\n });\n return accumulator;\n }\n\n /**\n * The base implementation of `_.sortBy` which uses `comparer` to define the\n * sort order of `array` and replaces criteria objects with their corresponding\n * values.\n *\n * @private\n * @param {Array} array The array to sort.\n * @param {Function} comparer The function to define sort order.\n * @returns {Array} Returns `array`.\n */\n function baseSortBy(array, comparer) {\n var length = array.length;\n\n array.sort(comparer);\n while (length--) {\n array[length] = array[length].value;\n }\n return array;\n }\n\n /**\n * The base implementation of `_.sum` and `_.sumBy` without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {number} Returns the sum.\n */\n function baseSum(array, iteratee) {\n var result,\n index = -1,\n length = array.length;\n\n while (++index < length) {\n var current = iteratee(array[index]);\n if (current !== undefined) {\n result = result === undefined ? current : (result + current);\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.times` without support for iteratee shorthands\n * or max array length checks.\n *\n * @private\n * @param {number} n The number of times to invoke `iteratee`.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the array of results.\n */\n function baseTimes(n, iteratee) {\n var index = -1,\n result = Array(n);\n\n while (++index < n) {\n result[index] = iteratee(index);\n }\n return result;\n }\n\n /**\n * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array\n * of key-value pairs for `object` corresponding to the property names of `props`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array} props The property names to get values for.\n * @returns {Object} Returns the key-value pairs.\n */\n function baseToPairs(object, props) {\n return arrayMap(props, function(key) {\n return [key, object[key]];\n });\n }\n\n /**\n * The base implementation of `_.trim`.\n *\n * @private\n * @param {string} string The string to trim.\n * @returns {string} Returns the trimmed string.\n */\n function baseTrim(string) {\n return string\n ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, '')\n : string;\n }\n\n /**\n * The base implementation of `_.unary` without support for storing metadata.\n *\n * @private\n * @param {Function} func The function to cap arguments for.\n * @returns {Function} Returns the new capped function.\n */\n function baseUnary(func) {\n return function(value) {\n return func(value);\n };\n }\n\n /**\n * The base implementation of `_.values` and `_.valuesIn` which creates an\n * array of `object` property values corresponding to the property names\n * of `props`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array} props The property names to get values for.\n * @returns {Object} Returns the array of property values.\n */\n function baseValues(object, props) {\n return arrayMap(props, function(key) {\n return object[key];\n });\n }\n\n /**\n * Checks if a `cache` value for `key` exists.\n *\n * @private\n * @param {Object} cache The cache to query.\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\n function cacheHas(cache, key) {\n return cache.has(key);\n }\n\n /**\n * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol\n * that is not found in the character symbols.\n *\n * @private\n * @param {Array} strSymbols The string symbols to inspect.\n * @param {Array} chrSymbols The character symbols to find.\n * @returns {number} Returns the index of the first unmatched string symbol.\n */\n function charsStartIndex(strSymbols, chrSymbols) {\n var index = -1,\n length = strSymbols.length;\n\n while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}\n return index;\n }\n\n /**\n * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol\n * that is not found in the character symbols.\n *\n * @private\n * @param {Array} strSymbols The string symbols to inspect.\n * @param {Array} chrSymbols The character symbols to find.\n * @returns {number} Returns the index of the last unmatched string symbol.\n */\n function charsEndIndex(strSymbols, chrSymbols) {\n var index = strSymbols.length;\n\n while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}\n return index;\n }\n\n /**\n * Gets the number of `placeholder` occurrences in `array`.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} placeholder The placeholder to search for.\n * @returns {number} Returns the placeholder count.\n */\n function countHolders(array, placeholder) {\n var length = array.length,\n result = 0;\n\n while (length--) {\n if (array[length] === placeholder) {\n ++result;\n }\n }\n return result;\n }\n\n /**\n * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A\n * letters to basic Latin letters.\n *\n * @private\n * @param {string} letter The matched letter to deburr.\n * @returns {string} Returns the deburred letter.\n */\n var deburrLetter = basePropertyOf(deburredLetters);\n\n /**\n * Used by `_.escape` to convert characters to HTML entities.\n *\n * @private\n * @param {string} chr The matched character to escape.\n * @returns {string} Returns the escaped character.\n */\n var escapeHtmlChar = basePropertyOf(htmlEscapes);\n\n /**\n * Used by `_.template` to escape characters for inclusion in compiled string literals.\n *\n * @private\n * @param {string} chr The matched character to escape.\n * @returns {string} Returns the escaped character.\n */\n function escapeStringChar(chr) {\n return '\\\\' + stringEscapes[chr];\n }\n\n /**\n * Gets the value at `key` of `object`.\n *\n * @private\n * @param {Object} [object] The object to query.\n * @param {string} key The key of the property to get.\n * @returns {*} Returns the property value.\n */\n function getValue(object, key) {\n return object == null ? undefined : object[key];\n }\n\n /**\n * Checks if `string` contains Unicode symbols.\n *\n * @private\n * @param {string} string The string to inspect.\n * @returns {boolean} Returns `true` if a symbol is found, else `false`.\n */\n function hasUnicode(string) {\n return reHasUnicode.test(string);\n }\n\n /**\n * Checks if `string` contains a word composed of Unicode symbols.\n *\n * @private\n * @param {string} string The string to inspect.\n * @returns {boolean} Returns `true` if a word is found, else `false`.\n */\n function hasUnicodeWord(string) {\n return reHasUnicodeWord.test(string);\n }\n\n /**\n * Converts `iterator` to an array.\n *\n * @private\n * @param {Object} iterator The iterator to convert.\n * @returns {Array} Returns the converted array.\n */\n function iteratorToArray(iterator) {\n var data,\n result = [];\n\n while (!(data = iterator.next()).done) {\n result.push(data.value);\n }\n return result;\n }\n\n /**\n * Converts `map` to its key-value pairs.\n *\n * @private\n * @param {Object} map The map to convert.\n * @returns {Array} Returns the key-value pairs.\n */\n function mapToArray(map) {\n var index = -1,\n result = Array(map.size);\n\n map.forEach(function(value, key) {\n result[++index] = [key, value];\n });\n return result;\n }\n\n /**\n * Creates a unary function that invokes `func` with its argument transformed.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {Function} transform The argument transform.\n * @returns {Function} Returns the new function.\n */\n function overArg(func, transform) {\n return function(arg) {\n return func(transform(arg));\n };\n }\n\n /**\n * Replaces all `placeholder` elements in `array` with an internal placeholder\n * and returns an array of their indexes.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {*} placeholder The placeholder to replace.\n * @returns {Array} Returns the new array of placeholder indexes.\n */\n function replaceHolders(array, placeholder) {\n var index = -1,\n length = array.length,\n resIndex = 0,\n result = [];\n\n while (++index < length) {\n var value = array[index];\n if (value === placeholder || value === PLACEHOLDER) {\n array[index] = PLACEHOLDER;\n result[resIndex++] = index;\n }\n }\n return result;\n }\n\n /**\n * Converts `set` to an array of its values.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the values.\n */\n function setToArray(set) {\n var index = -1,\n result = Array(set.size);\n\n set.forEach(function(value) {\n result[++index] = value;\n });\n return result;\n }\n\n /**\n * Converts `set` to its value-value pairs.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the value-value pairs.\n */\n function setToPairs(set) {\n var index = -1,\n result = Array(set.size);\n\n set.forEach(function(value) {\n result[++index] = [value, value];\n });\n return result;\n }\n\n /**\n * A specialized version of `_.indexOf` which performs strict equality\n * comparisons of values, i.e. `===`.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\n function strictIndexOf(array, value, fromIndex) {\n var index = fromIndex - 1,\n length = array.length;\n\n while (++index < length) {\n if (array[index] === value) {\n return index;\n }\n }\n return -1;\n }\n\n /**\n * A specialized version of `_.lastIndexOf` which performs strict equality\n * comparisons of values, i.e. `===`.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\n function strictLastIndexOf(array, value, fromIndex) {\n var index = fromIndex + 1;\n while (index--) {\n if (array[index] === value) {\n return index;\n }\n }\n return index;\n }\n\n /**\n * Gets the number of symbols in `string`.\n *\n * @private\n * @param {string} string The string to inspect.\n * @returns {number} Returns the string size.\n */\n function stringSize(string) {\n return hasUnicode(string)\n ? unicodeSize(string)\n : asciiSize(string);\n }\n\n /**\n * Converts `string` to an array.\n *\n * @private\n * @param {string} string The string to convert.\n * @returns {Array} Returns the converted array.\n */\n function stringToArray(string) {\n return hasUnicode(string)\n ? unicodeToArray(string)\n : asciiToArray(string);\n }\n\n /**\n * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace\n * character of `string`.\n *\n * @private\n * @param {string} string The string to inspect.\n * @returns {number} Returns the index of the last non-whitespace character.\n */\n function trimmedEndIndex(string) {\n var index = string.length;\n\n while (index-- && reWhitespace.test(string.charAt(index))) {}\n return index;\n }\n\n /**\n * Used by `_.unescape` to convert HTML entities to characters.\n *\n * @private\n * @param {string} chr The matched character to unescape.\n * @returns {string} Returns the unescaped character.\n */\n var unescapeHtmlChar = basePropertyOf(htmlUnescapes);\n\n /**\n * Gets the size of a Unicode `string`.\n *\n * @private\n * @param {string} string The string inspect.\n * @returns {number} Returns the string size.\n */\n function unicodeSize(string) {\n var result = reUnicode.lastIndex = 0;\n while (reUnicode.test(string)) {\n ++result;\n }\n return result;\n }\n\n /**\n * Converts a Unicode `string` to an array.\n *\n * @private\n * @param {string} string The string to convert.\n * @returns {Array} Returns the converted array.\n */\n function unicodeToArray(string) {\n return string.match(reUnicode) || [];\n }\n\n /**\n * Splits a Unicode `string` into an array of its words.\n *\n * @private\n * @param {string} The string to inspect.\n * @returns {Array} Returns the words of `string`.\n */\n function unicodeWords(string) {\n return string.match(reUnicodeWord) || [];\n }\n\n /*--------------------------------------------------------------------------*/\n\n /**\n * Create a new pristine `lodash` function using the `context` object.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category Util\n * @param {Object} [context=root] The context object.\n * @returns {Function} Returns a new `lodash` function.\n * @example\n *\n * _.mixin({ 'foo': _.constant('foo') });\n *\n * var lodash = _.runInContext();\n * lodash.mixin({ 'bar': lodash.constant('bar') });\n *\n * _.isFunction(_.foo);\n * // => true\n * _.isFunction(_.bar);\n * // => false\n *\n * lodash.isFunction(lodash.foo);\n * // => false\n * lodash.isFunction(lodash.bar);\n * // => true\n *\n * // Create a suped-up `defer` in Node.js.\n * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;\n */\n var runInContext = (function runInContext(context) {\n context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));\n\n /** Built-in constructor references. */\n var Array = context.Array,\n Date = context.Date,\n Error = context.Error,\n Function = context.Function,\n Math = context.Math,\n Object = context.Object,\n RegExp = context.RegExp,\n String = context.String,\n TypeError = context.TypeError;\n\n /** Used for built-in method references. */\n var arrayProto = Array.prototype,\n funcProto = Function.prototype,\n objectProto = Object.prototype;\n\n /** Used to detect overreaching core-js shims. */\n var coreJsData = context['__core-js_shared__'];\n\n /** Used to resolve the decompiled source of functions. */\n var funcToString = funcProto.toString;\n\n /** Used to check objects for own properties. */\n var hasOwnProperty = objectProto.hasOwnProperty;\n\n /** Used to generate unique IDs. */\n var idCounter = 0;\n\n /** Used to detect methods masquerading as native. */\n var maskSrcKey = (function() {\n var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');\n return uid ? ('Symbol(src)_1.' + uid) : '';\n }());\n\n /**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\n var nativeObjectToString = objectProto.toString;\n\n /** Used to infer the `Object` constructor. */\n var objectCtorString = funcToString.call(Object);\n\n /** Used to restore the original `_` reference in `_.noConflict`. */\n var oldDash = root._;\n\n /** Used to detect if a method is native. */\n var reIsNative = RegExp('^' +\n funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\\\$&')\n .replace(/hasOwnProperty|(function).*?(?=\\\\\\()| for .+?(?=\\\\\\])/g, '$1.*?') + '$'\n );\n\n /** Built-in value references. */\n var Buffer = moduleExports ? context.Buffer : undefined,\n Symbol = context.Symbol,\n Uint8Array = context.Uint8Array,\n allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,\n getPrototype = overArg(Object.getPrototypeOf, Object),\n objectCreate = Object.create,\n propertyIsEnumerable = objectProto.propertyIsEnumerable,\n splice = arrayProto.splice,\n spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,\n symIterator = Symbol ? Symbol.iterator : undefined,\n symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n var defineProperty = (function() {\n try {\n var func = getNative(Object, 'defineProperty');\n func({}, '', {});\n return func;\n } catch (e) {}\n }());\n\n /** Mocked built-ins. */\n var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,\n ctxNow = Date && Date.now !== root.Date.now && Date.now,\n ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;\n\n /* Built-in method references for those with the same name as other `lodash` methods. */\n var nativeCeil = Math.ceil,\n nativeFloor = Math.floor,\n nativeGetSymbols = Object.getOwnPropertySymbols,\n nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,\n nativeIsFinite = context.isFinite,\n nativeJoin = arrayProto.join,\n nativeKeys = overArg(Object.keys, Object),\n nativeMax = Math.max,\n nativeMin = Math.min,\n nativeNow = Date.now,\n nativeParseInt = context.parseInt,\n nativeRandom = Math.random,\n nativeReverse = arrayProto.reverse;\n\n /* Built-in method references that are verified to be native. */\n var DataView = getNative(context, 'DataView'),\n Map = getNative(context, 'Map'),\n Promise = getNative(context, 'Promise'),\n Set = getNative(context, 'Set'),\n WeakMap = getNative(context, 'WeakMap'),\n nativeCreate = getNative(Object, 'create');\n\n /** Used to store function metadata. */\n var metaMap = WeakMap && new WeakMap;\n\n /** Used to lookup unminified function names. */\n var realNames = {};\n\n /** Used to detect maps, sets, and weakmaps. */\n var dataViewCtorString = toSource(DataView),\n mapCtorString = toSource(Map),\n promiseCtorString = toSource(Promise),\n setCtorString = toSource(Set),\n weakMapCtorString = toSource(WeakMap);\n\n /** Used to convert symbols to primitives and strings. */\n var symbolProto = Symbol ? Symbol.prototype : undefined,\n symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,\n symbolToString = symbolProto ? symbolProto.toString : undefined;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates a `lodash` object which wraps `value` to enable implicit method\n * chain sequences. Methods that operate on and return arrays, collections,\n * and functions can be chained together. Methods that retrieve a single value\n * or may return a primitive value will automatically end the chain sequence\n * and return the unwrapped value. Otherwise, the value must be unwrapped\n * with `_#value`.\n *\n * Explicit chain sequences, which must be unwrapped with `_#value`, may be\n * enabled using `_.chain`.\n *\n * The execution of chained methods is lazy, that is, it's deferred until\n * `_#value` is implicitly or explicitly called.\n *\n * Lazy evaluation allows several methods to support shortcut fusion.\n * Shortcut fusion is an optimization to merge iteratee calls; this avoids\n * the creation of intermediate arrays and can greatly reduce the number of\n * iteratee executions. Sections of a chain sequence qualify for shortcut\n * fusion if the section is applied to an array and iteratees accept only\n * one argument. The heuristic for whether a section qualifies for shortcut\n * fusion is subject to change.\n *\n * Chaining is supported in custom builds as long as the `_#value` method is\n * directly or indirectly included in the build.\n *\n * In addition to lodash methods, wrappers have `Array` and `String` methods.\n *\n * The wrapper `Array` methods are:\n * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`\n *\n * The wrapper `String` methods are:\n * `replace` and `split`\n *\n * The wrapper methods that support shortcut fusion are:\n * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,\n * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,\n * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`\n *\n * The chainable wrapper methods are:\n * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,\n * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,\n * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,\n * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,\n * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,\n * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,\n * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,\n * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,\n * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,\n * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,\n * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,\n * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,\n * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,\n * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,\n * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,\n * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,\n * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,\n * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,\n * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,\n * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,\n * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,\n * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,\n * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,\n * `zipObject`, `zipObjectDeep`, and `zipWith`\n *\n * The wrapper methods that are **not** chainable by default are:\n * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,\n * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,\n * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,\n * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,\n * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,\n * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,\n * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,\n * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,\n * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,\n * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,\n * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,\n * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,\n * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,\n * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,\n * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,\n * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,\n * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,\n * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,\n * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,\n * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,\n * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,\n * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,\n * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,\n * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,\n * `upperFirst`, `value`, and `words`\n *\n * @name _\n * @constructor\n * @category Seq\n * @param {*} value The value to wrap in a `lodash` instance.\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * function square(n) {\n * return n * n;\n * }\n *\n * var wrapped = _([1, 2, 3]);\n *\n * // Returns an unwrapped value.\n * wrapped.reduce(_.add);\n * // => 6\n *\n * // Returns a wrapped value.\n * var squares = wrapped.map(square);\n *\n * _.isArray(squares);\n * // => false\n *\n * _.isArray(squares.value());\n * // => true\n */\n function lodash(value) {\n if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {\n if (value instanceof LodashWrapper) {\n return value;\n }\n if (hasOwnProperty.call(value, '__wrapped__')) {\n return wrapperClone(value);\n }\n }\n return new LodashWrapper(value);\n }\n\n /**\n * The base implementation of `_.create` without support for assigning\n * properties to the created object.\n *\n * @private\n * @param {Object} proto The object to inherit from.\n * @returns {Object} Returns the new object.\n */\n var baseCreate = (function() {\n function object() {}\n return function(proto) {\n if (!isObject(proto)) {\n return {};\n }\n if (objectCreate) {\n return objectCreate(proto);\n }\n object.prototype = proto;\n var result = new object;\n object.prototype = undefined;\n return result;\n };\n }());\n\n /**\n * The function whose prototype chain sequence wrappers inherit from.\n *\n * @private\n */\n function baseLodash() {\n // No operation performed.\n }\n\n /**\n * The base constructor for creating `lodash` wrapper objects.\n *\n * @private\n * @param {*} value The value to wrap.\n * @param {boolean} [chainAll] Enable explicit method chain sequences.\n */\n function LodashWrapper(value, chainAll) {\n this.__wrapped__ = value;\n this.__actions__ = [];\n this.__chain__ = !!chainAll;\n this.__index__ = 0;\n this.__values__ = undefined;\n }\n\n /**\n * By default, the template delimiters used by lodash are like those in\n * embedded Ruby (ERB) as well as ES2015 template strings. Change the\n * following template settings to use alternative delimiters.\n *\n * @static\n * @memberOf _\n * @type {Object}\n */\n lodash.templateSettings = {\n\n /**\n * Used to detect `data` property values to be HTML-escaped.\n *\n * @memberOf _.templateSettings\n * @type {RegExp}\n */\n 'escape': reEscape,\n\n /**\n * Used to detect code to be evaluated.\n *\n * @memberOf _.templateSettings\n * @type {RegExp}\n */\n 'evaluate': reEvaluate,\n\n /**\n * Used to detect `data` property values to inject.\n *\n * @memberOf _.templateSettings\n * @type {RegExp}\n */\n 'interpolate': reInterpolate,\n\n /**\n * Used to reference the data object in the template text.\n *\n * @memberOf _.templateSettings\n * @type {string}\n */\n 'variable': '',\n\n /**\n * Used to import variables into the compiled template.\n *\n * @memberOf _.templateSettings\n * @type {Object}\n */\n 'imports': {\n\n /**\n * A reference to the `lodash` function.\n *\n * @memberOf _.templateSettings.imports\n * @type {Function}\n */\n '_': lodash\n }\n };\n\n // Ensure wrappers are instances of `baseLodash`.\n lodash.prototype = baseLodash.prototype;\n lodash.prototype.constructor = lodash;\n\n LodashWrapper.prototype = baseCreate(baseLodash.prototype);\n LodashWrapper.prototype.constructor = LodashWrapper;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.\n *\n * @private\n * @constructor\n * @param {*} value The value to wrap.\n */\n function LazyWrapper(value) {\n this.__wrapped__ = value;\n this.__actions__ = [];\n this.__dir__ = 1;\n this.__filtered__ = false;\n this.__iteratees__ = [];\n this.__takeCount__ = MAX_ARRAY_LENGTH;\n this.__views__ = [];\n }\n\n /**\n * Creates a clone of the lazy wrapper object.\n *\n * @private\n * @name clone\n * @memberOf LazyWrapper\n * @returns {Object} Returns the cloned `LazyWrapper` object.\n */\n function lazyClone() {\n var result = new LazyWrapper(this.__wrapped__);\n result.__actions__ = copyArray(this.__actions__);\n result.__dir__ = this.__dir__;\n result.__filtered__ = this.__filtered__;\n result.__iteratees__ = copyArray(this.__iteratees__);\n result.__takeCount__ = this.__takeCount__;\n result.__views__ = copyArray(this.__views__);\n return result;\n }\n\n /**\n * Reverses the direction of lazy iteration.\n *\n * @private\n * @name reverse\n * @memberOf LazyWrapper\n * @returns {Object} Returns the new reversed `LazyWrapper` object.\n */\n function lazyReverse() {\n if (this.__filtered__) {\n var result = new LazyWrapper(this);\n result.__dir__ = -1;\n result.__filtered__ = true;\n } else {\n result = this.clone();\n result.__dir__ *= -1;\n }\n return result;\n }\n\n /**\n * Extracts the unwrapped value from its lazy wrapper.\n *\n * @private\n * @name value\n * @memberOf LazyWrapper\n * @returns {*} Returns the unwrapped value.\n */\n function lazyValue() {\n var array = this.__wrapped__.value(),\n dir = this.__dir__,\n isArr = isArray(array),\n isRight = dir < 0,\n arrLength = isArr ? array.length : 0,\n view = getView(0, arrLength, this.__views__),\n start = view.start,\n end = view.end,\n length = end - start,\n index = isRight ? end : (start - 1),\n iteratees = this.__iteratees__,\n iterLength = iteratees.length,\n resIndex = 0,\n takeCount = nativeMin(length, this.__takeCount__);\n\n if (!isArr || (!isRight && arrLength == length && takeCount == length)) {\n return baseWrapperValue(array, this.__actions__);\n }\n var result = [];\n\n outer:\n while (length-- && resIndex < takeCount) {\n index += dir;\n\n var iterIndex = -1,\n value = array[index];\n\n while (++iterIndex < iterLength) {\n var data = iteratees[iterIndex],\n iteratee = data.iteratee,\n type = data.type,\n computed = iteratee(value);\n\n if (type == LAZY_MAP_FLAG) {\n value = computed;\n } else if (!computed) {\n if (type == LAZY_FILTER_FLAG) {\n continue outer;\n } else {\n break outer;\n }\n }\n }\n result[resIndex++] = value;\n }\n return result;\n }\n\n // Ensure `LazyWrapper` is an instance of `baseLodash`.\n LazyWrapper.prototype = baseCreate(baseLodash.prototype);\n LazyWrapper.prototype.constructor = LazyWrapper;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates a hash object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\n function Hash(entries) {\n var index = -1,\n length = entries == null ? 0 : entries.length;\n\n this.clear();\n while (++index < length) {\n var entry = entries[index];\n this.set(entry[0], entry[1]);\n }\n }\n\n /**\n * Removes all key-value entries from the hash.\n *\n * @private\n * @name clear\n * @memberOf Hash\n */\n function hashClear() {\n this.__data__ = nativeCreate ? nativeCreate(null) : {};\n this.size = 0;\n }\n\n /**\n * Removes `key` and its value from the hash.\n *\n * @private\n * @name delete\n * @memberOf Hash\n * @param {Object} hash The hash to modify.\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\n function hashDelete(key) {\n var result = this.has(key) && delete this.__data__[key];\n this.size -= result ? 1 : 0;\n return result;\n }\n\n /**\n * Gets the hash value for `key`.\n *\n * @private\n * @name get\n * @memberOf Hash\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\n function hashGet(key) {\n var data = this.__data__;\n if (nativeCreate) {\n var result = data[key];\n return result === HASH_UNDEFINED ? undefined : result;\n }\n return hasOwnProperty.call(data, key) ? data[key] : undefined;\n }\n\n /**\n * Checks if a hash value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Hash\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\n function hashHas(key) {\n var data = this.__data__;\n return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);\n }\n\n /**\n * Sets the hash `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Hash\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the hash instance.\n */\n function hashSet(key, value) {\n var data = this.__data__;\n this.size += this.has(key) ? 0 : 1;\n data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;\n return this;\n }\n\n // Add methods to `Hash`.\n Hash.prototype.clear = hashClear;\n Hash.prototype['delete'] = hashDelete;\n Hash.prototype.get = hashGet;\n Hash.prototype.has = hashHas;\n Hash.prototype.set = hashSet;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates an list cache object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\n function ListCache(entries) {\n var index = -1,\n length = entries == null ? 0 : entries.length;\n\n this.clear();\n while (++index < length) {\n var entry = entries[index];\n this.set(entry[0], entry[1]);\n }\n }\n\n /**\n * Removes all key-value entries from the list cache.\n *\n * @private\n * @name clear\n * @memberOf ListCache\n */\n function listCacheClear() {\n this.__data__ = [];\n this.size = 0;\n }\n\n /**\n * Removes `key` and its value from the list cache.\n *\n * @private\n * @name delete\n * @memberOf ListCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\n function listCacheDelete(key) {\n var data = this.__data__,\n index = assocIndexOf(data, key);\n\n if (index < 0) {\n return false;\n }\n var lastIndex = data.length - 1;\n if (index == lastIndex) {\n data.pop();\n } else {\n splice.call(data, index, 1);\n }\n --this.size;\n return true;\n }\n\n /**\n * Gets the list cache value for `key`.\n *\n * @private\n * @name get\n * @memberOf ListCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\n function listCacheGet(key) {\n var data = this.__data__,\n index = assocIndexOf(data, key);\n\n return index < 0 ? undefined : data[index][1];\n }\n\n /**\n * Checks if a list cache value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf ListCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\n function listCacheHas(key) {\n return assocIndexOf(this.__data__, key) > -1;\n }\n\n /**\n * Sets the list cache `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf ListCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the list cache instance.\n */\n function listCacheSet(key, value) {\n var data = this.__data__,\n index = assocIndexOf(data, key);\n\n if (index < 0) {\n ++this.size;\n data.push([key, value]);\n } else {\n data[index][1] = value;\n }\n return this;\n }\n\n // Add methods to `ListCache`.\n ListCache.prototype.clear = listCacheClear;\n ListCache.prototype['delete'] = listCacheDelete;\n ListCache.prototype.get = listCacheGet;\n ListCache.prototype.has = listCacheHas;\n ListCache.prototype.set = listCacheSet;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates a map cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\n function MapCache(entries) {\n var index = -1,\n length = entries == null ? 0 : entries.length;\n\n this.clear();\n while (++index < length) {\n var entry = entries[index];\n this.set(entry[0], entry[1]);\n }\n }\n\n /**\n * Removes all key-value entries from the map.\n *\n * @private\n * @name clear\n * @memberOf MapCache\n */\n function mapCacheClear() {\n this.size = 0;\n this.__data__ = {\n 'hash': new Hash,\n 'map': new (Map || ListCache),\n 'string': new Hash\n };\n }\n\n /**\n * Removes `key` and its value from the map.\n *\n * @private\n * @name delete\n * @memberOf MapCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\n function mapCacheDelete(key) {\n var result = getMapData(this, key)['delete'](key);\n this.size -= result ? 1 : 0;\n return result;\n }\n\n /**\n * Gets the map value for `key`.\n *\n * @private\n * @name get\n * @memberOf MapCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\n function mapCacheGet(key) {\n return getMapData(this, key).get(key);\n }\n\n /**\n * Checks if a map value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf MapCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\n function mapCacheHas(key) {\n return getMapData(this, key).has(key);\n }\n\n /**\n * Sets the map `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf MapCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the map cache instance.\n */\n function mapCacheSet(key, value) {\n var data = getMapData(this, key),\n size = data.size;\n\n data.set(key, value);\n this.size += data.size == size ? 0 : 1;\n return this;\n }\n\n // Add methods to `MapCache`.\n MapCache.prototype.clear = mapCacheClear;\n MapCache.prototype['delete'] = mapCacheDelete;\n MapCache.prototype.get = mapCacheGet;\n MapCache.prototype.has = mapCacheHas;\n MapCache.prototype.set = mapCacheSet;\n\n /*------------------------------------------------------------------------*/\n\n /**\n *\n * Creates an array cache object to store unique values.\n *\n * @private\n * @constructor\n * @param {Array} [values] The values to cache.\n */\n function SetCache(values) {\n var index = -1,\n length = values == null ? 0 : values.length;\n\n this.__data__ = new MapCache;\n while (++index < length) {\n this.add(values[index]);\n }\n }\n\n /**\n * Adds `value` to the array cache.\n *\n * @private\n * @name add\n * @memberOf SetCache\n * @alias push\n * @param {*} value The value to cache.\n * @returns {Object} Returns the cache instance.\n */\n function setCacheAdd(value) {\n this.__data__.set(value, HASH_UNDEFINED);\n return this;\n }\n\n /**\n * Checks if `value` is in the array cache.\n *\n * @private\n * @name has\n * @memberOf SetCache\n * @param {*} value The value to search for.\n * @returns {number} Returns `true` if `value` is found, else `false`.\n */\n function setCacheHas(value) {\n return this.__data__.has(value);\n }\n\n // Add methods to `SetCache`.\n SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;\n SetCache.prototype.has = setCacheHas;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates a stack cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\n function Stack(entries) {\n var data = this.__data__ = new ListCache(entries);\n this.size = data.size;\n }\n\n /**\n * Removes all key-value entries from the stack.\n *\n * @private\n * @name clear\n * @memberOf Stack\n */\n function stackClear() {\n this.__data__ = new ListCache;\n this.size = 0;\n }\n\n /**\n * Removes `key` and its value from the stack.\n *\n * @private\n * @name delete\n * @memberOf Stack\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\n function stackDelete(key) {\n var data = this.__data__,\n result = data['delete'](key);\n\n this.size = data.size;\n return result;\n }\n\n /**\n * Gets the stack value for `key`.\n *\n * @private\n * @name get\n * @memberOf Stack\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\n function stackGet(key) {\n return this.__data__.get(key);\n }\n\n /**\n * Checks if a stack value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Stack\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\n function stackHas(key) {\n return this.__data__.has(key);\n }\n\n /**\n * Sets the stack `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Stack\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the stack cache instance.\n */\n function stackSet(key, value) {\n var data = this.__data__;\n if (data instanceof ListCache) {\n var pairs = data.__data__;\n if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {\n pairs.push([key, value]);\n this.size = ++data.size;\n return this;\n }\n data = this.__data__ = new MapCache(pairs);\n }\n data.set(key, value);\n this.size = data.size;\n return this;\n }\n\n // Add methods to `Stack`.\n Stack.prototype.clear = stackClear;\n Stack.prototype['delete'] = stackDelete;\n Stack.prototype.get = stackGet;\n Stack.prototype.has = stackHas;\n Stack.prototype.set = stackSet;\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates an array of the enumerable property names of the array-like `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @param {boolean} inherited Specify returning inherited property names.\n * @returns {Array} Returns the array of property names.\n */\n function arrayLikeKeys(value, inherited) {\n var isArr = isArray(value),\n isArg = !isArr && isArguments(value),\n isBuff = !isArr && !isArg && isBuffer(value),\n isType = !isArr && !isArg && !isBuff && isTypedArray(value),\n skipIndexes = isArr || isArg || isBuff || isType,\n result = skipIndexes ? baseTimes(value.length, String) : [],\n length = result.length;\n\n for (var key in value) {\n if ((inherited || hasOwnProperty.call(value, key)) &&\n !(skipIndexes && (\n // Safari 9 has enumerable `arguments.length` in strict mode.\n key == 'length' ||\n // Node.js 0.10 has enumerable non-index properties on buffers.\n (isBuff && (key == 'offset' || key == 'parent')) ||\n // PhantomJS 2 has enumerable non-index properties on typed arrays.\n (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||\n // Skip index properties.\n isIndex(key, length)\n ))) {\n result.push(key);\n }\n }\n return result;\n }\n\n /**\n * A specialized version of `_.sample` for arrays.\n *\n * @private\n * @param {Array} array The array to sample.\n * @returns {*} Returns the random element.\n */\n function arraySample(array) {\n var length = array.length;\n return length ? array[baseRandom(0, length - 1)] : undefined;\n }\n\n /**\n * A specialized version of `_.sampleSize` for arrays.\n *\n * @private\n * @param {Array} array The array to sample.\n * @param {number} n The number of elements to sample.\n * @returns {Array} Returns the random elements.\n */\n function arraySampleSize(array, n) {\n return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));\n }\n\n /**\n * A specialized version of `_.shuffle` for arrays.\n *\n * @private\n * @param {Array} array The array to shuffle.\n * @returns {Array} Returns the new shuffled array.\n */\n function arrayShuffle(array) {\n return shuffleSelf(copyArray(array));\n }\n\n /**\n * This function is like `assignValue` except that it doesn't assign\n * `undefined` values.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\n function assignMergeValue(object, key, value) {\n if ((value !== undefined && !eq(object[key], value)) ||\n (value === undefined && !(key in object))) {\n baseAssignValue(object, key, value);\n }\n }\n\n /**\n * Assigns `value` to `key` of `object` if the existing value is not equivalent\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\n function assignValue(object, key, value) {\n var objValue = object[key];\n if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||\n (value === undefined && !(key in object))) {\n baseAssignValue(object, key, value);\n }\n }\n\n /**\n * Gets the index at which the `key` is found in `array` of key-value pairs.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} key The key to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\n function assocIndexOf(array, key) {\n var length = array.length;\n while (length--) {\n if (eq(array[length][0], key)) {\n return length;\n }\n }\n return -1;\n }\n\n /**\n * Aggregates elements of `collection` on `accumulator` with keys transformed\n * by `iteratee` and values set by `setter`.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} setter The function to set `accumulator` values.\n * @param {Function} iteratee The iteratee to transform keys.\n * @param {Object} accumulator The initial aggregated object.\n * @returns {Function} Returns `accumulator`.\n */\n function baseAggregator(collection, setter, iteratee, accumulator) {\n baseEach(collection, function(value, key, collection) {\n setter(accumulator, value, iteratee(value), collection);\n });\n return accumulator;\n }\n\n /**\n * The base implementation of `_.assign` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\n function baseAssign(object, source) {\n return object && copyObject(source, keys(source), object);\n }\n\n /**\n * The base implementation of `_.assignIn` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\n function baseAssignIn(object, source) {\n return object && copyObject(source, keysIn(source), object);\n }\n\n /**\n * The base implementation of `assignValue` and `assignMergeValue` without\n * value checks.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\n function baseAssignValue(object, key, value) {\n if (key == '__proto__' && defineProperty) {\n defineProperty(object, key, {\n 'configurable': true,\n 'enumerable': true,\n 'value': value,\n 'writable': true\n });\n } else {\n object[key] = value;\n }\n }\n\n /**\n * The base implementation of `_.at` without support for individual paths.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {string[]} paths The property paths to pick.\n * @returns {Array} Returns the picked elements.\n */\n function baseAt(object, paths) {\n var index = -1,\n length = paths.length,\n result = Array(length),\n skip = object == null;\n\n while (++index < length) {\n result[index] = skip ? undefined : get(object, paths[index]);\n }\n return result;\n }\n\n /**\n * The base implementation of `_.clamp` which doesn't coerce arguments.\n *\n * @private\n * @param {number} number The number to clamp.\n * @param {number} [lower] The lower bound.\n * @param {number} upper The upper bound.\n * @returns {number} Returns the clamped number.\n */\n function baseClamp(number, lower, upper) {\n if (number === number) {\n if (upper !== undefined) {\n number = number <= upper ? number : upper;\n }\n if (lower !== undefined) {\n number = number >= lower ? number : lower;\n }\n }\n return number;\n }\n\n /**\n * The base implementation of `_.clone` and `_.cloneDeep` which tracks\n * traversed objects.\n *\n * @private\n * @param {*} value The value to clone.\n * @param {boolean} bitmask The bitmask flags.\n * 1 - Deep clone\n * 2 - Flatten inherited properties\n * 4 - Clone symbols\n * @param {Function} [customizer] The function to customize cloning.\n * @param {string} [key] The key of `value`.\n * @param {Object} [object] The parent object of `value`.\n * @param {Object} [stack] Tracks traversed objects and their clone counterparts.\n * @returns {*} Returns the cloned value.\n */\n function baseClone(value, bitmask, customizer, key, object, stack) {\n var result,\n isDeep = bitmask & CLONE_DEEP_FLAG,\n isFlat = bitmask & CLONE_FLAT_FLAG,\n isFull = bitmask & CLONE_SYMBOLS_FLAG;\n\n if (customizer) {\n result = object ? customizer(value, key, object, stack) : customizer(value);\n }\n if (result !== undefined) {\n return result;\n }\n if (!isObject(value)) {\n return value;\n }\n var isArr = isArray(value);\n if (isArr) {\n result = initCloneArray(value);\n if (!isDeep) {\n return copyArray(value, result);\n }\n } else {\n var tag = getTag(value),\n isFunc = tag == funcTag || tag == genTag;\n\n if (isBuffer(value)) {\n return cloneBuffer(value, isDeep);\n }\n if (tag == objectTag || tag == argsTag || (isFunc && !object)) {\n result = (isFlat || isFunc) ? {} : initCloneObject(value);\n if (!isDeep) {\n return isFlat\n ? copySymbolsIn(value, baseAssignIn(result, value))\n : copySymbols(value, baseAssign(result, value));\n }\n } else {\n if (!cloneableTags[tag]) {\n return object ? value : {};\n }\n result = initCloneByTag(value, tag, isDeep);\n }\n }\n // Check for circular references and return its corresponding clone.\n stack || (stack = new Stack);\n var stacked = stack.get(value);\n if (stacked) {\n return stacked;\n }\n stack.set(value, result);\n\n if (isSet(value)) {\n value.forEach(function(subValue) {\n result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));\n });\n } else if (isMap(value)) {\n value.forEach(function(subValue, key) {\n result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));\n });\n }\n\n var keysFunc = isFull\n ? (isFlat ? getAllKeysIn : getAllKeys)\n : (isFlat ? keysIn : keys);\n\n var props = isArr ? undefined : keysFunc(value);\n arrayEach(props || value, function(subValue, key) {\n if (props) {\n key = subValue;\n subValue = value[key];\n }\n // Recursively populate clone (susceptible to call stack limits).\n assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));\n });\n return result;\n }\n\n /**\n * The base implementation of `_.conforms` which doesn't clone `source`.\n *\n * @private\n * @param {Object} source The object of property predicates to conform to.\n * @returns {Function} Returns the new spec function.\n */\n function baseConforms(source) {\n var props = keys(source);\n return function(object) {\n return baseConformsTo(object, source, props);\n };\n }\n\n /**\n * The base implementation of `_.conformsTo` which accepts `props` to check.\n *\n * @private\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property predicates to conform to.\n * @returns {boolean} Returns `true` if `object` conforms, else `false`.\n */\n function baseConformsTo(object, source, props) {\n var length = props.length;\n if (object == null) {\n return !length;\n }\n object = Object(object);\n while (length--) {\n var key = props[length],\n predicate = source[key],\n value = object[key];\n\n if ((value === undefined && !(key in object)) || !predicate(value)) {\n return false;\n }\n }\n return true;\n }\n\n /**\n * The base implementation of `_.delay` and `_.defer` which accepts `args`\n * to provide to `func`.\n *\n * @private\n * @param {Function} func The function to delay.\n * @param {number} wait The number of milliseconds to delay invocation.\n * @param {Array} args The arguments to provide to `func`.\n * @returns {number|Object} Returns the timer id or timeout object.\n */\n function baseDelay(func, wait, args) {\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n return setTimeout(function() { func.apply(undefined, args); }, wait);\n }\n\n /**\n * The base implementation of methods like `_.difference` without support\n * for excluding multiple arrays or iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Array} values The values to exclude.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n */\n function baseDifference(array, values, iteratee, comparator) {\n var index = -1,\n includes = arrayIncludes,\n isCommon = true,\n length = array.length,\n result = [],\n valuesLength = values.length;\n\n if (!length) {\n return result;\n }\n if (iteratee) {\n values = arrayMap(values, baseUnary(iteratee));\n }\n if (comparator) {\n includes = arrayIncludesWith;\n isCommon = false;\n }\n else if (values.length >= LARGE_ARRAY_SIZE) {\n includes = cacheHas;\n isCommon = false;\n values = new SetCache(values);\n }\n outer:\n while (++index < length) {\n var value = array[index],\n computed = iteratee == null ? value : iteratee(value);\n\n value = (comparator || value !== 0) ? value : 0;\n if (isCommon && computed === computed) {\n var valuesIndex = valuesLength;\n while (valuesIndex--) {\n if (values[valuesIndex] === computed) {\n continue outer;\n }\n }\n result.push(value);\n }\n else if (!includes(values, computed, comparator)) {\n result.push(value);\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.forEach` without support for iteratee shorthands.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array|Object} Returns `collection`.\n */\n var baseEach = createBaseEach(baseForOwn);\n\n /**\n * The base implementation of `_.forEachRight` without support for iteratee shorthands.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array|Object} Returns `collection`.\n */\n var baseEachRight = createBaseEach(baseForOwnRight, true);\n\n /**\n * The base implementation of `_.every` without support for iteratee shorthands.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if all elements pass the predicate check,\n * else `false`\n */\n function baseEvery(collection, predicate) {\n var result = true;\n baseEach(collection, function(value, index, collection) {\n result = !!predicate(value, index, collection);\n return result;\n });\n return result;\n }\n\n /**\n * The base implementation of methods like `_.max` and `_.min` which accepts a\n * `comparator` to determine the extremum value.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} iteratee The iteratee invoked per iteration.\n * @param {Function} comparator The comparator used to compare values.\n * @returns {*} Returns the extremum value.\n */\n function baseExtremum(array, iteratee, comparator) {\n var index = -1,\n length = array.length;\n\n while (++index < length) {\n var value = array[index],\n current = iteratee(value);\n\n if (current != null && (computed === undefined\n ? (current === current && !isSymbol(current))\n : comparator(current, computed)\n )) {\n var computed = current,\n result = value;\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.fill` without an iteratee call guard.\n *\n * @private\n * @param {Array} array The array to fill.\n * @param {*} value The value to fill `array` with.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns `array`.\n */\n function baseFill(array, value, start, end) {\n var length = array.length;\n\n start = toInteger(start);\n if (start < 0) {\n start = -start > length ? 0 : (length + start);\n }\n end = (end === undefined || end > length) ? length : toInteger(end);\n if (end < 0) {\n end += length;\n }\n end = start > end ? 0 : toLength(end);\n while (start < end) {\n array[start++] = value;\n }\n return array;\n }\n\n /**\n * The base implementation of `_.filter` without support for iteratee shorthands.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n */\n function baseFilter(collection, predicate) {\n var result = [];\n baseEach(collection, function(value, index, collection) {\n if (predicate(value, index, collection)) {\n result.push(value);\n }\n });\n return result;\n }\n\n /**\n * The base implementation of `_.flatten` with support for restricting flattening.\n *\n * @private\n * @param {Array} array The array to flatten.\n * @param {number} depth The maximum recursion depth.\n * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.\n * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.\n * @param {Array} [result=[]] The initial result value.\n * @returns {Array} Returns the new flattened array.\n */\n function baseFlatten(array, depth, predicate, isStrict, result) {\n var index = -1,\n length = array.length;\n\n predicate || (predicate = isFlattenable);\n result || (result = []);\n\n while (++index < length) {\n var value = array[index];\n if (depth > 0 && predicate(value)) {\n if (depth > 1) {\n // Recursively flatten arrays (susceptible to call stack limits).\n baseFlatten(value, depth - 1, predicate, isStrict, result);\n } else {\n arrayPush(result, value);\n }\n } else if (!isStrict) {\n result[result.length] = value;\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `baseForOwn` which iterates over `object`\n * properties returned by `keysFunc` and invokes `iteratee` for each property.\n * Iteratee functions may exit iteration early by explicitly returning `false`.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @returns {Object} Returns `object`.\n */\n var baseFor = createBaseFor();\n\n /**\n * This function is like `baseFor` except that it iterates over properties\n * in the opposite order.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @returns {Object} Returns `object`.\n */\n var baseForRight = createBaseFor(true);\n\n /**\n * The base implementation of `_.forOwn` without support for iteratee shorthands.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Object} Returns `object`.\n */\n function baseForOwn(object, iteratee) {\n return object && baseFor(object, iteratee, keys);\n }\n\n /**\n * The base implementation of `_.forOwnRight` without support for iteratee shorthands.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Object} Returns `object`.\n */\n function baseForOwnRight(object, iteratee) {\n return object && baseForRight(object, iteratee, keys);\n }\n\n /**\n * The base implementation of `_.functions` which creates an array of\n * `object` function property names filtered from `props`.\n *\n * @private\n * @param {Object} object The object to inspect.\n * @param {Array} props The property names to filter.\n * @returns {Array} Returns the function names.\n */\n function baseFunctions(object, props) {\n return arrayFilter(props, function(key) {\n return isFunction(object[key]);\n });\n }\n\n /**\n * The base implementation of `_.get` without support for default values.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @returns {*} Returns the resolved value.\n */\n function baseGet(object, path) {\n path = castPath(path, object);\n\n var index = 0,\n length = path.length;\n\n while (object != null && index < length) {\n object = object[toKey(path[index++])];\n }\n return (index && index == length) ? object : undefined;\n }\n\n /**\n * The base implementation of `getAllKeys` and `getAllKeysIn` which uses\n * `keysFunc` and `symbolsFunc` to get the enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @param {Function} symbolsFunc The function to get the symbols of `object`.\n * @returns {Array} Returns the array of property names and symbols.\n */\n function baseGetAllKeys(object, keysFunc, symbolsFunc) {\n var result = keysFunc(object);\n return isArray(object) ? result : arrayPush(result, symbolsFunc(object));\n }\n\n /**\n * The base implementation of `getTag` without fallbacks for buggy environments.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\n function baseGetTag(value) {\n if (value == null) {\n return value === undefined ? undefinedTag : nullTag;\n }\n return (symToStringTag && symToStringTag in Object(value))\n ? getRawTag(value)\n : objectToString(value);\n }\n\n /**\n * The base implementation of `_.gt` which doesn't coerce arguments.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is greater than `other`,\n * else `false`.\n */\n function baseGt(value, other) {\n return value > other;\n }\n\n /**\n * The base implementation of `_.has` without support for deep paths.\n *\n * @private\n * @param {Object} [object] The object to query.\n * @param {Array|string} key The key to check.\n * @returns {boolean} Returns `true` if `key` exists, else `false`.\n */\n function baseHas(object, key) {\n return object != null && hasOwnProperty.call(object, key);\n }\n\n /**\n * The base implementation of `_.hasIn` without support for deep paths.\n *\n * @private\n * @param {Object} [object] The object to query.\n * @param {Array|string} key The key to check.\n * @returns {boolean} Returns `true` if `key` exists, else `false`.\n */\n function baseHasIn(object, key) {\n return object != null && key in Object(object);\n }\n\n /**\n * The base implementation of `_.inRange` which doesn't coerce arguments.\n *\n * @private\n * @param {number} number The number to check.\n * @param {number} start The start of the range.\n * @param {number} end The end of the range.\n * @returns {boolean} Returns `true` if `number` is in the range, else `false`.\n */\n function baseInRange(number, start, end) {\n return number >= nativeMin(start, end) && number < nativeMax(start, end);\n }\n\n /**\n * The base implementation of methods like `_.intersection`, without support\n * for iteratee shorthands, that accepts an array of arrays to inspect.\n *\n * @private\n * @param {Array} arrays The arrays to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of shared values.\n */\n function baseIntersection(arrays, iteratee, comparator) {\n var includes = comparator ? arrayIncludesWith : arrayIncludes,\n length = arrays[0].length,\n othLength = arrays.length,\n othIndex = othLength,\n caches = Array(othLength),\n maxLength = Infinity,\n result = [];\n\n while (othIndex--) {\n var array = arrays[othIndex];\n if (othIndex && iteratee) {\n array = arrayMap(array, baseUnary(iteratee));\n }\n maxLength = nativeMin(array.length, maxLength);\n caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))\n ? new SetCache(othIndex && array)\n : undefined;\n }\n array = arrays[0];\n\n var index = -1,\n seen = caches[0];\n\n outer:\n while (++index < length && result.length < maxLength) {\n var value = array[index],\n computed = iteratee ? iteratee(value) : value;\n\n value = (comparator || value !== 0) ? value : 0;\n if (!(seen\n ? cacheHas(seen, computed)\n : includes(result, computed, comparator)\n )) {\n othIndex = othLength;\n while (--othIndex) {\n var cache = caches[othIndex];\n if (!(cache\n ? cacheHas(cache, computed)\n : includes(arrays[othIndex], computed, comparator))\n ) {\n continue outer;\n }\n }\n if (seen) {\n seen.push(computed);\n }\n result.push(value);\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.invert` and `_.invertBy` which inverts\n * `object` with values transformed by `iteratee` and set by `setter`.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {Function} setter The function to set `accumulator` values.\n * @param {Function} iteratee The iteratee to transform values.\n * @param {Object} accumulator The initial inverted object.\n * @returns {Function} Returns `accumulator`.\n */\n function baseInverter(object, setter, iteratee, accumulator) {\n baseForOwn(object, function(value, key, object) {\n setter(accumulator, iteratee(value), key, object);\n });\n return accumulator;\n }\n\n /**\n * The base implementation of `_.invoke` without support for individual\n * method arguments.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the method to invoke.\n * @param {Array} args The arguments to invoke the method with.\n * @returns {*} Returns the result of the invoked method.\n */\n function baseInvoke(object, path, args) {\n path = castPath(path, object);\n object = parent(object, path);\n var func = object == null ? object : object[toKey(last(path))];\n return func == null ? undefined : apply(func, object, args);\n }\n\n /**\n * The base implementation of `_.isArguments`.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n */\n function baseIsArguments(value) {\n return isObjectLike(value) && baseGetTag(value) == argsTag;\n }\n\n /**\n * The base implementation of `_.isArrayBuffer` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.\n */\n function baseIsArrayBuffer(value) {\n return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;\n }\n\n /**\n * The base implementation of `_.isDate` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a date object, else `false`.\n */\n function baseIsDate(value) {\n return isObjectLike(value) && baseGetTag(value) == dateTag;\n }\n\n /**\n * The base implementation of `_.isEqual` which supports partial comparisons\n * and tracks traversed objects.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {boolean} bitmask The bitmask flags.\n * 1 - Unordered comparison\n * 2 - Partial comparison\n * @param {Function} [customizer] The function to customize comparisons.\n * @param {Object} [stack] Tracks traversed `value` and `other` objects.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n */\n function baseIsEqual(value, other, bitmask, customizer, stack) {\n if (value === other) {\n return true;\n }\n if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {\n return value !== value && other !== other;\n }\n return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);\n }\n\n /**\n * A specialized version of `baseIsEqual` for arrays and objects which performs\n * deep comparisons and tracks traversed objects enabling objects with circular\n * references to be compared.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} [stack] Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\n function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {\n var objIsArr = isArray(object),\n othIsArr = isArray(other),\n objTag = objIsArr ? arrayTag : getTag(object),\n othTag = othIsArr ? arrayTag : getTag(other);\n\n objTag = objTag == argsTag ? objectTag : objTag;\n othTag = othTag == argsTag ? objectTag : othTag;\n\n var objIsObj = objTag == objectTag,\n othIsObj = othTag == objectTag,\n isSameTag = objTag == othTag;\n\n if (isSameTag && isBuffer(object)) {\n if (!isBuffer(other)) {\n return false;\n }\n objIsArr = true;\n objIsObj = false;\n }\n if (isSameTag && !objIsObj) {\n stack || (stack = new Stack);\n return (objIsArr || isTypedArray(object))\n ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)\n : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);\n }\n if (!(bitmask & COMPARE_PARTIAL_FLAG)) {\n var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),\n othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');\n\n if (objIsWrapped || othIsWrapped) {\n var objUnwrapped = objIsWrapped ? object.value() : object,\n othUnwrapped = othIsWrapped ? other.value() : other;\n\n stack || (stack = new Stack);\n return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);\n }\n }\n if (!isSameTag) {\n return false;\n }\n stack || (stack = new Stack);\n return equalObjects(object, other, bitmask, customizer, equalFunc, stack);\n }\n\n /**\n * The base implementation of `_.isMap` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n */\n function baseIsMap(value) {\n return isObjectLike(value) && getTag(value) == mapTag;\n }\n\n /**\n * The base implementation of `_.isMatch` without support for iteratee shorthands.\n *\n * @private\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property values to match.\n * @param {Array} matchData The property names, values, and compare flags to match.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if `object` is a match, else `false`.\n */\n function baseIsMatch(object, source, matchData, customizer) {\n var index = matchData.length,\n length = index,\n noCustomizer = !customizer;\n\n if (object == null) {\n return !length;\n }\n object = Object(object);\n while (index--) {\n var data = matchData[index];\n if ((noCustomizer && data[2])\n ? data[1] !== object[data[0]]\n : !(data[0] in object)\n ) {\n return false;\n }\n }\n while (++index < length) {\n data = matchData[index];\n var key = data[0],\n objValue = object[key],\n srcValue = data[1];\n\n if (noCustomizer && data[2]) {\n if (objValue === undefined && !(key in object)) {\n return false;\n }\n } else {\n var stack = new Stack;\n if (customizer) {\n var result = customizer(objValue, srcValue, key, object, source, stack);\n }\n if (!(result === undefined\n ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)\n : result\n )) {\n return false;\n }\n }\n }\n return true;\n }\n\n /**\n * The base implementation of `_.isNative` without bad shim checks.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n * else `false`.\n */\n function baseIsNative(value) {\n if (!isObject(value) || isMasked(value)) {\n return false;\n }\n var pattern = isFunction(value) ? reIsNative : reIsHostCtor;\n return pattern.test(toSource(value));\n }\n\n /**\n * The base implementation of `_.isRegExp` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.\n */\n function baseIsRegExp(value) {\n return isObjectLike(value) && baseGetTag(value) == regexpTag;\n }\n\n /**\n * The base implementation of `_.isSet` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n */\n function baseIsSet(value) {\n return isObjectLike(value) && getTag(value) == setTag;\n }\n\n /**\n * The base implementation of `_.isTypedArray` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n */\n function baseIsTypedArray(value) {\n return isObjectLike(value) &&\n isLength(value.length) && !!typedArrayTags[baseGetTag(value)];\n }\n\n /**\n * The base implementation of `_.iteratee`.\n *\n * @private\n * @param {*} [value=_.identity] The value to convert to an iteratee.\n * @returns {Function} Returns the iteratee.\n */\n function baseIteratee(value) {\n // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.\n // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.\n if (typeof value == 'function') {\n return value;\n }\n if (value == null) {\n return identity;\n }\n if (typeof value == 'object') {\n return isArray(value)\n ? baseMatchesProperty(value[0], value[1])\n : baseMatches(value);\n }\n return property(value);\n }\n\n /**\n * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\n function baseKeys(object) {\n if (!isPrototype(object)) {\n return nativeKeys(object);\n }\n var result = [];\n for (var key in Object(object)) {\n if (hasOwnProperty.call(object, key) && key != 'constructor') {\n result.push(key);\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\n function baseKeysIn(object) {\n if (!isObject(object)) {\n return nativeKeysIn(object);\n }\n var isProto = isPrototype(object),\n result = [];\n\n for (var key in object) {\n if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {\n result.push(key);\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.lt` which doesn't coerce arguments.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is less than `other`,\n * else `false`.\n */\n function baseLt(value, other) {\n return value < other;\n }\n\n /**\n * The base implementation of `_.map` without support for iteratee shorthands.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the new mapped array.\n */\n function baseMap(collection, iteratee) {\n var index = -1,\n result = isArrayLike(collection) ? Array(collection.length) : [];\n\n baseEach(collection, function(value, key, collection) {\n result[++index] = iteratee(value, key, collection);\n });\n return result;\n }\n\n /**\n * The base implementation of `_.matches` which doesn't clone `source`.\n *\n * @private\n * @param {Object} source The object of property values to match.\n * @returns {Function} Returns the new spec function.\n */\n function baseMatches(source) {\n var matchData = getMatchData(source);\n if (matchData.length == 1 && matchData[0][2]) {\n return matchesStrictComparable(matchData[0][0], matchData[0][1]);\n }\n return function(object) {\n return object === source || baseIsMatch(object, source, matchData);\n };\n }\n\n /**\n * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.\n *\n * @private\n * @param {string} path The path of the property to get.\n * @param {*} srcValue The value to match.\n * @returns {Function} Returns the new spec function.\n */\n function baseMatchesProperty(path, srcValue) {\n if (isKey(path) && isStrictComparable(srcValue)) {\n return matchesStrictComparable(toKey(path), srcValue);\n }\n return function(object) {\n var objValue = get(object, path);\n return (objValue === undefined && objValue === srcValue)\n ? hasIn(object, path)\n : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);\n };\n }\n\n /**\n * The base implementation of `_.merge` without support for multiple sources.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @param {number} srcIndex The index of `source`.\n * @param {Function} [customizer] The function to customize merged values.\n * @param {Object} [stack] Tracks traversed source values and their merged\n * counterparts.\n */\n function baseMerge(object, source, srcIndex, customizer, stack) {\n if (object === source) {\n return;\n }\n baseFor(source, function(srcValue, key) {\n stack || (stack = new Stack);\n if (isObject(srcValue)) {\n baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);\n }\n else {\n var newValue = customizer\n ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)\n : undefined;\n\n if (newValue === undefined) {\n newValue = srcValue;\n }\n assignMergeValue(object, key, newValue);\n }\n }, keysIn);\n }\n\n /**\n * A specialized version of `baseMerge` for arrays and objects which performs\n * deep merges and tracks traversed objects enabling objects with circular\n * references to be merged.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @param {string} key The key of the value to merge.\n * @param {number} srcIndex The index of `source`.\n * @param {Function} mergeFunc The function to merge values.\n * @param {Function} [customizer] The function to customize assigned values.\n * @param {Object} [stack] Tracks traversed source values and their merged\n * counterparts.\n */\n function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {\n var objValue = safeGet(object, key),\n srcValue = safeGet(source, key),\n stacked = stack.get(srcValue);\n\n if (stacked) {\n assignMergeValue(object, key, stacked);\n return;\n }\n var newValue = customizer\n ? customizer(objValue, srcValue, (key + ''), object, source, stack)\n : undefined;\n\n var isCommon = newValue === undefined;\n\n if (isCommon) {\n var isArr = isArray(srcValue),\n isBuff = !isArr && isBuffer(srcValue),\n isTyped = !isArr && !isBuff && isTypedArray(srcValue);\n\n newValue = srcValue;\n if (isArr || isBuff || isTyped) {\n if (isArray(objValue)) {\n newValue = objValue;\n }\n else if (isArrayLikeObject(objValue)) {\n newValue = copyArray(objValue);\n }\n else if (isBuff) {\n isCommon = false;\n newValue = cloneBuffer(srcValue, true);\n }\n else if (isTyped) {\n isCommon = false;\n newValue = cloneTypedArray(srcValue, true);\n }\n else {\n newValue = [];\n }\n }\n else if (isPlainObject(srcValue) || isArguments(srcValue)) {\n newValue = objValue;\n if (isArguments(objValue)) {\n newValue = toPlainObject(objValue);\n }\n else if (!isObject(objValue) || isFunction(objValue)) {\n newValue = initCloneObject(srcValue);\n }\n }\n else {\n isCommon = false;\n }\n }\n if (isCommon) {\n // Recursively merge objects and arrays (susceptible to call stack limits).\n stack.set(srcValue, newValue);\n mergeFunc(newValue, srcValue, srcIndex, customizer, stack);\n stack['delete'](srcValue);\n }\n assignMergeValue(object, key, newValue);\n }\n\n /**\n * The base implementation of `_.nth` which doesn't coerce arguments.\n *\n * @private\n * @param {Array} array The array to query.\n * @param {number} n The index of the element to return.\n * @returns {*} Returns the nth element of `array`.\n */\n function baseNth(array, n) {\n var length = array.length;\n if (!length) {\n return;\n }\n n += n < 0 ? length : 0;\n return isIndex(n, length) ? array[n] : undefined;\n }\n\n /**\n * The base implementation of `_.orderBy` without param guards.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.\n * @param {string[]} orders The sort orders of `iteratees`.\n * @returns {Array} Returns the new sorted array.\n */\n function baseOrderBy(collection, iteratees, orders) {\n if (iteratees.length) {\n iteratees = arrayMap(iteratees, function(iteratee) {\n if (isArray(iteratee)) {\n return function(value) {\n return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);\n }\n }\n return iteratee;\n });\n } else {\n iteratees = [identity];\n }\n\n var index = -1;\n iteratees = arrayMap(iteratees, baseUnary(getIteratee()));\n\n var result = baseMap(collection, function(value, key, collection) {\n var criteria = arrayMap(iteratees, function(iteratee) {\n return iteratee(value);\n });\n return { 'criteria': criteria, 'index': ++index, 'value': value };\n });\n\n return baseSortBy(result, function(object, other) {\n return compareMultiple(object, other, orders);\n });\n }\n\n /**\n * The base implementation of `_.pick` without support for individual\n * property identifiers.\n *\n * @private\n * @param {Object} object The source object.\n * @param {string[]} paths The property paths to pick.\n * @returns {Object} Returns the new object.\n */\n function basePick(object, paths) {\n return basePickBy(object, paths, function(value, path) {\n return hasIn(object, path);\n });\n }\n\n /**\n * The base implementation of `_.pickBy` without support for iteratee shorthands.\n *\n * @private\n * @param {Object} object The source object.\n * @param {string[]} paths The property paths to pick.\n * @param {Function} predicate The function invoked per property.\n * @returns {Object} Returns the new object.\n */\n function basePickBy(object, paths, predicate) {\n var index = -1,\n length = paths.length,\n result = {};\n\n while (++index < length) {\n var path = paths[index],\n value = baseGet(object, path);\n\n if (predicate(value, path)) {\n baseSet(result, castPath(path, object), value);\n }\n }\n return result;\n }\n\n /**\n * A specialized version of `baseProperty` which supports deep paths.\n *\n * @private\n * @param {Array|string} path The path of the property to get.\n * @returns {Function} Returns the new accessor function.\n */\n function basePropertyDeep(path) {\n return function(object) {\n return baseGet(object, path);\n };\n }\n\n /**\n * The base implementation of `_.pullAllBy` without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns `array`.\n */\n function basePullAll(array, values, iteratee, comparator) {\n var indexOf = comparator ? baseIndexOfWith : baseIndexOf,\n index = -1,\n length = values.length,\n seen = array;\n\n if (array === values) {\n values = copyArray(values);\n }\n if (iteratee) {\n seen = arrayMap(array, baseUnary(iteratee));\n }\n while (++index < length) {\n var fromIndex = 0,\n value = values[index],\n computed = iteratee ? iteratee(value) : value;\n\n while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {\n if (seen !== array) {\n splice.call(seen, fromIndex, 1);\n }\n splice.call(array, fromIndex, 1);\n }\n }\n return array;\n }\n\n /**\n * The base implementation of `_.pullAt` without support for individual\n * indexes or capturing the removed elements.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {number[]} indexes The indexes of elements to remove.\n * @returns {Array} Returns `array`.\n */\n function basePullAt(array, indexes) {\n var length = array ? indexes.length : 0,\n lastIndex = length - 1;\n\n while (length--) {\n var index = indexes[length];\n if (length == lastIndex || index !== previous) {\n var previous = index;\n if (isIndex(index)) {\n splice.call(array, index, 1);\n } else {\n baseUnset(array, index);\n }\n }\n }\n return array;\n }\n\n /**\n * The base implementation of `_.random` without support for returning\n * floating-point numbers.\n *\n * @private\n * @param {number} lower The lower bound.\n * @param {number} upper The upper bound.\n * @returns {number} Returns the random number.\n */\n function baseRandom(lower, upper) {\n return lower + nativeFloor(nativeRandom() * (upper - lower + 1));\n }\n\n /**\n * The base implementation of `_.range` and `_.rangeRight` which doesn't\n * coerce arguments.\n *\n * @private\n * @param {number} start The start of the range.\n * @param {number} end The end of the range.\n * @param {number} step The value to increment or decrement by.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Array} Returns the range of numbers.\n */\n function baseRange(start, end, step, fromRight) {\n var index = -1,\n length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),\n result = Array(length);\n\n while (length--) {\n result[fromRight ? length : ++index] = start;\n start += step;\n }\n return result;\n }\n\n /**\n * The base implementation of `_.repeat` which doesn't coerce arguments.\n *\n * @private\n * @param {string} string The string to repeat.\n * @param {number} n The number of times to repeat the string.\n * @returns {string} Returns the repeated string.\n */\n function baseRepeat(string, n) {\n var result = '';\n if (!string || n < 1 || n > MAX_SAFE_INTEGER) {\n return result;\n }\n // Leverage the exponentiation by squaring algorithm for a faster repeat.\n // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.\n do {\n if (n % 2) {\n result += string;\n }\n n = nativeFloor(n / 2);\n if (n) {\n string += string;\n }\n } while (n);\n\n return result;\n }\n\n /**\n * The base implementation of `_.rest` which doesn't validate or coerce arguments.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @returns {Function} Returns the new function.\n */\n function baseRest(func, start) {\n return setToString(overRest(func, start, identity), func + '');\n }\n\n /**\n * The base implementation of `_.sample`.\n *\n * @private\n * @param {Array|Object} collection The collection to sample.\n * @returns {*} Returns the random element.\n */\n function baseSample(collection) {\n return arraySample(values(collection));\n }\n\n /**\n * The base implementation of `_.sampleSize` without param guards.\n *\n * @private\n * @param {Array|Object} collection The collection to sample.\n * @param {number} n The number of elements to sample.\n * @returns {Array} Returns the random elements.\n */\n function baseSampleSize(collection, n) {\n var array = values(collection);\n return shuffleSelf(array, baseClamp(n, 0, array.length));\n }\n\n /**\n * The base implementation of `_.set`.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @param {Function} [customizer] The function to customize path creation.\n * @returns {Object} Returns `object`.\n */\n function baseSet(object, path, value, customizer) {\n if (!isObject(object)) {\n return object;\n }\n path = castPath(path, object);\n\n var index = -1,\n length = path.length,\n lastIndex = length - 1,\n nested = object;\n\n while (nested != null && ++index < length) {\n var key = toKey(path[index]),\n newValue = value;\n\n if (key === '__proto__' || key === 'constructor' || key === 'prototype') {\n return object;\n }\n\n if (index != lastIndex) {\n var objValue = nested[key];\n newValue = customizer ? customizer(objValue, key, nested) : undefined;\n if (newValue === undefined) {\n newValue = isObject(objValue)\n ? objValue\n : (isIndex(path[index + 1]) ? [] : {});\n }\n }\n assignValue(nested, key, newValue);\n nested = nested[key];\n }\n return object;\n }\n\n /**\n * The base implementation of `setData` without support for hot loop shorting.\n *\n * @private\n * @param {Function} func The function to associate metadata with.\n * @param {*} data The metadata.\n * @returns {Function} Returns `func`.\n */\n var baseSetData = !metaMap ? identity : function(func, data) {\n metaMap.set(func, data);\n return func;\n };\n\n /**\n * The base implementation of `setToString` without support for hot loop shorting.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\n var baseSetToString = !defineProperty ? identity : function(func, string) {\n return defineProperty(func, 'toString', {\n 'configurable': true,\n 'enumerable': false,\n 'value': constant(string),\n 'writable': true\n });\n };\n\n /**\n * The base implementation of `_.shuffle`.\n *\n * @private\n * @param {Array|Object} collection The collection to shuffle.\n * @returns {Array} Returns the new shuffled array.\n */\n function baseShuffle(collection) {\n return shuffleSelf(values(collection));\n }\n\n /**\n * The base implementation of `_.slice` without an iteratee call guard.\n *\n * @private\n * @param {Array} array The array to slice.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns the slice of `array`.\n */\n function baseSlice(array, start, end) {\n var index = -1,\n length = array.length;\n\n if (start < 0) {\n start = -start > length ? 0 : (length + start);\n }\n end = end > length ? length : end;\n if (end < 0) {\n end += length;\n }\n length = start > end ? 0 : ((end - start) >>> 0);\n start >>>= 0;\n\n var result = Array(length);\n while (++index < length) {\n result[index] = array[index + start];\n }\n return result;\n }\n\n /**\n * The base implementation of `_.some` without support for iteratee shorthands.\n *\n * @private\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n * else `false`.\n */\n function baseSome(collection, predicate) {\n var result;\n\n baseEach(collection, function(value, index, collection) {\n result = predicate(value, index, collection);\n return !result;\n });\n return !!result;\n }\n\n /**\n * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which\n * performs a binary search of `array` to determine the index at which `value`\n * should be inserted into `array` in order to maintain its sort order.\n *\n * @private\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {boolean} [retHighest] Specify returning the highest qualified index.\n * @returns {number} Returns the index at which `value` should be inserted\n * into `array`.\n */\n function baseSortedIndex(array, value, retHighest) {\n var low = 0,\n high = array == null ? low : array.length;\n\n if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {\n while (low < high) {\n var mid = (low + high) >>> 1,\n computed = array[mid];\n\n if (computed !== null && !isSymbol(computed) &&\n (retHighest ? (computed <= value) : (computed < value))) {\n low = mid + 1;\n } else {\n high = mid;\n }\n }\n return high;\n }\n return baseSortedIndexBy(array, value, identity, retHighest);\n }\n\n /**\n * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`\n * which invokes `iteratee` for `value` and each element of `array` to compute\n * their sort ranking. The iteratee is invoked with one argument; (value).\n *\n * @private\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {Function} iteratee The iteratee invoked per element.\n * @param {boolean} [retHighest] Specify returning the highest qualified index.\n * @returns {number} Returns the index at which `value` should be inserted\n * into `array`.\n */\n function baseSortedIndexBy(array, value, iteratee, retHighest) {\n var low = 0,\n high = array == null ? 0 : array.length;\n if (high === 0) {\n return 0;\n }\n\n value = iteratee(value);\n var valIsNaN = value !== value,\n valIsNull = value === null,\n valIsSymbol = isSymbol(value),\n valIsUndefined = value === undefined;\n\n while (low < high) {\n var mid = nativeFloor((low + high) / 2),\n computed = iteratee(array[mid]),\n othIsDefined = computed !== undefined,\n othIsNull = computed === null,\n othIsReflexive = computed === computed,\n othIsSymbol = isSymbol(computed);\n\n if (valIsNaN) {\n var setLow = retHighest || othIsReflexive;\n } else if (valIsUndefined) {\n setLow = othIsReflexive && (retHighest || othIsDefined);\n } else if (valIsNull) {\n setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);\n } else if (valIsSymbol) {\n setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);\n } else if (othIsNull || othIsSymbol) {\n setLow = false;\n } else {\n setLow = retHighest ? (computed <= value) : (computed < value);\n }\n if (setLow) {\n low = mid + 1;\n } else {\n high = mid;\n }\n }\n return nativeMin(high, MAX_ARRAY_INDEX);\n }\n\n /**\n * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without\n * support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n */\n function baseSortedUniq(array, iteratee) {\n var index = -1,\n length = array.length,\n resIndex = 0,\n result = [];\n\n while (++index < length) {\n var value = array[index],\n computed = iteratee ? iteratee(value) : value;\n\n if (!index || !eq(computed, seen)) {\n var seen = computed;\n result[resIndex++] = value === 0 ? 0 : value;\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.toNumber` which doesn't ensure correct\n * conversions of binary, hexadecimal, or octal string values.\n *\n * @private\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n */\n function baseToNumber(value) {\n if (typeof value == 'number') {\n return value;\n }\n if (isSymbol(value)) {\n return NAN;\n }\n return +value;\n }\n\n /**\n * The base implementation of `_.toString` which doesn't convert nullish\n * values to empty strings.\n *\n * @private\n * @param {*} value The value to process.\n * @returns {string} Returns the string.\n */\n function baseToString(value) {\n // Exit early for strings to avoid a performance hit in some environments.\n if (typeof value == 'string') {\n return value;\n }\n if (isArray(value)) {\n // Recursively convert values (susceptible to call stack limits).\n return arrayMap(value, baseToString) + '';\n }\n if (isSymbol(value)) {\n return symbolToString ? symbolToString.call(value) : '';\n }\n var result = (value + '');\n return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;\n }\n\n /**\n * The base implementation of `_.uniqBy` without support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n */\n function baseUniq(array, iteratee, comparator) {\n var index = -1,\n includes = arrayIncludes,\n length = array.length,\n isCommon = true,\n result = [],\n seen = result;\n\n if (comparator) {\n isCommon = false;\n includes = arrayIncludesWith;\n }\n else if (length >= LARGE_ARRAY_SIZE) {\n var set = iteratee ? null : createSet(array);\n if (set) {\n return setToArray(set);\n }\n isCommon = false;\n includes = cacheHas;\n seen = new SetCache;\n }\n else {\n seen = iteratee ? [] : result;\n }\n outer:\n while (++index < length) {\n var value = array[index],\n computed = iteratee ? iteratee(value) : value;\n\n value = (comparator || value !== 0) ? value : 0;\n if (isCommon && computed === computed) {\n var seenIndex = seen.length;\n while (seenIndex--) {\n if (seen[seenIndex] === computed) {\n continue outer;\n }\n }\n if (iteratee) {\n seen.push(computed);\n }\n result.push(value);\n }\n else if (!includes(seen, computed, comparator)) {\n if (seen !== result) {\n seen.push(computed);\n }\n result.push(value);\n }\n }\n return result;\n }\n\n /**\n * The base implementation of `_.unset`.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {Array|string} path The property path to unset.\n * @returns {boolean} Returns `true` if the property is deleted, else `false`.\n */\n function baseUnset(object, path) {\n path = castPath(path, object);\n object = parent(object, path);\n return object == null || delete object[toKey(last(path))];\n }\n\n /**\n * The base implementation of `_.update`.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to update.\n * @param {Function} updater The function to produce the updated value.\n * @param {Function} [customizer] The function to customize path creation.\n * @returns {Object} Returns `object`.\n */\n function baseUpdate(object, path, updater, customizer) {\n return baseSet(object, path, updater(baseGet(object, path)), customizer);\n }\n\n /**\n * The base implementation of methods like `_.dropWhile` and `_.takeWhile`\n * without support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to query.\n * @param {Function} predicate The function invoked per iteration.\n * @param {boolean} [isDrop] Specify dropping elements instead of taking them.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Array} Returns the slice of `array`.\n */\n function baseWhile(array, predicate, isDrop, fromRight) {\n var length = array.length,\n index = fromRight ? length : -1;\n\n while ((fromRight ? index-- : ++index < length) &&\n predicate(array[index], index, array)) {}\n\n return isDrop\n ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))\n : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));\n }\n\n /**\n * The base implementation of `wrapperValue` which returns the result of\n * performing a sequence of actions on the unwrapped `value`, where each\n * successive action is supplied the return value of the previous.\n *\n * @private\n * @param {*} value The unwrapped value.\n * @param {Array} actions Actions to perform to resolve the unwrapped value.\n * @returns {*} Returns the resolved value.\n */\n function baseWrapperValue(value, actions) {\n var result = value;\n if (result instanceof LazyWrapper) {\n result = result.value();\n }\n return arrayReduce(actions, function(result, action) {\n return action.func.apply(action.thisArg, arrayPush([result], action.args));\n }, result);\n }\n\n /**\n * The base implementation of methods like `_.xor`, without support for\n * iteratee shorthands, that accepts an array of arrays to inspect.\n *\n * @private\n * @param {Array} arrays The arrays to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of values.\n */\n function baseXor(arrays, iteratee, comparator) {\n var length = arrays.length;\n if (length < 2) {\n return length ? baseUniq(arrays[0]) : [];\n }\n var index = -1,\n result = Array(length);\n\n while (++index < length) {\n var array = arrays[index],\n othIndex = -1;\n\n while (++othIndex < length) {\n if (othIndex != index) {\n result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);\n }\n }\n }\n return baseUniq(baseFlatten(result, 1), iteratee, comparator);\n }\n\n /**\n * This base implementation of `_.zipObject` which assigns values using `assignFunc`.\n *\n * @private\n * @param {Array} props The property identifiers.\n * @param {Array} values The property values.\n * @param {Function} assignFunc The function to assign values.\n * @returns {Object} Returns the new object.\n */\n function baseZipObject(props, values, assignFunc) {\n var index = -1,\n length = props.length,\n valsLength = values.length,\n result = {};\n\n while (++index < length) {\n var value = index < valsLength ? values[index] : undefined;\n assignFunc(result, props[index], value);\n }\n return result;\n }\n\n /**\n * Casts `value` to an empty array if it's not an array like object.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {Array|Object} Returns the cast array-like object.\n */\n function castArrayLikeObject(value) {\n return isArrayLikeObject(value) ? value : [];\n }\n\n /**\n * Casts `value` to `identity` if it's not a function.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {Function} Returns cast function.\n */\n function castFunction(value) {\n return typeof value == 'function' ? value : identity;\n }\n\n /**\n * Casts `value` to a path array if it's not one.\n *\n * @private\n * @param {*} value The value to inspect.\n * @param {Object} [object] The object to query keys on.\n * @returns {Array} Returns the cast property path array.\n */\n function castPath(value, object) {\n if (isArray(value)) {\n return value;\n }\n return isKey(value, object) ? [value] : stringToPath(toString(value));\n }\n\n /**\n * A `baseRest` alias which can be replaced with `identity` by module\n * replacement plugins.\n *\n * @private\n * @type {Function}\n * @param {Function} func The function to apply a rest parameter to.\n * @returns {Function} Returns the new function.\n */\n var castRest = baseRest;\n\n /**\n * Casts `array` to a slice if it's needed.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {number} start The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns the cast slice.\n */\n function castSlice(array, start, end) {\n var length = array.length;\n end = end === undefined ? length : end;\n return (!start && end >= length) ? array : baseSlice(array, start, end);\n }\n\n /**\n * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).\n *\n * @private\n * @param {number|Object} id The timer id or timeout object of the timer to clear.\n */\n var clearTimeout = ctxClearTimeout || function(id) {\n return root.clearTimeout(id);\n };\n\n /**\n * Creates a clone of `buffer`.\n *\n * @private\n * @param {Buffer} buffer The buffer to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Buffer} Returns the cloned buffer.\n */\n function cloneBuffer(buffer, isDeep) {\n if (isDeep) {\n return buffer.slice();\n }\n var length = buffer.length,\n result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);\n\n buffer.copy(result);\n return result;\n }\n\n /**\n * Creates a clone of `arrayBuffer`.\n *\n * @private\n * @param {ArrayBuffer} arrayBuffer The array buffer to clone.\n * @returns {ArrayBuffer} Returns the cloned array buffer.\n */\n function cloneArrayBuffer(arrayBuffer) {\n var result = new arrayBuffer.constructor(arrayBuffer.byteLength);\n new Uint8Array(result).set(new Uint8Array(arrayBuffer));\n return result;\n }\n\n /**\n * Creates a clone of `dataView`.\n *\n * @private\n * @param {Object} dataView The data view to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned data view.\n */\n function cloneDataView(dataView, isDeep) {\n var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;\n return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);\n }\n\n /**\n * Creates a clone of `regexp`.\n *\n * @private\n * @param {Object} regexp The regexp to clone.\n * @returns {Object} Returns the cloned regexp.\n */\n function cloneRegExp(regexp) {\n var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));\n result.lastIndex = regexp.lastIndex;\n return result;\n }\n\n /**\n * Creates a clone of the `symbol` object.\n *\n * @private\n * @param {Object} symbol The symbol object to clone.\n * @returns {Object} Returns the cloned symbol object.\n */\n function cloneSymbol(symbol) {\n return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};\n }\n\n /**\n * Creates a clone of `typedArray`.\n *\n * @private\n * @param {Object} typedArray The typed array to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned typed array.\n */\n function cloneTypedArray(typedArray, isDeep) {\n var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;\n return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);\n }\n\n /**\n * Compares values to sort them in ascending order.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {number} Returns the sort order indicator for `value`.\n */\n function compareAscending(value, other) {\n if (value !== other) {\n var valIsDefined = value !== undefined,\n valIsNull = value === null,\n valIsReflexive = value === value,\n valIsSymbol = isSymbol(value);\n\n var othIsDefined = other !== undefined,\n othIsNull = other === null,\n othIsReflexive = other === other,\n othIsSymbol = isSymbol(other);\n\n if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||\n (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||\n (valIsNull && othIsDefined && othIsReflexive) ||\n (!valIsDefined && othIsReflexive) ||\n !valIsReflexive) {\n return 1;\n }\n if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||\n (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||\n (othIsNull && valIsDefined && valIsReflexive) ||\n (!othIsDefined && valIsReflexive) ||\n !othIsReflexive) {\n return -1;\n }\n }\n return 0;\n }\n\n /**\n * Used by `_.orderBy` to compare multiple properties of a value to another\n * and stable sort them.\n *\n * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,\n * specify an order of \"desc\" for descending or \"asc\" for ascending sort order\n * of corresponding values.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {boolean[]|string[]} orders The order to sort by for each property.\n * @returns {number} Returns the sort order indicator for `object`.\n */\n function compareMultiple(object, other, orders) {\n var index = -1,\n objCriteria = object.criteria,\n othCriteria = other.criteria,\n length = objCriteria.length,\n ordersLength = orders.length;\n\n while (++index < length) {\n var result = compareAscending(objCriteria[index], othCriteria[index]);\n if (result) {\n if (index >= ordersLength) {\n return result;\n }\n var order = orders[index];\n return result * (order == 'desc' ? -1 : 1);\n }\n }\n // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications\n // that causes it, under certain circumstances, to provide the same value for\n // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247\n // for more details.\n //\n // This also ensures a stable sort in V8 and other engines.\n // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.\n return object.index - other.index;\n }\n\n /**\n * Creates an array that is the composition of partially applied arguments,\n * placeholders, and provided arguments into a single array of arguments.\n *\n * @private\n * @param {Array} args The provided arguments.\n * @param {Array} partials The arguments to prepend to those provided.\n * @param {Array} holders The `partials` placeholder indexes.\n * @params {boolean} [isCurried] Specify composing for a curried function.\n * @returns {Array} Returns the new array of composed arguments.\n */\n function composeArgs(args, partials, holders, isCurried) {\n var argsIndex = -1,\n argsLength = args.length,\n holdersLength = holders.length,\n leftIndex = -1,\n leftLength = partials.length,\n rangeLength = nativeMax(argsLength - holdersLength, 0),\n result = Array(leftLength + rangeLength),\n isUncurried = !isCurried;\n\n while (++leftIndex < leftLength) {\n result[leftIndex] = partials[leftIndex];\n }\n while (++argsIndex < holdersLength) {\n if (isUncurried || argsIndex < argsLength) {\n result[holders[argsIndex]] = args[argsIndex];\n }\n }\n while (rangeLength--) {\n result[leftIndex++] = args[argsIndex++];\n }\n return result;\n }\n\n /**\n * This function is like `composeArgs` except that the arguments composition\n * is tailored for `_.partialRight`.\n *\n * @private\n * @param {Array} args The provided arguments.\n * @param {Array} partials The arguments to append to those provided.\n * @param {Array} holders The `partials` placeholder indexes.\n * @params {boolean} [isCurried] Specify composing for a curried function.\n * @returns {Array} Returns the new array of composed arguments.\n */\n function composeArgsRight(args, partials, holders, isCurried) {\n var argsIndex = -1,\n argsLength = args.length,\n holdersIndex = -1,\n holdersLength = holders.length,\n rightIndex = -1,\n rightLength = partials.length,\n rangeLength = nativeMax(argsLength - holdersLength, 0),\n result = Array(rangeLength + rightLength),\n isUncurried = !isCurried;\n\n while (++argsIndex < rangeLength) {\n result[argsIndex] = args[argsIndex];\n }\n var offset = argsIndex;\n while (++rightIndex < rightLength) {\n result[offset + rightIndex] = partials[rightIndex];\n }\n while (++holdersIndex < holdersLength) {\n if (isUncurried || argsIndex < argsLength) {\n result[offset + holders[holdersIndex]] = args[argsIndex++];\n }\n }\n return result;\n }\n\n /**\n * Copies the values of `source` to `array`.\n *\n * @private\n * @param {Array} source The array to copy values from.\n * @param {Array} [array=[]] The array to copy values to.\n * @returns {Array} Returns `array`.\n */\n function copyArray(source, array) {\n var index = -1,\n length = source.length;\n\n array || (array = Array(length));\n while (++index < length) {\n array[index] = source[index];\n }\n return array;\n }\n\n /**\n * Copies properties of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy properties from.\n * @param {Array} props The property identifiers to copy.\n * @param {Object} [object={}] The object to copy properties to.\n * @param {Function} [customizer] The function to customize copied values.\n * @returns {Object} Returns `object`.\n */\n function copyObject(source, props, object, customizer) {\n var isNew = !object;\n object || (object = {});\n\n var index = -1,\n length = props.length;\n\n while (++index < length) {\n var key = props[index];\n\n var newValue = customizer\n ? customizer(object[key], source[key], key, object, source)\n : undefined;\n\n if (newValue === undefined) {\n newValue = source[key];\n }\n if (isNew) {\n baseAssignValue(object, key, newValue);\n } else {\n assignValue(object, key, newValue);\n }\n }\n return object;\n }\n\n /**\n * Copies own symbols of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\n function copySymbols(source, object) {\n return copyObject(source, getSymbols(source), object);\n }\n\n /**\n * Copies own and inherited symbols of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\n function copySymbolsIn(source, object) {\n return copyObject(source, getSymbolsIn(source), object);\n }\n\n /**\n * Creates a function like `_.groupBy`.\n *\n * @private\n * @param {Function} setter The function to set accumulator values.\n * @param {Function} [initializer] The accumulator object initializer.\n * @returns {Function} Returns the new aggregator function.\n */\n function createAggregator(setter, initializer) {\n return function(collection, iteratee) {\n var func = isArray(collection) ? arrayAggregator : baseAggregator,\n accumulator = initializer ? initializer() : {};\n\n return func(collection, setter, getIteratee(iteratee, 2), accumulator);\n };\n }\n\n /**\n * Creates a function like `_.assign`.\n *\n * @private\n * @param {Function} assigner The function to assign values.\n * @returns {Function} Returns the new assigner function.\n */\n function createAssigner(assigner) {\n return baseRest(function(object, sources) {\n var index = -1,\n length = sources.length,\n customizer = length > 1 ? sources[length - 1] : undefined,\n guard = length > 2 ? sources[2] : undefined;\n\n customizer = (assigner.length > 3 && typeof customizer == 'function')\n ? (length--, customizer)\n : undefined;\n\n if (guard && isIterateeCall(sources[0], sources[1], guard)) {\n customizer = length < 3 ? undefined : customizer;\n length = 1;\n }\n object = Object(object);\n while (++index < length) {\n var source = sources[index];\n if (source) {\n assigner(object, source, index, customizer);\n }\n }\n return object;\n });\n }\n\n /**\n * Creates a `baseEach` or `baseEachRight` function.\n *\n * @private\n * @param {Function} eachFunc The function to iterate over a collection.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Function} Returns the new base function.\n */\n function createBaseEach(eachFunc, fromRight) {\n return function(collection, iteratee) {\n if (collection == null) {\n return collection;\n }\n if (!isArrayLike(collection)) {\n return eachFunc(collection, iteratee);\n }\n var length = collection.length,\n index = fromRight ? length : -1,\n iterable = Object(collection);\n\n while ((fromRight ? index-- : ++index < length)) {\n if (iteratee(iterable[index], index, iterable) === false) {\n break;\n }\n }\n return collection;\n };\n }\n\n /**\n * Creates a base function for methods like `_.forIn` and `_.forOwn`.\n *\n * @private\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Function} Returns the new base function.\n */\n function createBaseFor(fromRight) {\n return function(object, iteratee, keysFunc) {\n var index = -1,\n iterable = Object(object),\n props = keysFunc(object),\n length = props.length;\n\n while (length--) {\n var key = props[fromRight ? length : ++index];\n if (iteratee(iterable[key], key, iterable) === false) {\n break;\n }\n }\n return object;\n };\n }\n\n /**\n * Creates a function that wraps `func` to invoke it with the optional `this`\n * binding of `thisArg`.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @param {*} [thisArg] The `this` binding of `func`.\n * @returns {Function} Returns the new wrapped function.\n */\n function createBind(func, bitmask, thisArg) {\n var isBind = bitmask & WRAP_BIND_FLAG,\n Ctor = createCtor(func);\n\n function wrapper() {\n var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;\n return fn.apply(isBind ? thisArg : this, arguments);\n }\n return wrapper;\n }\n\n /**\n * Creates a function like `_.lowerFirst`.\n *\n * @private\n * @param {string} methodName The name of the `String` case method to use.\n * @returns {Function} Returns the new case function.\n */\n function createCaseFirst(methodName) {\n return function(string) {\n string = toString(string);\n\n var strSymbols = hasUnicode(string)\n ? stringToArray(string)\n : undefined;\n\n var chr = strSymbols\n ? strSymbols[0]\n : string.charAt(0);\n\n var trailing = strSymbols\n ? castSlice(strSymbols, 1).join('')\n : string.slice(1);\n\n return chr[methodName]() + trailing;\n };\n }\n\n /**\n * Creates a function like `_.camelCase`.\n *\n * @private\n * @param {Function} callback The function to combine each word.\n * @returns {Function} Returns the new compounder function.\n */\n function createCompounder(callback) {\n return function(string) {\n return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');\n };\n }\n\n /**\n * Creates a function that produces an instance of `Ctor` regardless of\n * whether it was invoked as part of a `new` expression or by `call` or `apply`.\n *\n * @private\n * @param {Function} Ctor The constructor to wrap.\n * @returns {Function} Returns the new wrapped function.\n */\n function createCtor(Ctor) {\n return function() {\n // Use a `switch` statement to work with class constructors. See\n // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist\n // for more details.\n var args = arguments;\n switch (args.length) {\n case 0: return new Ctor;\n case 1: return new Ctor(args[0]);\n case 2: return new Ctor(args[0], args[1]);\n case 3: return new Ctor(args[0], args[1], args[2]);\n case 4: return new Ctor(args[0], args[1], args[2], args[3]);\n case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);\n case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);\n case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);\n }\n var thisBinding = baseCreate(Ctor.prototype),\n result = Ctor.apply(thisBinding, args);\n\n // Mimic the constructor's `return` behavior.\n // See https://es5.github.io/#x13.2.2 for more details.\n return isObject(result) ? result : thisBinding;\n };\n }\n\n /**\n * Creates a function that wraps `func` to enable currying.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @param {number} arity The arity of `func`.\n * @returns {Function} Returns the new wrapped function.\n */\n function createCurry(func, bitmask, arity) {\n var Ctor = createCtor(func);\n\n function wrapper() {\n var length = arguments.length,\n args = Array(length),\n index = length,\n placeholder = getHolder(wrapper);\n\n while (index--) {\n args[index] = arguments[index];\n }\n var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)\n ? []\n : replaceHolders(args, placeholder);\n\n length -= holders.length;\n if (length < arity) {\n return createRecurry(\n func, bitmask, createHybrid, wrapper.placeholder, undefined,\n args, holders, undefined, undefined, arity - length);\n }\n var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;\n return apply(fn, this, args);\n }\n return wrapper;\n }\n\n /**\n * Creates a `_.find` or `_.findLast` function.\n *\n * @private\n * @param {Function} findIndexFunc The function to find the collection index.\n * @returns {Function} Returns the new find function.\n */\n function createFind(findIndexFunc) {\n return function(collection, predicate, fromIndex) {\n var iterable = Object(collection);\n if (!isArrayLike(collection)) {\n var iteratee = getIteratee(predicate, 3);\n collection = keys(collection);\n predicate = function(key) { return iteratee(iterable[key], key, iterable); };\n }\n var index = findIndexFunc(collection, predicate, fromIndex);\n return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;\n };\n }\n\n /**\n * Creates a `_.flow` or `_.flowRight` function.\n *\n * @private\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Function} Returns the new flow function.\n */\n function createFlow(fromRight) {\n return flatRest(function(funcs) {\n var length = funcs.length,\n index = length,\n prereq = LodashWrapper.prototype.thru;\n\n if (fromRight) {\n funcs.reverse();\n }\n while (index--) {\n var func = funcs[index];\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n if (prereq && !wrapper && getFuncName(func) == 'wrapper') {\n var wrapper = new LodashWrapper([], true);\n }\n }\n index = wrapper ? index : length;\n while (++index < length) {\n func = funcs[index];\n\n var funcName = getFuncName(func),\n data = funcName == 'wrapper' ? getData(func) : undefined;\n\n if (data && isLaziable(data[0]) &&\n data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&\n !data[4].length && data[9] == 1\n ) {\n wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);\n } else {\n wrapper = (func.length == 1 && isLaziable(func))\n ? wrapper[funcName]()\n : wrapper.thru(func);\n }\n }\n return function() {\n var args = arguments,\n value = args[0];\n\n if (wrapper && args.length == 1 && isArray(value)) {\n return wrapper.plant(value).value();\n }\n var index = 0,\n result = length ? funcs[index].apply(this, args) : value;\n\n while (++index < length) {\n result = funcs[index].call(this, result);\n }\n return result;\n };\n });\n }\n\n /**\n * Creates a function that wraps `func` to invoke it with optional `this`\n * binding of `thisArg`, partial application, and currying.\n *\n * @private\n * @param {Function|string} func The function or method name to wrap.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @param {*} [thisArg] The `this` binding of `func`.\n * @param {Array} [partials] The arguments to prepend to those provided to\n * the new function.\n * @param {Array} [holders] The `partials` placeholder indexes.\n * @param {Array} [partialsRight] The arguments to append to those provided\n * to the new function.\n * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.\n * @param {Array} [argPos] The argument positions of the new function.\n * @param {number} [ary] The arity cap of `func`.\n * @param {number} [arity] The arity of `func`.\n * @returns {Function} Returns the new wrapped function.\n */\n function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {\n var isAry = bitmask & WRAP_ARY_FLAG,\n isBind = bitmask & WRAP_BIND_FLAG,\n isBindKey = bitmask & WRAP_BIND_KEY_FLAG,\n isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),\n isFlip = bitmask & WRAP_FLIP_FLAG,\n Ctor = isBindKey ? undefined : createCtor(func);\n\n function wrapper() {\n var length = arguments.length,\n args = Array(length),\n index = length;\n\n while (index--) {\n args[index] = arguments[index];\n }\n if (isCurried) {\n var placeholder = getHolder(wrapper),\n holdersCount = countHolders(args, placeholder);\n }\n if (partials) {\n args = composeArgs(args, partials, holders, isCurried);\n }\n if (partialsRight) {\n args = composeArgsRight(args, partialsRight, holdersRight, isCurried);\n }\n length -= holdersCount;\n if (isCurried && length < arity) {\n var newHolders = replaceHolders(args, placeholder);\n return createRecurry(\n func, bitmask, createHybrid, wrapper.placeholder, thisArg,\n args, newHolders, argPos, ary, arity - length\n );\n }\n var thisBinding = isBind ? thisArg : this,\n fn = isBindKey ? thisBinding[func] : func;\n\n length = args.length;\n if (argPos) {\n args = reorder(args, argPos);\n } else if (isFlip && length > 1) {\n args.reverse();\n }\n if (isAry && ary < length) {\n args.length = ary;\n }\n if (this && this !== root && this instanceof wrapper) {\n fn = Ctor || createCtor(fn);\n }\n return fn.apply(thisBinding, args);\n }\n return wrapper;\n }\n\n /**\n * Creates a function like `_.invertBy`.\n *\n * @private\n * @param {Function} setter The function to set accumulator values.\n * @param {Function} toIteratee The function to resolve iteratees.\n * @returns {Function} Returns the new inverter function.\n */\n function createInverter(setter, toIteratee) {\n return function(object, iteratee) {\n return baseInverter(object, setter, toIteratee(iteratee), {});\n };\n }\n\n /**\n * Creates a function that performs a mathematical operation on two values.\n *\n * @private\n * @param {Function} operator The function to perform the operation.\n * @param {number} [defaultValue] The value used for `undefined` arguments.\n * @returns {Function} Returns the new mathematical operation function.\n */\n function createMathOperation(operator, defaultValue) {\n return function(value, other) {\n var result;\n if (value === undefined && other === undefined) {\n return defaultValue;\n }\n if (value !== undefined) {\n result = value;\n }\n if (other !== undefined) {\n if (result === undefined) {\n return other;\n }\n if (typeof value == 'string' || typeof other == 'string') {\n value = baseToString(value);\n other = baseToString(other);\n } else {\n value = baseToNumber(value);\n other = baseToNumber(other);\n }\n result = operator(value, other);\n }\n return result;\n };\n }\n\n /**\n * Creates a function like `_.over`.\n *\n * @private\n * @param {Function} arrayFunc The function to iterate over iteratees.\n * @returns {Function} Returns the new over function.\n */\n function createOver(arrayFunc) {\n return flatRest(function(iteratees) {\n iteratees = arrayMap(iteratees, baseUnary(getIteratee()));\n return baseRest(function(args) {\n var thisArg = this;\n return arrayFunc(iteratees, function(iteratee) {\n return apply(iteratee, thisArg, args);\n });\n });\n });\n }\n\n /**\n * Creates the padding for `string` based on `length`. The `chars` string\n * is truncated if the number of characters exceeds `length`.\n *\n * @private\n * @param {number} length The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padding for `string`.\n */\n function createPadding(length, chars) {\n chars = chars === undefined ? ' ' : baseToString(chars);\n\n var charsLength = chars.length;\n if (charsLength < 2) {\n return charsLength ? baseRepeat(chars, length) : chars;\n }\n var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));\n return hasUnicode(chars)\n ? castSlice(stringToArray(result), 0, length).join('')\n : result.slice(0, length);\n }\n\n /**\n * Creates a function that wraps `func` to invoke it with the `this` binding\n * of `thisArg` and `partials` prepended to the arguments it receives.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {Array} partials The arguments to prepend to those provided to\n * the new function.\n * @returns {Function} Returns the new wrapped function.\n */\n function createPartial(func, bitmask, thisArg, partials) {\n var isBind = bitmask & WRAP_BIND_FLAG,\n Ctor = createCtor(func);\n\n function wrapper() {\n var argsIndex = -1,\n argsLength = arguments.length,\n leftIndex = -1,\n leftLength = partials.length,\n args = Array(leftLength + argsLength),\n fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;\n\n while (++leftIndex < leftLength) {\n args[leftIndex] = partials[leftIndex];\n }\n while (argsLength--) {\n args[leftIndex++] = arguments[++argsIndex];\n }\n return apply(fn, isBind ? thisArg : this, args);\n }\n return wrapper;\n }\n\n /**\n * Creates a `_.range` or `_.rangeRight` function.\n *\n * @private\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Function} Returns the new range function.\n */\n function createRange(fromRight) {\n return function(start, end, step) {\n if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {\n end = step = undefined;\n }\n // Ensure the sign of `-0` is preserved.\n start = toFinite(start);\n if (end === undefined) {\n end = start;\n start = 0;\n } else {\n end = toFinite(end);\n }\n step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);\n return baseRange(start, end, step, fromRight);\n };\n }\n\n /**\n * Creates a function that performs a relational operation on two values.\n *\n * @private\n * @param {Function} operator The function to perform the operation.\n * @returns {Function} Returns the new relational operation function.\n */\n function createRelationalOperation(operator) {\n return function(value, other) {\n if (!(typeof value == 'string' && typeof other == 'string')) {\n value = toNumber(value);\n other = toNumber(other);\n }\n return operator(value, other);\n };\n }\n\n /**\n * Creates a function that wraps `func` to continue currying.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @param {Function} wrapFunc The function to create the `func` wrapper.\n * @param {*} placeholder The placeholder value.\n * @param {*} [thisArg] The `this` binding of `func`.\n * @param {Array} [partials] The arguments to prepend to those provided to\n * the new function.\n * @param {Array} [holders] The `partials` placeholder indexes.\n * @param {Array} [argPos] The argument positions of the new function.\n * @param {number} [ary] The arity cap of `func`.\n * @param {number} [arity] The arity of `func`.\n * @returns {Function} Returns the new wrapped function.\n */\n function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {\n var isCurry = bitmask & WRAP_CURRY_FLAG,\n newHolders = isCurry ? holders : undefined,\n newHoldersRight = isCurry ? undefined : holders,\n newPartials = isCurry ? partials : undefined,\n newPartialsRight = isCurry ? undefined : partials;\n\n bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);\n bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);\n\n if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {\n bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);\n }\n var newData = [\n func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,\n newHoldersRight, argPos, ary, arity\n ];\n\n var result = wrapFunc.apply(undefined, newData);\n if (isLaziable(func)) {\n setData(result, newData);\n }\n result.placeholder = placeholder;\n return setWrapToString(result, func, bitmask);\n }\n\n /**\n * Creates a function like `_.round`.\n *\n * @private\n * @param {string} methodName The name of the `Math` method to use when rounding.\n * @returns {Function} Returns the new round function.\n */\n function createRound(methodName) {\n var func = Math[methodName];\n return function(number, precision) {\n number = toNumber(number);\n precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);\n if (precision && nativeIsFinite(number)) {\n // Shift with exponential notation to avoid floating-point issues.\n // See [MDN](https://mdn.io/round#Examples) for more details.\n var pair = (toString(number) + 'e').split('e'),\n value = func(pair[0] + 'e' + (+pair[1] + precision));\n\n pair = (toString(value) + 'e').split('e');\n return +(pair[0] + 'e' + (+pair[1] - precision));\n }\n return func(number);\n };\n }\n\n /**\n * Creates a set object of `values`.\n *\n * @private\n * @param {Array} values The values to add to the set.\n * @returns {Object} Returns the new set.\n */\n var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {\n return new Set(values);\n };\n\n /**\n * Creates a `_.toPairs` or `_.toPairsIn` function.\n *\n * @private\n * @param {Function} keysFunc The function to get the keys of a given object.\n * @returns {Function} Returns the new pairs function.\n */\n function createToPairs(keysFunc) {\n return function(object) {\n var tag = getTag(object);\n if (tag == mapTag) {\n return mapToArray(object);\n }\n if (tag == setTag) {\n return setToPairs(object);\n }\n return baseToPairs(object, keysFunc(object));\n };\n }\n\n /**\n * Creates a function that either curries or invokes `func` with optional\n * `this` binding and partially applied arguments.\n *\n * @private\n * @param {Function|string} func The function or method name to wrap.\n * @param {number} bitmask The bitmask flags.\n * 1 - `_.bind`\n * 2 - `_.bindKey`\n * 4 - `_.curry` or `_.curryRight` of a bound function\n * 8 - `_.curry`\n * 16 - `_.curryRight`\n * 32 - `_.partial`\n * 64 - `_.partialRight`\n * 128 - `_.rearg`\n * 256 - `_.ary`\n * 512 - `_.flip`\n * @param {*} [thisArg] The `this` binding of `func`.\n * @param {Array} [partials] The arguments to be partially applied.\n * @param {Array} [holders] The `partials` placeholder indexes.\n * @param {Array} [argPos] The argument positions of the new function.\n * @param {number} [ary] The arity cap of `func`.\n * @param {number} [arity] The arity of `func`.\n * @returns {Function} Returns the new wrapped function.\n */\n function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {\n var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;\n if (!isBindKey && typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n var length = partials ? partials.length : 0;\n if (!length) {\n bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);\n partials = holders = undefined;\n }\n ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);\n arity = arity === undefined ? arity : toInteger(arity);\n length -= holders ? holders.length : 0;\n\n if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {\n var partialsRight = partials,\n holdersRight = holders;\n\n partials = holders = undefined;\n }\n var data = isBindKey ? undefined : getData(func);\n\n var newData = [\n func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,\n argPos, ary, arity\n ];\n\n if (data) {\n mergeData(newData, data);\n }\n func = newData[0];\n bitmask = newData[1];\n thisArg = newData[2];\n partials = newData[3];\n holders = newData[4];\n arity = newData[9] = newData[9] === undefined\n ? (isBindKey ? 0 : func.length)\n : nativeMax(newData[9] - length, 0);\n\n if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {\n bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);\n }\n if (!bitmask || bitmask == WRAP_BIND_FLAG) {\n var result = createBind(func, bitmask, thisArg);\n } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {\n result = createCurry(func, bitmask, arity);\n } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {\n result = createPartial(func, bitmask, thisArg, partials);\n } else {\n result = createHybrid.apply(undefined, newData);\n }\n var setter = data ? baseSetData : setData;\n return setWrapToString(setter(result, newData), func, bitmask);\n }\n\n /**\n * Used by `_.defaults` to customize its `_.assignIn` use to assign properties\n * of source objects to the destination object for all destination properties\n * that resolve to `undefined`.\n *\n * @private\n * @param {*} objValue The destination value.\n * @param {*} srcValue The source value.\n * @param {string} key The key of the property to assign.\n * @param {Object} object The parent object of `objValue`.\n * @returns {*} Returns the value to assign.\n */\n function customDefaultsAssignIn(objValue, srcValue, key, object) {\n if (objValue === undefined ||\n (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {\n return srcValue;\n }\n return objValue;\n }\n\n /**\n * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source\n * objects into destination objects that are passed thru.\n *\n * @private\n * @param {*} objValue The destination value.\n * @param {*} srcValue The source value.\n * @param {string} key The key of the property to merge.\n * @param {Object} object The parent object of `objValue`.\n * @param {Object} source The parent object of `srcValue`.\n * @param {Object} [stack] Tracks traversed source values and their merged\n * counterparts.\n * @returns {*} Returns the value to assign.\n */\n function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {\n if (isObject(objValue) && isObject(srcValue)) {\n // Recursively merge objects and arrays (susceptible to call stack limits).\n stack.set(srcValue, objValue);\n baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);\n stack['delete'](srcValue);\n }\n return objValue;\n }\n\n /**\n * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain\n * objects.\n *\n * @private\n * @param {*} value The value to inspect.\n * @param {string} key The key of the property to inspect.\n * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.\n */\n function customOmitClone(value) {\n return isPlainObject(value) ? undefined : value;\n }\n\n /**\n * A specialized version of `baseIsEqualDeep` for arrays with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Array} array The array to compare.\n * @param {Array} other The other array to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `array` and `other` objects.\n * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.\n */\n function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n arrLength = array.length,\n othLength = other.length;\n\n if (arrLength != othLength && !(isPartial && othLength > arrLength)) {\n return false;\n }\n // Check that cyclic values are equal.\n var arrStacked = stack.get(array);\n var othStacked = stack.get(other);\n if (arrStacked && othStacked) {\n return arrStacked == other && othStacked == array;\n }\n var index = -1,\n result = true,\n seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;\n\n stack.set(array, other);\n stack.set(other, array);\n\n // Ignore non-index properties.\n while (++index < arrLength) {\n var arrValue = array[index],\n othValue = other[index];\n\n if (customizer) {\n var compared = isPartial\n ? customizer(othValue, arrValue, index, other, array, stack)\n : customizer(arrValue, othValue, index, array, other, stack);\n }\n if (compared !== undefined) {\n if (compared) {\n continue;\n }\n result = false;\n break;\n }\n // Recursively compare arrays (susceptible to call stack limits).\n if (seen) {\n if (!arraySome(other, function(othValue, othIndex) {\n if (!cacheHas(seen, othIndex) &&\n (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {\n return seen.push(othIndex);\n }\n })) {\n result = false;\n break;\n }\n } else if (!(\n arrValue === othValue ||\n equalFunc(arrValue, othValue, bitmask, customizer, stack)\n )) {\n result = false;\n break;\n }\n }\n stack['delete'](array);\n stack['delete'](other);\n return result;\n }\n\n /**\n * A specialized version of `baseIsEqualDeep` for comparing objects of\n * the same `toStringTag`.\n *\n * **Note:** This function only supports comparing values with tags of\n * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {string} tag The `toStringTag` of the objects to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\n function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {\n switch (tag) {\n case dataViewTag:\n if ((object.byteLength != other.byteLength) ||\n (object.byteOffset != other.byteOffset)) {\n return false;\n }\n object = object.buffer;\n other = other.buffer;\n\n case arrayBufferTag:\n if ((object.byteLength != other.byteLength) ||\n !equalFunc(new Uint8Array(object), new Uint8Array(other))) {\n return false;\n }\n return true;\n\n case boolTag:\n case dateTag:\n case numberTag:\n // Coerce booleans to `1` or `0` and dates to milliseconds.\n // Invalid dates are coerced to `NaN`.\n return eq(+object, +other);\n\n case errorTag:\n return object.name == other.name && object.message == other.message;\n\n case regexpTag:\n case stringTag:\n // Coerce regexes to strings and treat strings, primitives and objects,\n // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring\n // for more details.\n return object == (other + '');\n\n case mapTag:\n var convert = mapToArray;\n\n case setTag:\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG;\n convert || (convert = setToArray);\n\n if (object.size != other.size && !isPartial) {\n return false;\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(object);\n if (stacked) {\n return stacked == other;\n }\n bitmask |= COMPARE_UNORDERED_FLAG;\n\n // Recursively compare objects (susceptible to call stack limits).\n stack.set(object, other);\n var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);\n stack['delete'](object);\n return result;\n\n case symbolTag:\n if (symbolValueOf) {\n return symbolValueOf.call(object) == symbolValueOf.call(other);\n }\n }\n return false;\n }\n\n /**\n * A specialized version of `baseIsEqualDeep` for objects with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\n function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n objProps = getAllKeys(object),\n objLength = objProps.length,\n othProps = getAllKeys(other),\n othLength = othProps.length;\n\n if (objLength != othLength && !isPartial) {\n return false;\n }\n var index = objLength;\n while (index--) {\n var key = objProps[index];\n if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {\n return false;\n }\n }\n // Check that cyclic values are equal.\n var objStacked = stack.get(object);\n var othStacked = stack.get(other);\n if (objStacked && othStacked) {\n return objStacked == other && othStacked == object;\n }\n var result = true;\n stack.set(object, other);\n stack.set(other, object);\n\n var skipCtor = isPartial;\n while (++index < objLength) {\n key = objProps[index];\n var objValue = object[key],\n othValue = other[key];\n\n if (customizer) {\n var compared = isPartial\n ? customizer(othValue, objValue, key, other, object, stack)\n : customizer(objValue, othValue, key, object, other, stack);\n }\n // Recursively compare objects (susceptible to call stack limits).\n if (!(compared === undefined\n ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))\n : compared\n )) {\n result = false;\n break;\n }\n skipCtor || (skipCtor = key == 'constructor');\n }\n if (result && !skipCtor) {\n var objCtor = object.constructor,\n othCtor = other.constructor;\n\n // Non `Object` object instances with different constructors are not equal.\n if (objCtor != othCtor &&\n ('constructor' in object && 'constructor' in other) &&\n !(typeof objCtor == 'function' && objCtor instanceof objCtor &&\n typeof othCtor == 'function' && othCtor instanceof othCtor)) {\n result = false;\n }\n }\n stack['delete'](object);\n stack['delete'](other);\n return result;\n }\n\n /**\n * A specialized version of `baseRest` which flattens the rest array.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @returns {Function} Returns the new function.\n */\n function flatRest(func) {\n return setToString(overRest(func, undefined, flatten), func + '');\n }\n\n /**\n * Creates an array of own enumerable property names and symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\n function getAllKeys(object) {\n return baseGetAllKeys(object, keys, getSymbols);\n }\n\n /**\n * Creates an array of own and inherited enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\n function getAllKeysIn(object) {\n return baseGetAllKeys(object, keysIn, getSymbolsIn);\n }\n\n /**\n * Gets metadata for `func`.\n *\n * @private\n * @param {Function} func The function to query.\n * @returns {*} Returns the metadata for `func`.\n */\n var getData = !metaMap ? noop : function(func) {\n return metaMap.get(func);\n };\n\n /**\n * Gets the name of `func`.\n *\n * @private\n * @param {Function} func The function to query.\n * @returns {string} Returns the function name.\n */\n function getFuncName(func) {\n var result = (func.name + ''),\n array = realNames[result],\n length = hasOwnProperty.call(realNames, result) ? array.length : 0;\n\n while (length--) {\n var data = array[length],\n otherFunc = data.func;\n if (otherFunc == null || otherFunc == func) {\n return data.name;\n }\n }\n return result;\n }\n\n /**\n * Gets the argument placeholder value for `func`.\n *\n * @private\n * @param {Function} func The function to inspect.\n * @returns {*} Returns the placeholder value.\n */\n function getHolder(func) {\n var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;\n return object.placeholder;\n }\n\n /**\n * Gets the appropriate \"iteratee\" function. If `_.iteratee` is customized,\n * this function returns the custom method, otherwise it returns `baseIteratee`.\n * If arguments are provided, the chosen function is invoked with them and\n * its result is returned.\n *\n * @private\n * @param {*} [value] The value to convert to an iteratee.\n * @param {number} [arity] The arity of the created iteratee.\n * @returns {Function} Returns the chosen function or its result.\n */\n function getIteratee() {\n var result = lodash.iteratee || iteratee;\n result = result === iteratee ? baseIteratee : result;\n return arguments.length ? result(arguments[0], arguments[1]) : result;\n }\n\n /**\n * Gets the data for `map`.\n *\n * @private\n * @param {Object} map The map to query.\n * @param {string} key The reference key.\n * @returns {*} Returns the map data.\n */\n function getMapData(map, key) {\n var data = map.__data__;\n return isKeyable(key)\n ? data[typeof key == 'string' ? 'string' : 'hash']\n : data.map;\n }\n\n /**\n * Gets the property names, values, and compare flags of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the match data of `object`.\n */\n function getMatchData(object) {\n var result = keys(object),\n length = result.length;\n\n while (length--) {\n var key = result[length],\n value = object[key];\n\n result[length] = [key, value, isStrictComparable(value)];\n }\n return result;\n }\n\n /**\n * Gets the native function at `key` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the method to get.\n * @returns {*} Returns the function if it's native, else `undefined`.\n */\n function getNative(object, key) {\n var value = getValue(object, key);\n return baseIsNative(value) ? value : undefined;\n }\n\n /**\n * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the raw `toStringTag`.\n */\n function getRawTag(value) {\n var isOwn = hasOwnProperty.call(value, symToStringTag),\n tag = value[symToStringTag];\n\n try {\n value[symToStringTag] = undefined;\n var unmasked = true;\n } catch (e) {}\n\n var result = nativeObjectToString.call(value);\n if (unmasked) {\n if (isOwn) {\n value[symToStringTag] = tag;\n } else {\n delete value[symToStringTag];\n }\n }\n return result;\n }\n\n /**\n * Creates an array of the own enumerable symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\n var getSymbols = !nativeGetSymbols ? stubArray : function(object) {\n if (object == null) {\n return [];\n }\n object = Object(object);\n return arrayFilter(nativeGetSymbols(object), function(symbol) {\n return propertyIsEnumerable.call(object, symbol);\n });\n };\n\n /**\n * Creates an array of the own and inherited enumerable symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\n var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {\n var result = [];\n while (object) {\n arrayPush(result, getSymbols(object));\n object = getPrototype(object);\n }\n return result;\n };\n\n /**\n * Gets the `toStringTag` of `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\n var getTag = baseGetTag;\n\n // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.\n if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||\n (Map && getTag(new Map) != mapTag) ||\n (Promise && getTag(Promise.resolve()) != promiseTag) ||\n (Set && getTag(new Set) != setTag) ||\n (WeakMap && getTag(new WeakMap) != weakMapTag)) {\n getTag = function(value) {\n var result = baseGetTag(value),\n Ctor = result == objectTag ? value.constructor : undefined,\n ctorString = Ctor ? toSource(Ctor) : '';\n\n if (ctorString) {\n switch (ctorString) {\n case dataViewCtorString: return dataViewTag;\n case mapCtorString: return mapTag;\n case promiseCtorString: return promiseTag;\n case setCtorString: return setTag;\n case weakMapCtorString: return weakMapTag;\n }\n }\n return result;\n };\n }\n\n /**\n * Gets the view, applying any `transforms` to the `start` and `end` positions.\n *\n * @private\n * @param {number} start The start of the view.\n * @param {number} end The end of the view.\n * @param {Array} transforms The transformations to apply to the view.\n * @returns {Object} Returns an object containing the `start` and `end`\n * positions of the view.\n */\n function getView(start, end, transforms) {\n var index = -1,\n length = transforms.length;\n\n while (++index < length) {\n var data = transforms[index],\n size = data.size;\n\n switch (data.type) {\n case 'drop': start += size; break;\n case 'dropRight': end -= size; break;\n case 'take': end = nativeMin(end, start + size); break;\n case 'takeRight': start = nativeMax(start, end - size); break;\n }\n }\n return { 'start': start, 'end': end };\n }\n\n /**\n * Extracts wrapper details from the `source` body comment.\n *\n * @private\n * @param {string} source The source to inspect.\n * @returns {Array} Returns the wrapper details.\n */\n function getWrapDetails(source) {\n var match = source.match(reWrapDetails);\n return match ? match[1].split(reSplitDetails) : [];\n }\n\n /**\n * Checks if `path` exists on `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @param {Function} hasFunc The function to check properties.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n */\n function hasPath(object, path, hasFunc) {\n path = castPath(path, object);\n\n var index = -1,\n length = path.length,\n result = false;\n\n while (++index < length) {\n var key = toKey(path[index]);\n if (!(result = object != null && hasFunc(object, key))) {\n break;\n }\n object = object[key];\n }\n if (result || ++index != length) {\n return result;\n }\n length = object == null ? 0 : object.length;\n return !!length && isLength(length) && isIndex(key, length) &&\n (isArray(object) || isArguments(object));\n }\n\n /**\n * Initializes an array clone.\n *\n * @private\n * @param {Array} array The array to clone.\n * @returns {Array} Returns the initialized clone.\n */\n function initCloneArray(array) {\n var length = array.length,\n result = new array.constructor(length);\n\n // Add properties assigned by `RegExp#exec`.\n if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {\n result.index = array.index;\n result.input = array.input;\n }\n return result;\n }\n\n /**\n * Initializes an object clone.\n *\n * @private\n * @param {Object} object The object to clone.\n * @returns {Object} Returns the initialized clone.\n */\n function initCloneObject(object) {\n return (typeof object.constructor == 'function' && !isPrototype(object))\n ? baseCreate(getPrototype(object))\n : {};\n }\n\n /**\n * Initializes an object clone based on its `toStringTag`.\n *\n * **Note:** This function only supports cloning values with tags of\n * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.\n *\n * @private\n * @param {Object} object The object to clone.\n * @param {string} tag The `toStringTag` of the object to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the initialized clone.\n */\n function initCloneByTag(object, tag, isDeep) {\n var Ctor = object.constructor;\n switch (tag) {\n case arrayBufferTag:\n return cloneArrayBuffer(object);\n\n case boolTag:\n case dateTag:\n return new Ctor(+object);\n\n case dataViewTag:\n return cloneDataView(object, isDeep);\n\n case float32Tag: case float64Tag:\n case int8Tag: case int16Tag: case int32Tag:\n case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:\n return cloneTypedArray(object, isDeep);\n\n case mapTag:\n return new Ctor;\n\n case numberTag:\n case stringTag:\n return new Ctor(object);\n\n case regexpTag:\n return cloneRegExp(object);\n\n case setTag:\n return new Ctor;\n\n case symbolTag:\n return cloneSymbol(object);\n }\n }\n\n /**\n * Inserts wrapper `details` in a comment at the top of the `source` body.\n *\n * @private\n * @param {string} source The source to modify.\n * @returns {Array} details The details to insert.\n * @returns {string} Returns the modified source.\n */\n function insertWrapDetails(source, details) {\n var length = details.length;\n if (!length) {\n return source;\n }\n var lastIndex = length - 1;\n details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];\n details = details.join(length > 2 ? ', ' : ' ');\n return source.replace(reWrapComment, '{\\n/* [wrapped with ' + details + '] */\\n');\n }\n\n /**\n * Checks if `value` is a flattenable `arguments` object or array.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.\n */\n function isFlattenable(value) {\n return isArray(value) || isArguments(value) ||\n !!(spreadableSymbol && value && value[spreadableSymbol]);\n }\n\n /**\n * Checks if `value` is a valid array-like index.\n *\n * @private\n * @param {*} value The value to check.\n * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.\n * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.\n */\n function isIndex(value, length) {\n var type = typeof value;\n length = length == null ? MAX_SAFE_INTEGER : length;\n\n return !!length &&\n (type == 'number' ||\n (type != 'symbol' && reIsUint.test(value))) &&\n (value > -1 && value % 1 == 0 && value < length);\n }\n\n /**\n * Checks if the given arguments are from an iteratee call.\n *\n * @private\n * @param {*} value The potential iteratee value argument.\n * @param {*} index The potential iteratee index or key argument.\n * @param {*} object The potential iteratee object argument.\n * @returns {boolean} Returns `true` if the arguments are from an iteratee call,\n * else `false`.\n */\n function isIterateeCall(value, index, object) {\n if (!isObject(object)) {\n return false;\n }\n var type = typeof index;\n if (type == 'number'\n ? (isArrayLike(object) && isIndex(index, object.length))\n : (type == 'string' && index in object)\n ) {\n return eq(object[index], value);\n }\n return false;\n }\n\n /**\n * Checks if `value` is a property name and not a property path.\n *\n * @private\n * @param {*} value The value to check.\n * @param {Object} [object] The object to query keys on.\n * @returns {boolean} Returns `true` if `value` is a property name, else `false`.\n */\n function isKey(value, object) {\n if (isArray(value)) {\n return false;\n }\n var type = typeof value;\n if (type == 'number' || type == 'symbol' || type == 'boolean' ||\n value == null || isSymbol(value)) {\n return true;\n }\n return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||\n (object != null && value in Object(object));\n }\n\n /**\n * Checks if `value` is suitable for use as unique object key.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is suitable, else `false`.\n */\n function isKeyable(value) {\n var type = typeof value;\n return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')\n ? (value !== '__proto__')\n : (value === null);\n }\n\n /**\n * Checks if `func` has a lazy counterpart.\n *\n * @private\n * @param {Function} func The function to check.\n * @returns {boolean} Returns `true` if `func` has a lazy counterpart,\n * else `false`.\n */\n function isLaziable(func) {\n var funcName = getFuncName(func),\n other = lodash[funcName];\n\n if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {\n return false;\n }\n if (func === other) {\n return true;\n }\n var data = getData(other);\n return !!data && func === data[0];\n }\n\n /**\n * Checks if `func` has its source masked.\n *\n * @private\n * @param {Function} func The function to check.\n * @returns {boolean} Returns `true` if `func` is masked, else `false`.\n */\n function isMasked(func) {\n return !!maskSrcKey && (maskSrcKey in func);\n }\n\n /**\n * Checks if `func` is capable of being masked.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `func` is maskable, else `false`.\n */\n var isMaskable = coreJsData ? isFunction : stubFalse;\n\n /**\n * Checks if `value` is likely a prototype object.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.\n */\n function isPrototype(value) {\n var Ctor = value && value.constructor,\n proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;\n\n return value === proto;\n }\n\n /**\n * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` if suitable for strict\n * equality comparisons, else `false`.\n */\n function isStrictComparable(value) {\n return value === value && !isObject(value);\n }\n\n /**\n * A specialized version of `matchesProperty` for source values suitable\n * for strict equality comparisons, i.e. `===`.\n *\n * @private\n * @param {string} key The key of the property to get.\n * @param {*} srcValue The value to match.\n * @returns {Function} Returns the new spec function.\n */\n function matchesStrictComparable(key, srcValue) {\n return function(object) {\n if (object == null) {\n return false;\n }\n return object[key] === srcValue &&\n (srcValue !== undefined || (key in Object(object)));\n };\n }\n\n /**\n * A specialized version of `_.memoize` which clears the memoized function's\n * cache when it exceeds `MAX_MEMOIZE_SIZE`.\n *\n * @private\n * @param {Function} func The function to have its output memoized.\n * @returns {Function} Returns the new memoized function.\n */\n function memoizeCapped(func) {\n var result = memoize(func, function(key) {\n if (cache.size === MAX_MEMOIZE_SIZE) {\n cache.clear();\n }\n return key;\n });\n\n var cache = result.cache;\n return result;\n }\n\n /**\n * Merges the function metadata of `source` into `data`.\n *\n * Merging metadata reduces the number of wrappers used to invoke a function.\n * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`\n * may be applied regardless of execution order. Methods like `_.ary` and\n * `_.rearg` modify function arguments, making the order in which they are\n * executed important, preventing the merging of metadata. However, we make\n * an exception for a safe combined case where curried functions have `_.ary`\n * and or `_.rearg` applied.\n *\n * @private\n * @param {Array} data The destination metadata.\n * @param {Array} source The source metadata.\n * @returns {Array} Returns `data`.\n */\n function mergeData(data, source) {\n var bitmask = data[1],\n srcBitmask = source[1],\n newBitmask = bitmask | srcBitmask,\n isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);\n\n var isCombo =\n ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||\n ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||\n ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));\n\n // Exit early if metadata can't be merged.\n if (!(isCommon || isCombo)) {\n return data;\n }\n // Use source `thisArg` if available.\n if (srcBitmask & WRAP_BIND_FLAG) {\n data[2] = source[2];\n // Set when currying a bound function.\n newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;\n }\n // Compose partial arguments.\n var value = source[3];\n if (value) {\n var partials = data[3];\n data[3] = partials ? composeArgs(partials, value, source[4]) : value;\n data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];\n }\n // Compose partial right arguments.\n value = source[5];\n if (value) {\n partials = data[5];\n data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;\n data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];\n }\n // Use source `argPos` if available.\n value = source[7];\n if (value) {\n data[7] = value;\n }\n // Use source `ary` if it's smaller.\n if (srcBitmask & WRAP_ARY_FLAG) {\n data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);\n }\n // Use source `arity` if one is not provided.\n if (data[9] == null) {\n data[9] = source[9];\n }\n // Use source `func` and merge bitmasks.\n data[0] = source[0];\n data[1] = newBitmask;\n\n return data;\n }\n\n /**\n * This function is like\n * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * except that it includes inherited enumerable properties.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\n function nativeKeysIn(object) {\n var result = [];\n if (object != null) {\n for (var key in Object(object)) {\n result.push(key);\n }\n }\n return result;\n }\n\n /**\n * Converts `value` to a string using `Object.prototype.toString`.\n *\n * @private\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n */\n function objectToString(value) {\n return nativeObjectToString.call(value);\n }\n\n /**\n * A specialized version of `baseRest` which transforms the rest array.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @param {Function} transform The rest array transform.\n * @returns {Function} Returns the new function.\n */\n function overRest(func, start, transform) {\n start = nativeMax(start === undefined ? (func.length - 1) : start, 0);\n return function() {\n var args = arguments,\n index = -1,\n length = nativeMax(args.length - start, 0),\n array = Array(length);\n\n while (++index < length) {\n array[index] = args[start + index];\n }\n index = -1;\n var otherArgs = Array(start + 1);\n while (++index < start) {\n otherArgs[index] = args[index];\n }\n otherArgs[start] = transform(array);\n return apply(func, this, otherArgs);\n };\n }\n\n /**\n * Gets the parent value at `path` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array} path The path to get the parent value of.\n * @returns {*} Returns the parent value.\n */\n function parent(object, path) {\n return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));\n }\n\n /**\n * Reorder `array` according to the specified indexes where the element at\n * the first index is assigned as the first element, the element at\n * the second index is assigned as the second element, and so on.\n *\n * @private\n * @param {Array} array The array to reorder.\n * @param {Array} indexes The arranged array indexes.\n * @returns {Array} Returns `array`.\n */\n function reorder(array, indexes) {\n var arrLength = array.length,\n length = nativeMin(indexes.length, arrLength),\n oldArray = copyArray(array);\n\n while (length--) {\n var index = indexes[length];\n array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;\n }\n return array;\n }\n\n /**\n * Gets the value at `key`, unless `key` is \"__proto__\" or \"constructor\".\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the property to get.\n * @returns {*} Returns the property value.\n */\n function safeGet(object, key) {\n if (key === 'constructor' && typeof object[key] === 'function') {\n return;\n }\n\n if (key == '__proto__') {\n return;\n }\n\n return object[key];\n }\n\n /**\n * Sets metadata for `func`.\n *\n * **Note:** If this function becomes hot, i.e. is invoked a lot in a short\n * period of time, it will trip its breaker and transition to an identity\n * function to avoid garbage collection pauses in V8. See\n * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)\n * for more details.\n *\n * @private\n * @param {Function} func The function to associate metadata with.\n * @param {*} data The metadata.\n * @returns {Function} Returns `func`.\n */\n var setData = shortOut(baseSetData);\n\n /**\n * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).\n *\n * @private\n * @param {Function} func The function to delay.\n * @param {number} wait The number of milliseconds to delay invocation.\n * @returns {number|Object} Returns the timer id or timeout object.\n */\n var setTimeout = ctxSetTimeout || function(func, wait) {\n return root.setTimeout(func, wait);\n };\n\n /**\n * Sets the `toString` method of `func` to return `string`.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\n var setToString = shortOut(baseSetToString);\n\n /**\n * Sets the `toString` method of `wrapper` to mimic the source of `reference`\n * with wrapper details in a comment at the top of the source body.\n *\n * @private\n * @param {Function} wrapper The function to modify.\n * @param {Function} reference The reference function.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @returns {Function} Returns `wrapper`.\n */\n function setWrapToString(wrapper, reference, bitmask) {\n var source = (reference + '');\n return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));\n }\n\n /**\n * Creates a function that'll short out and invoke `identity` instead\n * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`\n * milliseconds.\n *\n * @private\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new shortable function.\n */\n function shortOut(func) {\n var count = 0,\n lastCalled = 0;\n\n return function() {\n var stamp = nativeNow(),\n remaining = HOT_SPAN - (stamp - lastCalled);\n\n lastCalled = stamp;\n if (remaining > 0) {\n if (++count >= HOT_COUNT) {\n return arguments[0];\n }\n } else {\n count = 0;\n }\n return func.apply(undefined, arguments);\n };\n }\n\n /**\n * A specialized version of `_.shuffle` which mutates and sets the size of `array`.\n *\n * @private\n * @param {Array} array The array to shuffle.\n * @param {number} [size=array.length] The size of `array`.\n * @returns {Array} Returns `array`.\n */\n function shuffleSelf(array, size) {\n var index = -1,\n length = array.length,\n lastIndex = length - 1;\n\n size = size === undefined ? length : size;\n while (++index < size) {\n var rand = baseRandom(index, lastIndex),\n value = array[rand];\n\n array[rand] = array[index];\n array[index] = value;\n }\n array.length = size;\n return array;\n }\n\n /**\n * Converts `string` to a property path array.\n *\n * @private\n * @param {string} string The string to convert.\n * @returns {Array} Returns the property path array.\n */\n var stringToPath = memoizeCapped(function(string) {\n var result = [];\n if (string.charCodeAt(0) === 46 /* . */) {\n result.push('');\n }\n string.replace(rePropName, function(match, number, quote, subString) {\n result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));\n });\n return result;\n });\n\n /**\n * Converts `value` to a string key if it's not a string or symbol.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {string|symbol} Returns the key.\n */\n function toKey(value) {\n if (typeof value == 'string' || isSymbol(value)) {\n return value;\n }\n var result = (value + '');\n return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;\n }\n\n /**\n * Converts `func` to its source code.\n *\n * @private\n * @param {Function} func The function to convert.\n * @returns {string} Returns the source code.\n */\n function toSource(func) {\n if (func != null) {\n try {\n return funcToString.call(func);\n } catch (e) {}\n try {\n return (func + '');\n } catch (e) {}\n }\n return '';\n }\n\n /**\n * Updates wrapper `details` based on `bitmask` flags.\n *\n * @private\n * @returns {Array} details The details to modify.\n * @param {number} bitmask The bitmask flags. See `createWrap` for more details.\n * @returns {Array} Returns `details`.\n */\n function updateWrapDetails(details, bitmask) {\n arrayEach(wrapFlags, function(pair) {\n var value = '_.' + pair[0];\n if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {\n details.push(value);\n }\n });\n return details.sort();\n }\n\n /**\n * Creates a clone of `wrapper`.\n *\n * @private\n * @param {Object} wrapper The wrapper to clone.\n * @returns {Object} Returns the cloned wrapper.\n */\n function wrapperClone(wrapper) {\n if (wrapper instanceof LazyWrapper) {\n return wrapper.clone();\n }\n var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);\n result.__actions__ = copyArray(wrapper.__actions__);\n result.__index__ = wrapper.__index__;\n result.__values__ = wrapper.__values__;\n return result;\n }\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates an array of elements split into groups the length of `size`.\n * If `array` can't be split evenly, the final chunk will be the remaining\n * elements.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to process.\n * @param {number} [size=1] The length of each chunk\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the new array of chunks.\n * @example\n *\n * _.chunk(['a', 'b', 'c', 'd'], 2);\n * // => [['a', 'b'], ['c', 'd']]\n *\n * _.chunk(['a', 'b', 'c', 'd'], 3);\n * // => [['a', 'b', 'c'], ['d']]\n */\n function chunk(array, size, guard) {\n if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {\n size = 1;\n } else {\n size = nativeMax(toInteger(size), 0);\n }\n var length = array == null ? 0 : array.length;\n if (!length || size < 1) {\n return [];\n }\n var index = 0,\n resIndex = 0,\n result = Array(nativeCeil(length / size));\n\n while (index < length) {\n result[resIndex++] = baseSlice(array, index, (index += size));\n }\n return result;\n }\n\n /**\n * Creates an array with all falsey values removed. The values `false`, `null`,\n * `0`, `\"\"`, `undefined`, and `NaN` are falsey.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to compact.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * _.compact([0, 1, false, 2, '', 3]);\n * // => [1, 2, 3]\n */\n function compact(array) {\n var index = -1,\n length = array == null ? 0 : array.length,\n resIndex = 0,\n result = [];\n\n while (++index < length) {\n var value = array[index];\n if (value) {\n result[resIndex++] = value;\n }\n }\n return result;\n }\n\n /**\n * Creates a new array concatenating `array` with any additional arrays\n * and/or values.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to concatenate.\n * @param {...*} [values] The values to concatenate.\n * @returns {Array} Returns the new concatenated array.\n * @example\n *\n * var array = [1];\n * var other = _.concat(array, 2, [3], [[4]]);\n *\n * console.log(other);\n * // => [1, 2, 3, [4]]\n *\n * console.log(array);\n * // => [1]\n */\n function concat() {\n var length = arguments.length;\n if (!length) {\n return [];\n }\n var args = Array(length - 1),\n array = arguments[0],\n index = length;\n\n while (index--) {\n args[index - 1] = arguments[index];\n }\n return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));\n }\n\n /**\n * Creates an array of `array` values not included in the other given arrays\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons. The order and references of result values are\n * determined by the first array.\n *\n * **Note:** Unlike `_.pullAll`, this method returns a new array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.without, _.xor\n * @example\n *\n * _.difference([2, 1], [2, 3]);\n * // => [1]\n */\n var difference = baseRest(function(array, values) {\n return isArrayLikeObject(array)\n ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))\n : [];\n });\n\n /**\n * This method is like `_.difference` except that it accepts `iteratee` which\n * is invoked for each element of `array` and `values` to generate the criterion\n * by which they're compared. The order and references of result values are\n * determined by the first array. The iteratee is invoked with one argument:\n * (value).\n *\n * **Note:** Unlike `_.pullAllBy`, this method returns a new array.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);\n * // => [1.2]\n *\n * // The `_.property` iteratee shorthand.\n * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');\n * // => [{ 'x': 2 }]\n */\n var differenceBy = baseRest(function(array, values) {\n var iteratee = last(values);\n if (isArrayLikeObject(iteratee)) {\n iteratee = undefined;\n }\n return isArrayLikeObject(array)\n ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))\n : [];\n });\n\n /**\n * This method is like `_.difference` except that it accepts `comparator`\n * which is invoked to compare elements of `array` to `values`. The order and\n * references of result values are determined by the first array. The comparator\n * is invoked with two arguments: (arrVal, othVal).\n *\n * **Note:** Unlike `_.pullAllWith`, this method returns a new array.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n *\n * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);\n * // => [{ 'x': 2, 'y': 1 }]\n */\n var differenceWith = baseRest(function(array, values) {\n var comparator = last(values);\n if (isArrayLikeObject(comparator)) {\n comparator = undefined;\n }\n return isArrayLikeObject(array)\n ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)\n : [];\n });\n\n /**\n * Creates a slice of `array` with `n` elements dropped from the beginning.\n *\n * @static\n * @memberOf _\n * @since 0.5.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to drop.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.drop([1, 2, 3]);\n * // => [2, 3]\n *\n * _.drop([1, 2, 3], 2);\n * // => [3]\n *\n * _.drop([1, 2, 3], 5);\n * // => []\n *\n * _.drop([1, 2, 3], 0);\n * // => [1, 2, 3]\n */\n function drop(array, n, guard) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return [];\n }\n n = (guard || n === undefined) ? 1 : toInteger(n);\n return baseSlice(array, n < 0 ? 0 : n, length);\n }\n\n /**\n * Creates a slice of `array` with `n` elements dropped from the end.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to drop.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.dropRight([1, 2, 3]);\n * // => [1, 2]\n *\n * _.dropRight([1, 2, 3], 2);\n * // => [1]\n *\n * _.dropRight([1, 2, 3], 5);\n * // => []\n *\n * _.dropRight([1, 2, 3], 0);\n * // => [1, 2, 3]\n */\n function dropRight(array, n, guard) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return [];\n }\n n = (guard || n === undefined) ? 1 : toInteger(n);\n n = length - n;\n return baseSlice(array, 0, n < 0 ? 0 : n);\n }\n\n /**\n * Creates a slice of `array` excluding elements dropped from the end.\n * Elements are dropped until `predicate` returns falsey. The predicate is\n * invoked with three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'active': true },\n * { 'user': 'fred', 'active': false },\n * { 'user': 'pebbles', 'active': false }\n * ];\n *\n * _.dropRightWhile(users, function(o) { return !o.active; });\n * // => objects for ['barney']\n *\n * // The `_.matches` iteratee shorthand.\n * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });\n * // => objects for ['barney', 'fred']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.dropRightWhile(users, ['active', false]);\n * // => objects for ['barney']\n *\n * // The `_.property` iteratee shorthand.\n * _.dropRightWhile(users, 'active');\n * // => objects for ['barney', 'fred', 'pebbles']\n */\n function dropRightWhile(array, predicate) {\n return (array && array.length)\n ? baseWhile(array, getIteratee(predicate, 3), true, true)\n : [];\n }\n\n /**\n * Creates a slice of `array` excluding elements dropped from the beginning.\n * Elements are dropped until `predicate` returns falsey. The predicate is\n * invoked with three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'active': false },\n * { 'user': 'fred', 'active': false },\n * { 'user': 'pebbles', 'active': true }\n * ];\n *\n * _.dropWhile(users, function(o) { return !o.active; });\n * // => objects for ['pebbles']\n *\n * // The `_.matches` iteratee shorthand.\n * _.dropWhile(users, { 'user': 'barney', 'active': false });\n * // => objects for ['fred', 'pebbles']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.dropWhile(users, ['active', false]);\n * // => objects for ['pebbles']\n *\n * // The `_.property` iteratee shorthand.\n * _.dropWhile(users, 'active');\n * // => objects for ['barney', 'fred', 'pebbles']\n */\n function dropWhile(array, predicate) {\n return (array && array.length)\n ? baseWhile(array, getIteratee(predicate, 3), true)\n : [];\n }\n\n /**\n * Fills elements of `array` with `value` from `start` up to, but not\n * including, `end`.\n *\n * **Note:** This method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 3.2.0\n * @category Array\n * @param {Array} array The array to fill.\n * @param {*} value The value to fill `array` with.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [1, 2, 3];\n *\n * _.fill(array, 'a');\n * console.log(array);\n * // => ['a', 'a', 'a']\n *\n * _.fill(Array(3), 2);\n * // => [2, 2, 2]\n *\n * _.fill([4, 6, 8, 10], '*', 1, 3);\n * // => [4, '*', '*', 10]\n */\n function fill(array, value, start, end) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return [];\n }\n if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {\n start = 0;\n end = length;\n }\n return baseFill(array, value, start, end);\n }\n\n /**\n * This method is like `_.find` except that it returns the index of the first\n * element `predicate` returns truthy for instead of the element itself.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @param {number} [fromIndex=0] The index to search from.\n * @returns {number} Returns the index of the found element, else `-1`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'active': false },\n * { 'user': 'fred', 'active': false },\n * { 'user': 'pebbles', 'active': true }\n * ];\n *\n * _.findIndex(users, function(o) { return o.user == 'barney'; });\n * // => 0\n *\n * // The `_.matches` iteratee shorthand.\n * _.findIndex(users, { 'user': 'fred', 'active': false });\n * // => 1\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findIndex(users, ['active', false]);\n * // => 0\n *\n * // The `_.property` iteratee shorthand.\n * _.findIndex(users, 'active');\n * // => 2\n */\n function findIndex(array, predicate, fromIndex) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return -1;\n }\n var index = fromIndex == null ? 0 : toInteger(fromIndex);\n if (index < 0) {\n index = nativeMax(length + index, 0);\n }\n return baseFindIndex(array, getIteratee(predicate, 3), index);\n }\n\n /**\n * This method is like `_.findIndex` except that it iterates over elements\n * of `collection` from right to left.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @param {number} [fromIndex=array.length-1] The index to search from.\n * @returns {number} Returns the index of the found element, else `-1`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'active': true },\n * { 'user': 'fred', 'active': false },\n * { 'user': 'pebbles', 'active': false }\n * ];\n *\n * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });\n * // => 2\n *\n * // The `_.matches` iteratee shorthand.\n * _.findLastIndex(users, { 'user': 'barney', 'active': true });\n * // => 0\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findLastIndex(users, ['active', false]);\n * // => 2\n *\n * // The `_.property` iteratee shorthand.\n * _.findLastIndex(users, 'active');\n * // => 0\n */\n function findLastIndex(array, predicate, fromIndex) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return -1;\n }\n var index = length - 1;\n if (fromIndex !== undefined) {\n index = toInteger(fromIndex);\n index = fromIndex < 0\n ? nativeMax(length + index, 0)\n : nativeMin(index, length - 1);\n }\n return baseFindIndex(array, getIteratee(predicate, 3), index, true);\n }\n\n /**\n * Flattens `array` a single level deep.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to flatten.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * _.flatten([1, [2, [3, [4]], 5]]);\n * // => [1, 2, [3, [4]], 5]\n */\n function flatten(array) {\n var length = array == null ? 0 : array.length;\n return length ? baseFlatten(array, 1) : [];\n }\n\n /**\n * Recursively flattens `array`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to flatten.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * _.flattenDeep([1, [2, [3, [4]], 5]]);\n * // => [1, 2, 3, 4, 5]\n */\n function flattenDeep(array) {\n var length = array == null ? 0 : array.length;\n return length ? baseFlatten(array, INFINITY) : [];\n }\n\n /**\n * Recursively flatten `array` up to `depth` times.\n *\n * @static\n * @memberOf _\n * @since 4.4.0\n * @category Array\n * @param {Array} array The array to flatten.\n * @param {number} [depth=1] The maximum recursion depth.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * var array = [1, [2, [3, [4]], 5]];\n *\n * _.flattenDepth(array, 1);\n * // => [1, 2, [3, [4]], 5]\n *\n * _.flattenDepth(array, 2);\n * // => [1, 2, 3, [4], 5]\n */\n function flattenDepth(array, depth) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return [];\n }\n depth = depth === undefined ? 1 : toInteger(depth);\n return baseFlatten(array, depth);\n }\n\n /**\n * The inverse of `_.toPairs`; this method returns an object composed\n * from key-value `pairs`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} pairs The key-value pairs.\n * @returns {Object} Returns the new object.\n * @example\n *\n * _.fromPairs([['a', 1], ['b', 2]]);\n * // => { 'a': 1, 'b': 2 }\n */\n function fromPairs(pairs) {\n var index = -1,\n length = pairs == null ? 0 : pairs.length,\n result = {};\n\n while (++index < length) {\n var pair = pairs[index];\n result[pair[0]] = pair[1];\n }\n return result;\n }\n\n /**\n * Gets the first element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @alias first\n * @category Array\n * @param {Array} array The array to query.\n * @returns {*} Returns the first element of `array`.\n * @example\n *\n * _.head([1, 2, 3]);\n * // => 1\n *\n * _.head([]);\n * // => undefined\n */\n function head(array) {\n return (array && array.length) ? array[0] : undefined;\n }\n\n /**\n * Gets the index at which the first occurrence of `value` is found in `array`\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons. If `fromIndex` is negative, it's used as the\n * offset from the end of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} [fromIndex=0] The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.indexOf([1, 2, 1, 2], 2);\n * // => 1\n *\n * // Search from the `fromIndex`.\n * _.indexOf([1, 2, 1, 2], 2, 2);\n * // => 3\n */\n function indexOf(array, value, fromIndex) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return -1;\n }\n var index = fromIndex == null ? 0 : toInteger(fromIndex);\n if (index < 0) {\n index = nativeMax(length + index, 0);\n }\n return baseIndexOf(array, value, index);\n }\n\n /**\n * Gets all but the last element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.initial([1, 2, 3]);\n * // => [1, 2]\n */\n function initial(array) {\n var length = array == null ? 0 : array.length;\n return length ? baseSlice(array, 0, -1) : [];\n }\n\n /**\n * Creates an array of unique values that are included in all given arrays\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons. The order and references of result values are\n * determined by the first array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @returns {Array} Returns the new array of intersecting values.\n * @example\n *\n * _.intersection([2, 1], [2, 3]);\n * // => [2]\n */\n var intersection = baseRest(function(arrays) {\n var mapped = arrayMap(arrays, castArrayLikeObject);\n return (mapped.length && mapped[0] === arrays[0])\n ? baseIntersection(mapped)\n : [];\n });\n\n /**\n * This method is like `_.intersection` except that it accepts `iteratee`\n * which is invoked for each element of each `arrays` to generate the criterion\n * by which they're compared. The order and references of result values are\n * determined by the first array. The iteratee is invoked with one argument:\n * (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Array} Returns the new array of intersecting values.\n * @example\n *\n * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);\n * // => [2.1]\n *\n * // The `_.property` iteratee shorthand.\n * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 1 }]\n */\n var intersectionBy = baseRest(function(arrays) {\n var iteratee = last(arrays),\n mapped = arrayMap(arrays, castArrayLikeObject);\n\n if (iteratee === last(mapped)) {\n iteratee = undefined;\n } else {\n mapped.pop();\n }\n return (mapped.length && mapped[0] === arrays[0])\n ? baseIntersection(mapped, getIteratee(iteratee, 2))\n : [];\n });\n\n /**\n * This method is like `_.intersection` except that it accepts `comparator`\n * which is invoked to compare elements of `arrays`. The order and references\n * of result values are determined by the first array. The comparator is\n * invoked with two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of intersecting values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.intersectionWith(objects, others, _.isEqual);\n * // => [{ 'x': 1, 'y': 2 }]\n */\n var intersectionWith = baseRest(function(arrays) {\n var comparator = last(arrays),\n mapped = arrayMap(arrays, castArrayLikeObject);\n\n comparator = typeof comparator == 'function' ? comparator : undefined;\n if (comparator) {\n mapped.pop();\n }\n return (mapped.length && mapped[0] === arrays[0])\n ? baseIntersection(mapped, undefined, comparator)\n : [];\n });\n\n /**\n * Converts all elements in `array` into a string separated by `separator`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to convert.\n * @param {string} [separator=','] The element separator.\n * @returns {string} Returns the joined string.\n * @example\n *\n * _.join(['a', 'b', 'c'], '~');\n * // => 'a~b~c'\n */\n function join(array, separator) {\n return array == null ? '' : nativeJoin.call(array, separator);\n }\n\n /**\n * Gets the last element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {*} Returns the last element of `array`.\n * @example\n *\n * _.last([1, 2, 3]);\n * // => 3\n */\n function last(array) {\n var length = array == null ? 0 : array.length;\n return length ? array[length - 1] : undefined;\n }\n\n /**\n * This method is like `_.indexOf` except that it iterates over elements of\n * `array` from right to left.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @param {number} [fromIndex=array.length-1] The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.lastIndexOf([1, 2, 1, 2], 2);\n * // => 3\n *\n * // Search from the `fromIndex`.\n * _.lastIndexOf([1, 2, 1, 2], 2, 2);\n * // => 1\n */\n function lastIndexOf(array, value, fromIndex) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return -1;\n }\n var index = length;\n if (fromIndex !== undefined) {\n index = toInteger(fromIndex);\n index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);\n }\n return value === value\n ? strictLastIndexOf(array, value, index)\n : baseFindIndex(array, baseIsNaN, index, true);\n }\n\n /**\n * Gets the element at index `n` of `array`. If `n` is negative, the nth\n * element from the end is returned.\n *\n * @static\n * @memberOf _\n * @since 4.11.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=0] The index of the element to return.\n * @returns {*} Returns the nth element of `array`.\n * @example\n *\n * var array = ['a', 'b', 'c', 'd'];\n *\n * _.nth(array, 1);\n * // => 'b'\n *\n * _.nth(array, -2);\n * // => 'c';\n */\n function nth(array, n) {\n return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;\n }\n\n /**\n * Removes all given values from `array` using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`\n * to remove elements from an array by predicate.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {...*} [values] The values to remove.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = ['a', 'b', 'c', 'a', 'b', 'c'];\n *\n * _.pull(array, 'a', 'c');\n * console.log(array);\n * // => ['b', 'b']\n */\n var pull = baseRest(pullAll);\n\n /**\n * This method is like `_.pull` except that it accepts an array of values to remove.\n *\n * **Note:** Unlike `_.difference`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = ['a', 'b', 'c', 'a', 'b', 'c'];\n *\n * _.pullAll(array, ['a', 'c']);\n * console.log(array);\n * // => ['b', 'b']\n */\n function pullAll(array, values) {\n return (array && array.length && values && values.length)\n ? basePullAll(array, values)\n : array;\n }\n\n /**\n * This method is like `_.pullAll` except that it accepts `iteratee` which is\n * invoked for each element of `array` and `values` to generate the criterion\n * by which they're compared. The iteratee is invoked with one argument: (value).\n *\n * **Note:** Unlike `_.differenceBy`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];\n *\n * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');\n * console.log(array);\n * // => [{ 'x': 2 }]\n */\n function pullAllBy(array, values, iteratee) {\n return (array && array.length && values && values.length)\n ? basePullAll(array, values, getIteratee(iteratee, 2))\n : array;\n }\n\n /**\n * This method is like `_.pullAll` except that it accepts `comparator` which\n * is invoked to compare elements of `array` to `values`. The comparator is\n * invoked with two arguments: (arrVal, othVal).\n *\n * **Note:** Unlike `_.differenceWith`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 4.6.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];\n *\n * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);\n * console.log(array);\n * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]\n */\n function pullAllWith(array, values, comparator) {\n return (array && array.length && values && values.length)\n ? basePullAll(array, values, undefined, comparator)\n : array;\n }\n\n /**\n * Removes elements from `array` corresponding to `indexes` and returns an\n * array of removed elements.\n *\n * **Note:** Unlike `_.at`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {...(number|number[])} [indexes] The indexes of elements to remove.\n * @returns {Array} Returns the new array of removed elements.\n * @example\n *\n * var array = ['a', 'b', 'c', 'd'];\n * var pulled = _.pullAt(array, [1, 3]);\n *\n * console.log(array);\n * // => ['a', 'c']\n *\n * console.log(pulled);\n * // => ['b', 'd']\n */\n var pullAt = flatRest(function(array, indexes) {\n var length = array == null ? 0 : array.length,\n result = baseAt(array, indexes);\n\n basePullAt(array, arrayMap(indexes, function(index) {\n return isIndex(index, length) ? +index : index;\n }).sort(compareAscending));\n\n return result;\n });\n\n /**\n * Removes all elements from `array` that `predicate` returns truthy for\n * and returns an array of the removed elements. The predicate is invoked\n * with three arguments: (value, index, array).\n *\n * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`\n * to pull elements from an array by value.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the new array of removed elements.\n * @example\n *\n * var array = [1, 2, 3, 4];\n * var evens = _.remove(array, function(n) {\n * return n % 2 == 0;\n * });\n *\n * console.log(array);\n * // => [1, 3]\n *\n * console.log(evens);\n * // => [2, 4]\n */\n function remove(array, predicate) {\n var result = [];\n if (!(array && array.length)) {\n return result;\n }\n var index = -1,\n indexes = [],\n length = array.length;\n\n predicate = getIteratee(predicate, 3);\n while (++index < length) {\n var value = array[index];\n if (predicate(value, index, array)) {\n result.push(value);\n indexes.push(index);\n }\n }\n basePullAt(array, indexes);\n return result;\n }\n\n /**\n * Reverses `array` so that the first element becomes the last, the second\n * element becomes the second to last, and so on.\n *\n * **Note:** This method mutates `array` and is based on\n * [`Array#reverse`](https://mdn.io/Array/reverse).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [1, 2, 3];\n *\n * _.reverse(array);\n * // => [3, 2, 1]\n *\n * console.log(array);\n * // => [3, 2, 1]\n */\n function reverse(array) {\n return array == null ? array : nativeReverse.call(array);\n }\n\n /**\n * Creates a slice of `array` from `start` up to, but not including, `end`.\n *\n * **Note:** This method is used instead of\n * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are\n * returned.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to slice.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns the slice of `array`.\n */\n function slice(array, start, end) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return [];\n }\n if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {\n start = 0;\n end = length;\n }\n else {\n start = start == null ? 0 : toInteger(start);\n end = end === undefined ? length : toInteger(end);\n }\n return baseSlice(array, start, end);\n }\n\n /**\n * Uses a binary search to determine the lowest index at which `value`\n * should be inserted into `array` in order to maintain its sort order.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @returns {number} Returns the index at which `value` should be inserted\n * into `array`.\n * @example\n *\n * _.sortedIndex([30, 50], 40);\n * // => 1\n */\n function sortedIndex(array, value) {\n return baseSortedIndex(array, value);\n }\n\n /**\n * This method is like `_.sortedIndex` except that it accepts `iteratee`\n * which is invoked for `value` and each element of `array` to compute their\n * sort ranking. The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {number} Returns the index at which `value` should be inserted\n * into `array`.\n * @example\n *\n * var objects = [{ 'x': 4 }, { 'x': 5 }];\n *\n * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });\n * // => 0\n *\n * // The `_.property` iteratee shorthand.\n * _.sortedIndexBy(objects, { 'x': 4 }, 'x');\n * // => 0\n */\n function sortedIndexBy(array, value, iteratee) {\n return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));\n }\n\n /**\n * This method is like `_.indexOf` except that it performs a binary\n * search on a sorted `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.sortedIndexOf([4, 5, 5, 5, 6], 5);\n * // => 1\n */\n function sortedIndexOf(array, value) {\n var length = array == null ? 0 : array.length;\n if (length) {\n var index = baseSortedIndex(array, value);\n if (index < length && eq(array[index], value)) {\n return index;\n }\n }\n return -1;\n }\n\n /**\n * This method is like `_.sortedIndex` except that it returns the highest\n * index at which `value` should be inserted into `array` in order to\n * maintain its sort order.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @returns {number} Returns the index at which `value` should be inserted\n * into `array`.\n * @example\n *\n * _.sortedLastIndex([4, 5, 5, 5, 6], 5);\n * // => 4\n */\n function sortedLastIndex(array, value) {\n return baseSortedIndex(array, value, true);\n }\n\n /**\n * This method is like `_.sortedLastIndex` except that it accepts `iteratee`\n * which is invoked for `value` and each element of `array` to compute their\n * sort ranking. The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {number} Returns the index at which `value` should be inserted\n * into `array`.\n * @example\n *\n * var objects = [{ 'x': 4 }, { 'x': 5 }];\n *\n * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });\n * // => 1\n *\n * // The `_.property` iteratee shorthand.\n * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');\n * // => 1\n */\n function sortedLastIndexBy(array, value, iteratee) {\n return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);\n }\n\n /**\n * This method is like `_.lastIndexOf` except that it performs a binary\n * search on a sorted `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {*} value The value to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);\n * // => 3\n */\n function sortedLastIndexOf(array, value) {\n var length = array == null ? 0 : array.length;\n if (length) {\n var index = baseSortedIndex(array, value, true) - 1;\n if (eq(array[index], value)) {\n return index;\n }\n }\n return -1;\n }\n\n /**\n * This method is like `_.uniq` except that it's designed and optimized\n * for sorted arrays.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.sortedUniq([1, 1, 2]);\n * // => [1, 2]\n */\n function sortedUniq(array) {\n return (array && array.length)\n ? baseSortedUniq(array)\n : [];\n }\n\n /**\n * This method is like `_.uniqBy` except that it's designed and optimized\n * for sorted arrays.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);\n * // => [1.1, 2.3]\n */\n function sortedUniqBy(array, iteratee) {\n return (array && array.length)\n ? baseSortedUniq(array, getIteratee(iteratee, 2))\n : [];\n }\n\n /**\n * Gets all but the first element of `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.tail([1, 2, 3]);\n * // => [2, 3]\n */\n function tail(array) {\n var length = array == null ? 0 : array.length;\n return length ? baseSlice(array, 1, length) : [];\n }\n\n /**\n * Creates a slice of `array` with `n` elements taken from the beginning.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to take.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.take([1, 2, 3]);\n * // => [1]\n *\n * _.take([1, 2, 3], 2);\n * // => [1, 2]\n *\n * _.take([1, 2, 3], 5);\n * // => [1, 2, 3]\n *\n * _.take([1, 2, 3], 0);\n * // => []\n */\n function take(array, n, guard) {\n if (!(array && array.length)) {\n return [];\n }\n n = (guard || n === undefined) ? 1 : toInteger(n);\n return baseSlice(array, 0, n < 0 ? 0 : n);\n }\n\n /**\n * Creates a slice of `array` with `n` elements taken from the end.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to take.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.takeRight([1, 2, 3]);\n * // => [3]\n *\n * _.takeRight([1, 2, 3], 2);\n * // => [2, 3]\n *\n * _.takeRight([1, 2, 3], 5);\n * // => [1, 2, 3]\n *\n * _.takeRight([1, 2, 3], 0);\n * // => []\n */\n function takeRight(array, n, guard) {\n var length = array == null ? 0 : array.length;\n if (!length) {\n return [];\n }\n n = (guard || n === undefined) ? 1 : toInteger(n);\n n = length - n;\n return baseSlice(array, n < 0 ? 0 : n, length);\n }\n\n /**\n * Creates a slice of `array` with elements taken from the end. Elements are\n * taken until `predicate` returns falsey. The predicate is invoked with\n * three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'active': true },\n * { 'user': 'fred', 'active': false },\n * { 'user': 'pebbles', 'active': false }\n * ];\n *\n * _.takeRightWhile(users, function(o) { return !o.active; });\n * // => objects for ['fred', 'pebbles']\n *\n * // The `_.matches` iteratee shorthand.\n * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });\n * // => objects for ['pebbles']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.takeRightWhile(users, ['active', false]);\n * // => objects for ['fred', 'pebbles']\n *\n * // The `_.property` iteratee shorthand.\n * _.takeRightWhile(users, 'active');\n * // => []\n */\n function takeRightWhile(array, predicate) {\n return (array && array.length)\n ? baseWhile(array, getIteratee(predicate, 3), false, true)\n : [];\n }\n\n /**\n * Creates a slice of `array` with elements taken from the beginning. Elements\n * are taken until `predicate` returns falsey. The predicate is invoked with\n * three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'active': false },\n * { 'user': 'fred', 'active': false },\n * { 'user': 'pebbles', 'active': true }\n * ];\n *\n * _.takeWhile(users, function(o) { return !o.active; });\n * // => objects for ['barney', 'fred']\n *\n * // The `_.matches` iteratee shorthand.\n * _.takeWhile(users, { 'user': 'barney', 'active': false });\n * // => objects for ['barney']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.takeWhile(users, ['active', false]);\n * // => objects for ['barney', 'fred']\n *\n * // The `_.property` iteratee shorthand.\n * _.takeWhile(users, 'active');\n * // => []\n */\n function takeWhile(array, predicate) {\n return (array && array.length)\n ? baseWhile(array, getIteratee(predicate, 3))\n : [];\n }\n\n /**\n * Creates an array of unique values, in order, from all given arrays using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @returns {Array} Returns the new array of combined values.\n * @example\n *\n * _.union([2], [1, 2]);\n * // => [2, 1]\n */\n var union = baseRest(function(arrays) {\n return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));\n });\n\n /**\n * This method is like `_.union` except that it accepts `iteratee` which is\n * invoked for each element of each `arrays` to generate the criterion by\n * which uniqueness is computed. Result values are chosen from the first\n * array in which the value occurs. The iteratee is invoked with one argument:\n * (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Array} Returns the new array of combined values.\n * @example\n *\n * _.unionBy([2.1], [1.2, 2.3], Math.floor);\n * // => [2.1, 1.2]\n *\n * // The `_.property` iteratee shorthand.\n * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 1 }, { 'x': 2 }]\n */\n var unionBy = baseRest(function(arrays) {\n var iteratee = last(arrays);\n if (isArrayLikeObject(iteratee)) {\n iteratee = undefined;\n }\n return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));\n });\n\n /**\n * This method is like `_.union` except that it accepts `comparator` which\n * is invoked to compare elements of `arrays`. Result values are chosen from\n * the first array in which the value occurs. The comparator is invoked\n * with two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of combined values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.unionWith(objects, others, _.isEqual);\n * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]\n */\n var unionWith = baseRest(function(arrays) {\n var comparator = last(arrays);\n comparator = typeof comparator == 'function' ? comparator : undefined;\n return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);\n });\n\n /**\n * Creates a duplicate-free version of an array, using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons, in which only the first occurrence of each element\n * is kept. The order of result values is determined by the order they occur\n * in the array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.uniq([2, 1, 2]);\n * // => [2, 1]\n */\n function uniq(array) {\n return (array && array.length) ? baseUniq(array) : [];\n }\n\n /**\n * This method is like `_.uniq` except that it accepts `iteratee` which is\n * invoked for each element in `array` to generate the criterion by which\n * uniqueness is computed. The order of result values is determined by the\n * order they occur in the array. The iteratee is invoked with one argument:\n * (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.uniqBy([2.1, 1.2, 2.3], Math.floor);\n * // => [2.1, 1.2]\n *\n * // The `_.property` iteratee shorthand.\n * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 1 }, { 'x': 2 }]\n */\n function uniqBy(array, iteratee) {\n return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];\n }\n\n /**\n * This method is like `_.uniq` except that it accepts `comparator` which\n * is invoked to compare elements of `array`. The order of result values is\n * determined by the order they occur in the array.The comparator is invoked\n * with two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.uniqWith(objects, _.isEqual);\n * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]\n */\n function uniqWith(array, comparator) {\n comparator = typeof comparator == 'function' ? comparator : undefined;\n return (array && array.length) ? baseUniq(array, undefined, comparator) : [];\n }\n\n /**\n * This method is like `_.zip` except that it accepts an array of grouped\n * elements and creates an array regrouping the elements to their pre-zip\n * configuration.\n *\n * @static\n * @memberOf _\n * @since 1.2.0\n * @category Array\n * @param {Array} array The array of grouped elements to process.\n * @returns {Array} Returns the new array of regrouped elements.\n * @example\n *\n * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);\n * // => [['a', 1, true], ['b', 2, false]]\n *\n * _.unzip(zipped);\n * // => [['a', 'b'], [1, 2], [true, false]]\n */\n function unzip(array) {\n if (!(array && array.length)) {\n return [];\n }\n var length = 0;\n array = arrayFilter(array, function(group) {\n if (isArrayLikeObject(group)) {\n length = nativeMax(group.length, length);\n return true;\n }\n });\n return baseTimes(length, function(index) {\n return arrayMap(array, baseProperty(index));\n });\n }\n\n /**\n * This method is like `_.unzip` except that it accepts `iteratee` to specify\n * how regrouped values should be combined. The iteratee is invoked with the\n * elements of each group: (...group).\n *\n * @static\n * @memberOf _\n * @since 3.8.0\n * @category Array\n * @param {Array} array The array of grouped elements to process.\n * @param {Function} [iteratee=_.identity] The function to combine\n * regrouped values.\n * @returns {Array} Returns the new array of regrouped elements.\n * @example\n *\n * var zipped = _.zip([1, 2], [10, 20], [100, 200]);\n * // => [[1, 10, 100], [2, 20, 200]]\n *\n * _.unzipWith(zipped, _.add);\n * // => [3, 30, 300]\n */\n function unzipWith(array, iteratee) {\n if (!(array && array.length)) {\n return [];\n }\n var result = unzip(array);\n if (iteratee == null) {\n return result;\n }\n return arrayMap(result, function(group) {\n return apply(iteratee, undefined, group);\n });\n }\n\n /**\n * Creates an array excluding all given values using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * **Note:** Unlike `_.pull`, this method returns a new array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...*} [values] The values to exclude.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.difference, _.xor\n * @example\n *\n * _.without([2, 1, 2, 3], 1, 2);\n * // => [3]\n */\n var without = baseRest(function(array, values) {\n return isArrayLikeObject(array)\n ? baseDifference(array, values)\n : [];\n });\n\n /**\n * Creates an array of unique values that is the\n * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)\n * of the given arrays. The order of result values is determined by the order\n * they occur in the arrays.\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.difference, _.without\n * @example\n *\n * _.xor([2, 1], [2, 3]);\n * // => [1, 3]\n */\n var xor = baseRest(function(arrays) {\n return baseXor(arrayFilter(arrays, isArrayLikeObject));\n });\n\n /**\n * This method is like `_.xor` except that it accepts `iteratee` which is\n * invoked for each element of each `arrays` to generate the criterion by\n * which by which they're compared. The order of result values is determined\n * by the order they occur in the arrays. The iteratee is invoked with one\n * argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);\n * // => [1.2, 3.4]\n *\n * // The `_.property` iteratee shorthand.\n * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 2 }]\n */\n var xorBy = baseRest(function(arrays) {\n var iteratee = last(arrays);\n if (isArrayLikeObject(iteratee)) {\n iteratee = undefined;\n }\n return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));\n });\n\n /**\n * This method is like `_.xor` except that it accepts `comparator` which is\n * invoked to compare elements of `arrays`. The order of result values is\n * determined by the order they occur in the arrays. The comparator is invoked\n * with two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.xorWith(objects, others, _.isEqual);\n * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]\n */\n var xorWith = baseRest(function(arrays) {\n var comparator = last(arrays);\n comparator = typeof comparator == 'function' ? comparator : undefined;\n return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);\n });\n\n /**\n * Creates an array of grouped elements, the first of which contains the\n * first elements of the given arrays, the second of which contains the\n * second elements of the given arrays, and so on.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {...Array} [arrays] The arrays to process.\n * @returns {Array} Returns the new array of grouped elements.\n * @example\n *\n * _.zip(['a', 'b'], [1, 2], [true, false]);\n * // => [['a', 1, true], ['b', 2, false]]\n */\n var zip = baseRest(unzip);\n\n /**\n * This method is like `_.fromPairs` except that it accepts two arrays,\n * one of property identifiers and one of corresponding values.\n *\n * @static\n * @memberOf _\n * @since 0.4.0\n * @category Array\n * @param {Array} [props=[]] The property identifiers.\n * @param {Array} [values=[]] The property values.\n * @returns {Object} Returns the new object.\n * @example\n *\n * _.zipObject(['a', 'b'], [1, 2]);\n * // => { 'a': 1, 'b': 2 }\n */\n function zipObject(props, values) {\n return baseZipObject(props || [], values || [], assignValue);\n }\n\n /**\n * This method is like `_.zipObject` except that it supports property paths.\n *\n * @static\n * @memberOf _\n * @since 4.1.0\n * @category Array\n * @param {Array} [props=[]] The property identifiers.\n * @param {Array} [values=[]] The property values.\n * @returns {Object} Returns the new object.\n * @example\n *\n * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);\n * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }\n */\n function zipObjectDeep(props, values) {\n return baseZipObject(props || [], values || [], baseSet);\n }\n\n /**\n * This method is like `_.zip` except that it accepts `iteratee` to specify\n * how grouped values should be combined. The iteratee is invoked with the\n * elements of each group: (...group).\n *\n * @static\n * @memberOf _\n * @since 3.8.0\n * @category Array\n * @param {...Array} [arrays] The arrays to process.\n * @param {Function} [iteratee=_.identity] The function to combine\n * grouped values.\n * @returns {Array} Returns the new array of grouped elements.\n * @example\n *\n * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {\n * return a + b + c;\n * });\n * // => [111, 222]\n */\n var zipWith = baseRest(function(arrays) {\n var length = arrays.length,\n iteratee = length > 1 ? arrays[length - 1] : undefined;\n\n iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;\n return unzipWith(arrays, iteratee);\n });\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates a `lodash` wrapper instance that wraps `value` with explicit method\n * chain sequences enabled. The result of such sequences must be unwrapped\n * with `_#value`.\n *\n * @static\n * @memberOf _\n * @since 1.3.0\n * @category Seq\n * @param {*} value The value to wrap.\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'age': 36 },\n * { 'user': 'fred', 'age': 40 },\n * { 'user': 'pebbles', 'age': 1 }\n * ];\n *\n * var youngest = _\n * .chain(users)\n * .sortBy('age')\n * .map(function(o) {\n * return o.user + ' is ' + o.age;\n * })\n * .head()\n * .value();\n * // => 'pebbles is 1'\n */\n function chain(value) {\n var result = lodash(value);\n result.__chain__ = true;\n return result;\n }\n\n /**\n * This method invokes `interceptor` and returns `value`. The interceptor\n * is invoked with one argument; (value). The purpose of this method is to\n * \"tap into\" a method chain sequence in order to modify intermediate results.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Seq\n * @param {*} value The value to provide to `interceptor`.\n * @param {Function} interceptor The function to invoke.\n * @returns {*} Returns `value`.\n * @example\n *\n * _([1, 2, 3])\n * .tap(function(array) {\n * // Mutate input array.\n * array.pop();\n * })\n * .reverse()\n * .value();\n * // => [2, 1]\n */\n function tap(value, interceptor) {\n interceptor(value);\n return value;\n }\n\n /**\n * This method is like `_.tap` except that it returns the result of `interceptor`.\n * The purpose of this method is to \"pass thru\" values replacing intermediate\n * results in a method chain sequence.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Seq\n * @param {*} value The value to provide to `interceptor`.\n * @param {Function} interceptor The function to invoke.\n * @returns {*} Returns the result of `interceptor`.\n * @example\n *\n * _(' abc ')\n * .chain()\n * .trim()\n * .thru(function(value) {\n * return [value];\n * })\n * .value();\n * // => ['abc']\n */\n function thru(value, interceptor) {\n return interceptor(value);\n }\n\n /**\n * This method is the wrapper version of `_.at`.\n *\n * @name at\n * @memberOf _\n * @since 1.0.0\n * @category Seq\n * @param {...(string|string[])} [paths] The property paths to pick.\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };\n *\n * _(object).at(['a[0].b.c', 'a[1]']).value();\n * // => [3, 4]\n */\n var wrapperAt = flatRest(function(paths) {\n var length = paths.length,\n start = length ? paths[0] : 0,\n value = this.__wrapped__,\n interceptor = function(object) { return baseAt(object, paths); };\n\n if (length > 1 || this.__actions__.length ||\n !(value instanceof LazyWrapper) || !isIndex(start)) {\n return this.thru(interceptor);\n }\n value = value.slice(start, +start + (length ? 1 : 0));\n value.__actions__.push({\n 'func': thru,\n 'args': [interceptor],\n 'thisArg': undefined\n });\n return new LodashWrapper(value, this.__chain__).thru(function(array) {\n if (length && !array.length) {\n array.push(undefined);\n }\n return array;\n });\n });\n\n /**\n * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.\n *\n * @name chain\n * @memberOf _\n * @since 0.1.0\n * @category Seq\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'age': 36 },\n * { 'user': 'fred', 'age': 40 }\n * ];\n *\n * // A sequence without explicit chaining.\n * _(users).head();\n * // => { 'user': 'barney', 'age': 36 }\n *\n * // A sequence with explicit chaining.\n * _(users)\n * .chain()\n * .head()\n * .pick('user')\n * .value();\n * // => { 'user': 'barney' }\n */\n function wrapperChain() {\n return chain(this);\n }\n\n /**\n * Executes the chain sequence and returns the wrapped result.\n *\n * @name commit\n * @memberOf _\n * @since 3.2.0\n * @category Seq\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * var array = [1, 2];\n * var wrapped = _(array).push(3);\n *\n * console.log(array);\n * // => [1, 2]\n *\n * wrapped = wrapped.commit();\n * console.log(array);\n * // => [1, 2, 3]\n *\n * wrapped.last();\n * // => 3\n *\n * console.log(array);\n * // => [1, 2, 3]\n */\n function wrapperCommit() {\n return new LodashWrapper(this.value(), this.__chain__);\n }\n\n /**\n * Gets the next value on a wrapped object following the\n * [iterator protocol](https://mdn.io/iteration_protocols#iterator).\n *\n * @name next\n * @memberOf _\n * @since 4.0.0\n * @category Seq\n * @returns {Object} Returns the next iterator value.\n * @example\n *\n * var wrapped = _([1, 2]);\n *\n * wrapped.next();\n * // => { 'done': false, 'value': 1 }\n *\n * wrapped.next();\n * // => { 'done': false, 'value': 2 }\n *\n * wrapped.next();\n * // => { 'done': true, 'value': undefined }\n */\n function wrapperNext() {\n if (this.__values__ === undefined) {\n this.__values__ = toArray(this.value());\n }\n var done = this.__index__ >= this.__values__.length,\n value = done ? undefined : this.__values__[this.__index__++];\n\n return { 'done': done, 'value': value };\n }\n\n /**\n * Enables the wrapper to be iterable.\n *\n * @name Symbol.iterator\n * @memberOf _\n * @since 4.0.0\n * @category Seq\n * @returns {Object} Returns the wrapper object.\n * @example\n *\n * var wrapped = _([1, 2]);\n *\n * wrapped[Symbol.iterator]() === wrapped;\n * // => true\n *\n * Array.from(wrapped);\n * // => [1, 2]\n */\n function wrapperToIterator() {\n return this;\n }\n\n /**\n * Creates a clone of the chain sequence planting `value` as the wrapped value.\n *\n * @name plant\n * @memberOf _\n * @since 3.2.0\n * @category Seq\n * @param {*} value The value to plant.\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * function square(n) {\n * return n * n;\n * }\n *\n * var wrapped = _([1, 2]).map(square);\n * var other = wrapped.plant([3, 4]);\n *\n * other.value();\n * // => [9, 16]\n *\n * wrapped.value();\n * // => [1, 4]\n */\n function wrapperPlant(value) {\n var result,\n parent = this;\n\n while (parent instanceof baseLodash) {\n var clone = wrapperClone(parent);\n clone.__index__ = 0;\n clone.__values__ = undefined;\n if (result) {\n previous.__wrapped__ = clone;\n } else {\n result = clone;\n }\n var previous = clone;\n parent = parent.__wrapped__;\n }\n previous.__wrapped__ = value;\n return result;\n }\n\n /**\n * This method is the wrapper version of `_.reverse`.\n *\n * **Note:** This method mutates the wrapped array.\n *\n * @name reverse\n * @memberOf _\n * @since 0.1.0\n * @category Seq\n * @returns {Object} Returns the new `lodash` wrapper instance.\n * @example\n *\n * var array = [1, 2, 3];\n *\n * _(array).reverse().value()\n * // => [3, 2, 1]\n *\n * console.log(array);\n * // => [3, 2, 1]\n */\n function wrapperReverse() {\n var value = this.__wrapped__;\n if (value instanceof LazyWrapper) {\n var wrapped = value;\n if (this.__actions__.length) {\n wrapped = new LazyWrapper(this);\n }\n wrapped = wrapped.reverse();\n wrapped.__actions__.push({\n 'func': thru,\n 'args': [reverse],\n 'thisArg': undefined\n });\n return new LodashWrapper(wrapped, this.__chain__);\n }\n return this.thru(reverse);\n }\n\n /**\n * Executes the chain sequence to resolve the unwrapped value.\n *\n * @name value\n * @memberOf _\n * @since 0.1.0\n * @alias toJSON, valueOf\n * @category Seq\n * @returns {*} Returns the resolved unwrapped value.\n * @example\n *\n * _([1, 2, 3]).value();\n * // => [1, 2, 3]\n */\n function wrapperValue() {\n return baseWrapperValue(this.__wrapped__, this.__actions__);\n }\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Creates an object composed of keys generated from the results of running\n * each element of `collection` thru `iteratee`. The corresponding value of\n * each key is the number of times the key was returned by `iteratee`. The\n * iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 0.5.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The iteratee to transform keys.\n * @returns {Object} Returns the composed aggregate object.\n * @example\n *\n * _.countBy([6.1, 4.2, 6.3], Math.floor);\n * // => { '4': 1, '6': 2 }\n *\n * // The `_.property` iteratee shorthand.\n * _.countBy(['one', 'two', 'three'], 'length');\n * // => { '3': 2, '5': 1 }\n */\n var countBy = createAggregator(function(result, value, key) {\n if (hasOwnProperty.call(result, key)) {\n ++result[key];\n } else {\n baseAssignValue(result, key, 1);\n }\n });\n\n /**\n * Checks if `predicate` returns truthy for **all** elements of `collection`.\n * Iteration is stopped once `predicate` returns falsey. The predicate is\n * invoked with three arguments: (value, index|key, collection).\n *\n * **Note:** This method returns `true` for\n * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because\n * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of\n * elements of empty collections.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {boolean} Returns `true` if all elements pass the predicate check,\n * else `false`.\n * @example\n *\n * _.every([true, 1, null, 'yes'], Boolean);\n * // => false\n *\n * var users = [\n * { 'user': 'barney', 'age': 36, 'active': false },\n * { 'user': 'fred', 'age': 40, 'active': false }\n * ];\n *\n * // The `_.matches` iteratee shorthand.\n * _.every(users, { 'user': 'barney', 'active': false });\n * // => false\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.every(users, ['active', false]);\n * // => true\n *\n * // The `_.property` iteratee shorthand.\n * _.every(users, 'active');\n * // => false\n */\n function every(collection, predicate, guard) {\n var func = isArray(collection) ? arrayEvery : baseEvery;\n if (guard && isIterateeCall(collection, predicate, guard)) {\n predicate = undefined;\n }\n return func(collection, getIteratee(predicate, 3));\n }\n\n /**\n * Iterates over elements of `collection`, returning an array of all elements\n * `predicate` returns truthy for. The predicate is invoked with three\n * arguments: (value, index|key, collection).\n *\n * **Note:** Unlike `_.remove`, this method returns a new array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n * @see _.reject\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'age': 36, 'active': true },\n * { 'user': 'fred', 'age': 40, 'active': false }\n * ];\n *\n * _.filter(users, function(o) { return !o.active; });\n * // => objects for ['fred']\n *\n * // The `_.matches` iteratee shorthand.\n * _.filter(users, { 'age': 36, 'active': true });\n * // => objects for ['barney']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.filter(users, ['active', false]);\n * // => objects for ['fred']\n *\n * // The `_.property` iteratee shorthand.\n * _.filter(users, 'active');\n * // => objects for ['barney']\n *\n * // Combining several predicates using `_.overEvery` or `_.overSome`.\n * _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));\n * // => objects for ['fred', 'barney']\n */\n function filter(collection, predicate) {\n var func = isArray(collection) ? arrayFilter : baseFilter;\n return func(collection, getIteratee(predicate, 3));\n }\n\n /**\n * Iterates over elements of `collection`, returning the first element\n * `predicate` returns truthy for. The predicate is invoked with three\n * arguments: (value, index|key, collection).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @param {number} [fromIndex=0] The index to search from.\n * @returns {*} Returns the matched element, else `undefined`.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'age': 36, 'active': true },\n * { 'user': 'fred', 'age': 40, 'active': false },\n * { 'user': 'pebbles', 'age': 1, 'active': true }\n * ];\n *\n * _.find(users, function(o) { return o.age < 40; });\n * // => object for 'barney'\n *\n * // The `_.matches` iteratee shorthand.\n * _.find(users, { 'age': 1, 'active': true });\n * // => object for 'pebbles'\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.find(users, ['active', false]);\n * // => object for 'fred'\n *\n * // The `_.property` iteratee shorthand.\n * _.find(users, 'active');\n * // => object for 'barney'\n */\n var find = createFind(findIndex);\n\n /**\n * This method is like `_.find` except that it iterates over elements of\n * `collection` from right to left.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @param {number} [fromIndex=collection.length-1] The index to search from.\n * @returns {*} Returns the matched element, else `undefined`.\n * @example\n *\n * _.findLast([1, 2, 3, 4], function(n) {\n * return n % 2 == 1;\n * });\n * // => 3\n */\n var findLast = createFind(findLastIndex);\n\n /**\n * Creates a flattened array of values by running each element in `collection`\n * thru `iteratee` and flattening the mapped results. The iteratee is invoked\n * with three arguments: (value, index|key, collection).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * function duplicate(n) {\n * return [n, n];\n * }\n *\n * _.flatMap([1, 2], duplicate);\n * // => [1, 1, 2, 2]\n */\n function flatMap(collection, iteratee) {\n return baseFlatten(map(collection, iteratee), 1);\n }\n\n /**\n * This method is like `_.flatMap` except that it recursively flattens the\n * mapped results.\n *\n * @static\n * @memberOf _\n * @since 4.7.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * function duplicate(n) {\n * return [[[n, n]]];\n * }\n *\n * _.flatMapDeep([1, 2], duplicate);\n * // => [1, 1, 2, 2]\n */\n function flatMapDeep(collection, iteratee) {\n return baseFlatten(map(collection, iteratee), INFINITY);\n }\n\n /**\n * This method is like `_.flatMap` except that it recursively flattens the\n * mapped results up to `depth` times.\n *\n * @static\n * @memberOf _\n * @since 4.7.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @param {number} [depth=1] The maximum recursion depth.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * function duplicate(n) {\n * return [[[n, n]]];\n * }\n *\n * _.flatMapDepth([1, 2], duplicate, 2);\n * // => [[1, 1], [2, 2]]\n */\n function flatMapDepth(collection, iteratee, depth) {\n depth = depth === undefined ? 1 : toInteger(depth);\n return baseFlatten(map(collection, iteratee), depth);\n }\n\n /**\n * Iterates over elements of `collection` and invokes `iteratee` for each element.\n * The iteratee is invoked with three arguments: (value, index|key, collection).\n * Iteratee functions may exit iteration early by explicitly returning `false`.\n *\n * **Note:** As with other \"Collections\" methods, objects with a \"length\"\n * property are iterated like arrays. To avoid this behavior use `_.forIn`\n * or `_.forOwn` for object iteration.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @alias each\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Array|Object} Returns `collection`.\n * @see _.forEachRight\n * @example\n *\n * _.forEach([1, 2], function(value) {\n * console.log(value);\n * });\n * // => Logs `1` then `2`.\n *\n * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'a' then 'b' (iteration order is not guaranteed).\n */\n function forEach(collection, iteratee) {\n var func = isArray(collection) ? arrayEach : baseEach;\n return func(collection, getIteratee(iteratee, 3));\n }\n\n /**\n * This method is like `_.forEach` except that it iterates over elements of\n * `collection` from right to left.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @alias eachRight\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Array|Object} Returns `collection`.\n * @see _.forEach\n * @example\n *\n * _.forEachRight([1, 2], function(value) {\n * console.log(value);\n * });\n * // => Logs `2` then `1`.\n */\n function forEachRight(collection, iteratee) {\n var func = isArray(collection) ? arrayEachRight : baseEachRight;\n return func(collection, getIteratee(iteratee, 3));\n }\n\n /**\n * Creates an object composed of keys generated from the results of running\n * each element of `collection` thru `iteratee`. The order of grouped values\n * is determined by the order they occur in `collection`. The corresponding\n * value of each key is an array of elements responsible for generating the\n * key. The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The iteratee to transform keys.\n * @returns {Object} Returns the composed aggregate object.\n * @example\n *\n * _.groupBy([6.1, 4.2, 6.3], Math.floor);\n * // => { '4': [4.2], '6': [6.1, 6.3] }\n *\n * // The `_.property` iteratee shorthand.\n * _.groupBy(['one', 'two', 'three'], 'length');\n * // => { '3': ['one', 'two'], '5': ['three'] }\n */\n var groupBy = createAggregator(function(result, value, key) {\n if (hasOwnProperty.call(result, key)) {\n result[key].push(value);\n } else {\n baseAssignValue(result, key, [value]);\n }\n });\n\n /**\n * Checks if `value` is in `collection`. If `collection` is a string, it's\n * checked for a substring of `value`, otherwise\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * is used for equality comparisons. If `fromIndex` is negative, it's used as\n * the offset from the end of `collection`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object|string} collection The collection to inspect.\n * @param {*} value The value to search for.\n * @param {number} [fromIndex=0] The index to search from.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.\n * @returns {boolean} Returns `true` if `value` is found, else `false`.\n * @example\n *\n * _.includes([1, 2, 3], 1);\n * // => true\n *\n * _.includes([1, 2, 3], 1, 2);\n * // => false\n *\n * _.includes({ 'a': 1, 'b': 2 }, 1);\n * // => true\n *\n * _.includes('abcd', 'bc');\n * // => true\n */\n function includes(collection, value, fromIndex, guard) {\n collection = isArrayLike(collection) ? collection : values(collection);\n fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;\n\n var length = collection.length;\n if (fromIndex < 0) {\n fromIndex = nativeMax(length + fromIndex, 0);\n }\n return isString(collection)\n ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)\n : (!!length && baseIndexOf(collection, value, fromIndex) > -1);\n }\n\n /**\n * Invokes the method at `path` of each element in `collection`, returning\n * an array of the results of each invoked method. Any additional arguments\n * are provided to each invoked method. If `path` is a function, it's invoked\n * for, and `this` bound to, each element in `collection`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Array|Function|string} path The path of the method to invoke or\n * the function invoked per iteration.\n * @param {...*} [args] The arguments to invoke each method with.\n * @returns {Array} Returns the array of results.\n * @example\n *\n * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');\n * // => [[1, 5, 7], [1, 2, 3]]\n *\n * _.invokeMap([123, 456], String.prototype.split, '');\n * // => [['1', '2', '3'], ['4', '5', '6']]\n */\n var invokeMap = baseRest(function(collection, path, args) {\n var index = -1,\n isFunc = typeof path == 'function',\n result = isArrayLike(collection) ? Array(collection.length) : [];\n\n baseEach(collection, function(value) {\n result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);\n });\n return result;\n });\n\n /**\n * Creates an object composed of keys generated from the results of running\n * each element of `collection` thru `iteratee`. The corresponding value of\n * each key is the last element responsible for generating the key. The\n * iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The iteratee to transform keys.\n * @returns {Object} Returns the composed aggregate object.\n * @example\n *\n * var array = [\n * { 'dir': 'left', 'code': 97 },\n * { 'dir': 'right', 'code': 100 }\n * ];\n *\n * _.keyBy(array, function(o) {\n * return String.fromCharCode(o.code);\n * });\n * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }\n *\n * _.keyBy(array, 'dir');\n * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }\n */\n var keyBy = createAggregator(function(result, value, key) {\n baseAssignValue(result, key, value);\n });\n\n /**\n * Creates an array of values by running each element in `collection` thru\n * `iteratee`. The iteratee is invoked with three arguments:\n * (value, index|key, collection).\n *\n * Many lodash methods are guarded to work as iteratees for methods like\n * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.\n *\n * The guarded methods are:\n * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,\n * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,\n * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,\n * `template`, `trim`, `trimEnd`, `trimStart`, and `words`\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the new mapped array.\n * @example\n *\n * function square(n) {\n * return n * n;\n * }\n *\n * _.map([4, 8], square);\n * // => [16, 64]\n *\n * _.map({ 'a': 4, 'b': 8 }, square);\n * // => [16, 64] (iteration order is not guaranteed)\n *\n * var users = [\n * { 'user': 'barney' },\n * { 'user': 'fred' }\n * ];\n *\n * // The `_.property` iteratee shorthand.\n * _.map(users, 'user');\n * // => ['barney', 'fred']\n */\n function map(collection, iteratee) {\n var func = isArray(collection) ? arrayMap : baseMap;\n return func(collection, getIteratee(iteratee, 3));\n }\n\n /**\n * This method is like `_.sortBy` except that it allows specifying the sort\n * orders of the iteratees to sort by. If `orders` is unspecified, all values\n * are sorted in ascending order. Otherwise, specify an order of \"desc\" for\n * descending or \"asc\" for ascending sort order of corresponding values.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]\n * The iteratees to sort by.\n * @param {string[]} [orders] The sort orders of `iteratees`.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.\n * @returns {Array} Returns the new sorted array.\n * @example\n *\n * var users = [\n * { 'user': 'fred', 'age': 48 },\n * { 'user': 'barney', 'age': 34 },\n * { 'user': 'fred', 'age': 40 },\n * { 'user': 'barney', 'age': 36 }\n * ];\n *\n * // Sort by `user` in ascending order and by `age` in descending order.\n * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);\n * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]\n */\n function orderBy(collection, iteratees, orders, guard) {\n if (collection == null) {\n return [];\n }\n if (!isArray(iteratees)) {\n iteratees = iteratees == null ? [] : [iteratees];\n }\n orders = guard ? undefined : orders;\n if (!isArray(orders)) {\n orders = orders == null ? [] : [orders];\n }\n return baseOrderBy(collection, iteratees, orders);\n }\n\n /**\n * Creates an array of elements split into two groups, the first of which\n * contains elements `predicate` returns truthy for, the second of which\n * contains elements `predicate` returns falsey for. The predicate is\n * invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the array of grouped elements.\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'age': 36, 'active': false },\n * { 'user': 'fred', 'age': 40, 'active': true },\n * { 'user': 'pebbles', 'age': 1, 'active': false }\n * ];\n *\n * _.partition(users, function(o) { return o.active; });\n * // => objects for [['fred'], ['barney', 'pebbles']]\n *\n * // The `_.matches` iteratee shorthand.\n * _.partition(users, { 'age': 1, 'active': false });\n * // => objects for [['pebbles'], ['barney', 'fred']]\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.partition(users, ['active', false]);\n * // => objects for [['barney', 'pebbles'], ['fred']]\n *\n * // The `_.property` iteratee shorthand.\n * _.partition(users, 'active');\n * // => objects for [['fred'], ['barney', 'pebbles']]\n */\n var partition = createAggregator(function(result, value, key) {\n result[key ? 0 : 1].push(value);\n }, function() { return [[], []]; });\n\n /**\n * Reduces `collection` to a value which is the accumulated result of running\n * each element in `collection` thru `iteratee`, where each successive\n * invocation is supplied the return value of the previous. If `accumulator`\n * is not given, the first element of `collection` is used as the initial\n * value. The iteratee is invoked with four arguments:\n * (accumulator, value, index|key, collection).\n *\n * Many lodash methods are guarded to work as iteratees for methods like\n * `_.reduce`, `_.reduceRight`, and `_.transform`.\n *\n * The guarded methods are:\n * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,\n * and `sortBy`\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @param {*} [accumulator] The initial value.\n * @returns {*} Returns the accumulated value.\n * @see _.reduceRight\n * @example\n *\n * _.reduce([1, 2], function(sum, n) {\n * return sum + n;\n * }, 0);\n * // => 3\n *\n * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {\n * (result[value] || (result[value] = [])).push(key);\n * return result;\n * }, {});\n * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)\n */\n function reduce(collection, iteratee, accumulator) {\n var func = isArray(collection) ? arrayReduce : baseReduce,\n initAccum = arguments.length < 3;\n\n return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);\n }\n\n /**\n * This method is like `_.reduce` except that it iterates over elements of\n * `collection` from right to left.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @param {*} [accumulator] The initial value.\n * @returns {*} Returns the accumulated value.\n * @see _.reduce\n * @example\n *\n * var array = [[0, 1], [2, 3], [4, 5]];\n *\n * _.reduceRight(array, function(flattened, other) {\n * return flattened.concat(other);\n * }, []);\n * // => [4, 5, 2, 3, 0, 1]\n */\n function reduceRight(collection, iteratee, accumulator) {\n var func = isArray(collection) ? arrayReduceRight : baseReduce,\n initAccum = arguments.length < 3;\n\n return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);\n }\n\n /**\n * The opposite of `_.filter`; this method returns the elements of `collection`\n * that `predicate` does **not** return truthy for.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n * @see _.filter\n * @example\n *\n * var users = [\n * { 'user': 'barney', 'age': 36, 'active': false },\n * { 'user': 'fred', 'age': 40, 'active': true }\n * ];\n *\n * _.reject(users, function(o) { return !o.active; });\n * // => objects for ['fred']\n *\n * // The `_.matches` iteratee shorthand.\n * _.reject(users, { 'age': 40, 'active': true });\n * // => objects for ['barney']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.reject(users, ['active', false]);\n * // => objects for ['fred']\n *\n * // The `_.property` iteratee shorthand.\n * _.reject(users, 'active');\n * // => objects for ['barney']\n */\n function reject(collection, predicate) {\n var func = isArray(collection) ? arrayFilter : baseFilter;\n return func(collection, negate(getIteratee(predicate, 3)));\n }\n\n /**\n * Gets a random element from `collection`.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to sample.\n * @returns {*} Returns the random element.\n * @example\n *\n * _.sample([1, 2, 3, 4]);\n * // => 2\n */\n function sample(collection) {\n var func = isArray(collection) ? arraySample : baseSample;\n return func(collection);\n }\n\n /**\n * Gets `n` random elements at unique keys from `collection` up to the\n * size of `collection`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Collection\n * @param {Array|Object} collection The collection to sample.\n * @param {number} [n=1] The number of elements to sample.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the random elements.\n * @example\n *\n * _.sampleSize([1, 2, 3], 2);\n * // => [3, 1]\n *\n * _.sampleSize([1, 2, 3], 4);\n * // => [2, 3, 1]\n */\n function sampleSize(collection, n, guard) {\n if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {\n n = 1;\n } else {\n n = toInteger(n);\n }\n var func = isArray(collection) ? arraySampleSize : baseSampleSize;\n return func(collection, n);\n }\n\n /**\n * Creates an array of shuffled values, using a version of the\n * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to shuffle.\n * @returns {Array} Returns the new shuffled array.\n * @example\n *\n * _.shuffle([1, 2, 3, 4]);\n * // => [4, 1, 3, 2]\n */\n function shuffle(collection) {\n var func = isArray(collection) ? arrayShuffle : baseShuffle;\n return func(collection);\n }\n\n /**\n * Gets the size of `collection` by returning its length for array-like\n * values or the number of own enumerable string keyed properties for objects.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object|string} collection The collection to inspect.\n * @returns {number} Returns the collection size.\n * @example\n *\n * _.size([1, 2, 3]);\n * // => 3\n *\n * _.size({ 'a': 1, 'b': 2 });\n * // => 2\n *\n * _.size('pebbles');\n * // => 7\n */\n function size(collection) {\n if (collection == null) {\n return 0;\n }\n if (isArrayLike(collection)) {\n return isString(collection) ? stringSize(collection) : collection.length;\n }\n var tag = getTag(collection);\n if (tag == mapTag || tag == setTag) {\n return collection.size;\n }\n return baseKeys(collection).length;\n }\n\n /**\n * Checks if `predicate` returns truthy for **any** element of `collection`.\n * Iteration is stopped once `predicate` returns truthy. The predicate is\n * invoked with three arguments: (value, index|key, collection).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n * else `false`.\n * @example\n *\n * _.some([null, 0, 'yes', false], Boolean);\n * // => true\n *\n * var users = [\n * { 'user': 'barney', 'active': true },\n * { 'user': 'fred', 'active': false }\n * ];\n *\n * // The `_.matches` iteratee shorthand.\n * _.some(users, { 'user': 'barney', 'active': false });\n * // => false\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.some(users, ['active', false]);\n * // => true\n *\n * // The `_.property` iteratee shorthand.\n * _.some(users, 'active');\n * // => true\n */\n function some(collection, predicate, guard) {\n var func = isArray(collection) ? arraySome : baseSome;\n if (guard && isIterateeCall(collection, predicate, guard)) {\n predicate = undefined;\n }\n return func(collection, getIteratee(predicate, 3));\n }\n\n /**\n * Creates an array of elements, sorted in ascending order by the results of\n * running each element in a collection thru each iteratee. This method\n * performs a stable sort, that is, it preserves the original sort order of\n * equal elements. The iteratees are invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Collection\n * @param {Array|Object} collection The collection to iterate over.\n * @param {...(Function|Function[])} [iteratees=[_.identity]]\n * The iteratees to sort by.\n * @returns {Array} Returns the new sorted array.\n * @example\n *\n * var users = [\n * { 'user': 'fred', 'age': 48 },\n * { 'user': 'barney', 'age': 36 },\n * { 'user': 'fred', 'age': 30 },\n * { 'user': 'barney', 'age': 34 }\n * ];\n *\n * _.sortBy(users, [function(o) { return o.user; }]);\n * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]\n *\n * _.sortBy(users, ['user', 'age']);\n * // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]\n */\n var sortBy = baseRest(function(collection, iteratees) {\n if (collection == null) {\n return [];\n }\n var length = iteratees.length;\n if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {\n iteratees = [];\n } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {\n iteratees = [iteratees[0]];\n }\n return baseOrderBy(collection, baseFlatten(iteratees, 1), []);\n });\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n * console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\n var now = ctxNow || function() {\n return root.Date.now();\n };\n\n /*------------------------------------------------------------------------*/\n\n /**\n * The opposite of `_.before`; this method creates a function that invokes\n * `func` once it's called `n` or more times.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {number} n The number of calls before `func` is invoked.\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new restricted function.\n * @example\n *\n * var saves = ['profile', 'settings'];\n *\n * var done = _.after(saves.length, function() {\n * console.log('done saving!');\n * });\n *\n * _.forEach(saves, function(type) {\n * asyncSave({ 'type': type, 'complete': done });\n * });\n * // => Logs 'done saving!' after the two async saves have completed.\n */\n function after(n, func) {\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n n = toInteger(n);\n return function() {\n if (--n < 1) {\n return func.apply(this, arguments);\n }\n };\n }\n\n /**\n * Creates a function that invokes `func`, with up to `n` arguments,\n * ignoring any additional arguments.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Function\n * @param {Function} func The function to cap arguments for.\n * @param {number} [n=func.length] The arity cap.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Function} Returns the new capped function.\n * @example\n *\n * _.map(['6', '8', '10'], _.ary(parseInt, 1));\n * // => [6, 8, 10]\n */\n function ary(func, n, guard) {\n n = guard ? undefined : n;\n n = (func && n == null) ? func.length : n;\n return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);\n }\n\n /**\n * Creates a function that invokes `func`, with the `this` binding and arguments\n * of the created function, while it's called less than `n` times. Subsequent\n * calls to the created function return the result of the last `func` invocation.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Function\n * @param {number} n The number of calls at which `func` is no longer invoked.\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new restricted function.\n * @example\n *\n * jQuery(element).on('click', _.before(5, addContactToList));\n * // => Allows adding up to 4 contacts to the list.\n */\n function before(n, func) {\n var result;\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n n = toInteger(n);\n return function() {\n if (--n > 0) {\n result = func.apply(this, arguments);\n }\n if (n <= 1) {\n func = undefined;\n }\n return result;\n };\n }\n\n /**\n * Creates a function that invokes `func` with the `this` binding of `thisArg`\n * and `partials` prepended to the arguments it receives.\n *\n * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,\n * may be used as a placeholder for partially applied arguments.\n *\n * **Note:** Unlike native `Function#bind`, this method doesn't set the \"length\"\n * property of bound functions.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to bind.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {...*} [partials] The arguments to be partially applied.\n * @returns {Function} Returns the new bound function.\n * @example\n *\n * function greet(greeting, punctuation) {\n * return greeting + ' ' + this.user + punctuation;\n * }\n *\n * var object = { 'user': 'fred' };\n *\n * var bound = _.bind(greet, object, 'hi');\n * bound('!');\n * // => 'hi fred!'\n *\n * // Bound with placeholders.\n * var bound = _.bind(greet, object, _, '!');\n * bound('hi');\n * // => 'hi fred!'\n */\n var bind = baseRest(function(func, thisArg, partials) {\n var bitmask = WRAP_BIND_FLAG;\n if (partials.length) {\n var holders = replaceHolders(partials, getHolder(bind));\n bitmask |= WRAP_PARTIAL_FLAG;\n }\n return createWrap(func, bitmask, thisArg, partials, holders);\n });\n\n /**\n * Creates a function that invokes the method at `object[key]` with `partials`\n * prepended to the arguments it receives.\n *\n * This method differs from `_.bind` by allowing bound functions to reference\n * methods that may be redefined or don't yet exist. See\n * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)\n * for more details.\n *\n * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic\n * builds, may be used as a placeholder for partially applied arguments.\n *\n * @static\n * @memberOf _\n * @since 0.10.0\n * @category Function\n * @param {Object} object The object to invoke the method on.\n * @param {string} key The key of the method.\n * @param {...*} [partials] The arguments to be partially applied.\n * @returns {Function} Returns the new bound function.\n * @example\n *\n * var object = {\n * 'user': 'fred',\n * 'greet': function(greeting, punctuation) {\n * return greeting + ' ' + this.user + punctuation;\n * }\n * };\n *\n * var bound = _.bindKey(object, 'greet', 'hi');\n * bound('!');\n * // => 'hi fred!'\n *\n * object.greet = function(greeting, punctuation) {\n * return greeting + 'ya ' + this.user + punctuation;\n * };\n *\n * bound('!');\n * // => 'hiya fred!'\n *\n * // Bound with placeholders.\n * var bound = _.bindKey(object, 'greet', _, '!');\n * bound('hi');\n * // => 'hiya fred!'\n */\n var bindKey = baseRest(function(object, key, partials) {\n var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;\n if (partials.length) {\n var holders = replaceHolders(partials, getHolder(bindKey));\n bitmask |= WRAP_PARTIAL_FLAG;\n }\n return createWrap(key, bitmask, object, partials, holders);\n });\n\n /**\n * Creates a function that accepts arguments of `func` and either invokes\n * `func` returning its result, if at least `arity` number of arguments have\n * been provided, or returns a function that accepts the remaining `func`\n * arguments, and so on. The arity of `func` may be specified if `func.length`\n * is not sufficient.\n *\n * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,\n * may be used as a placeholder for provided arguments.\n *\n * **Note:** This method doesn't set the \"length\" property of curried functions.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Function\n * @param {Function} func The function to curry.\n * @param {number} [arity=func.length] The arity of `func`.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Function} Returns the new curried function.\n * @example\n *\n * var abc = function(a, b, c) {\n * return [a, b, c];\n * };\n *\n * var curried = _.curry(abc);\n *\n * curried(1)(2)(3);\n * // => [1, 2, 3]\n *\n * curried(1, 2)(3);\n * // => [1, 2, 3]\n *\n * curried(1, 2, 3);\n * // => [1, 2, 3]\n *\n * // Curried with placeholders.\n * curried(1)(_, 3)(2);\n * // => [1, 2, 3]\n */\n function curry(func, arity, guard) {\n arity = guard ? undefined : arity;\n var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);\n result.placeholder = curry.placeholder;\n return result;\n }\n\n /**\n * This method is like `_.curry` except that arguments are applied to `func`\n * in the manner of `_.partialRight` instead of `_.partial`.\n *\n * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic\n * builds, may be used as a placeholder for provided arguments.\n *\n * **Note:** This method doesn't set the \"length\" property of curried functions.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Function\n * @param {Function} func The function to curry.\n * @param {number} [arity=func.length] The arity of `func`.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Function} Returns the new curried function.\n * @example\n *\n * var abc = function(a, b, c) {\n * return [a, b, c];\n * };\n *\n * var curried = _.curryRight(abc);\n *\n * curried(3)(2)(1);\n * // => [1, 2, 3]\n *\n * curried(2, 3)(1);\n * // => [1, 2, 3]\n *\n * curried(1, 2, 3);\n * // => [1, 2, 3]\n *\n * // Curried with placeholders.\n * curried(3)(1, _)(2);\n * // => [1, 2, 3]\n */\n function curryRight(func, arity, guard) {\n arity = guard ? undefined : arity;\n var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);\n result.placeholder = curryRight.placeholder;\n return result;\n }\n\n /**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n * Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n * The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n * Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n * 'leading': true,\n * 'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\n function debounce(func, wait, options) {\n var lastArgs,\n lastThis,\n maxWait,\n result,\n timerId,\n lastCallTime,\n lastInvokeTime = 0,\n leading = false,\n maxing = false,\n trailing = true;\n\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n wait = toNumber(wait) || 0;\n if (isObject(options)) {\n leading = !!options.leading;\n maxing = 'maxWait' in options;\n maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n trailing = 'trailing' in options ? !!options.trailing : trailing;\n }\n\n function invokeFunc(time) {\n var args = lastArgs,\n thisArg = lastThis;\n\n lastArgs = lastThis = undefined;\n lastInvokeTime = time;\n result = func.apply(thisArg, args);\n return result;\n }\n\n function leadingEdge(time) {\n // Reset any `maxWait` timer.\n lastInvokeTime = time;\n // Start the timer for the trailing edge.\n timerId = setTimeout(timerExpired, wait);\n // Invoke the leading edge.\n return leading ? invokeFunc(time) : result;\n }\n\n function remainingWait(time) {\n var timeSinceLastCall = time - lastCallTime,\n timeSinceLastInvoke = time - lastInvokeTime,\n timeWaiting = wait - timeSinceLastCall;\n\n return maxing\n ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)\n : timeWaiting;\n }\n\n function shouldInvoke(time) {\n var timeSinceLastCall = time - lastCallTime,\n timeSinceLastInvoke = time - lastInvokeTime;\n\n // Either this is the first call, activity has stopped and we're at the\n // trailing edge, the system time has gone backwards and we're treating\n // it as the trailing edge, or we've hit the `maxWait` limit.\n return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||\n (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));\n }\n\n function timerExpired() {\n var time = now();\n if (shouldInvoke(time)) {\n return trailingEdge(time);\n }\n // Restart the timer.\n timerId = setTimeout(timerExpired, remainingWait(time));\n }\n\n function trailingEdge(time) {\n timerId = undefined;\n\n // Only invoke if we have `lastArgs` which means `func` has been\n // debounced at least once.\n if (trailing && lastArgs) {\n return invokeFunc(time);\n }\n lastArgs = lastThis = undefined;\n return result;\n }\n\n function cancel() {\n if (timerId !== undefined) {\n clearTimeout(timerId);\n }\n lastInvokeTime = 0;\n lastArgs = lastCallTime = lastThis = timerId = undefined;\n }\n\n function flush() {\n return timerId === undefined ? result : trailingEdge(now());\n }\n\n function debounced() {\n var time = now(),\n isInvoking = shouldInvoke(time);\n\n lastArgs = arguments;\n lastThis = this;\n lastCallTime = time;\n\n if (isInvoking) {\n if (timerId === undefined) {\n return leadingEdge(lastCallTime);\n }\n if (maxing) {\n // Handle invocations in a tight loop.\n clearTimeout(timerId);\n timerId = setTimeout(timerExpired, wait);\n return invokeFunc(lastCallTime);\n }\n }\n if (timerId === undefined) {\n timerId = setTimeout(timerExpired, wait);\n }\n return result;\n }\n debounced.cancel = cancel;\n debounced.flush = flush;\n return debounced;\n }\n\n /**\n * Defers invoking the `func` until the current call stack has cleared. Any\n * additional arguments are provided to `func` when it's invoked.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to defer.\n * @param {...*} [args] The arguments to invoke `func` with.\n * @returns {number} Returns the timer id.\n * @example\n *\n * _.defer(function(text) {\n * console.log(text);\n * }, 'deferred');\n * // => Logs 'deferred' after one millisecond.\n */\n var defer = baseRest(function(func, args) {\n return baseDelay(func, 1, args);\n });\n\n /**\n * Invokes `func` after `wait` milliseconds. Any additional arguments are\n * provided to `func` when it's invoked.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to delay.\n * @param {number} wait The number of milliseconds to delay invocation.\n * @param {...*} [args] The arguments to invoke `func` with.\n * @returns {number} Returns the timer id.\n * @example\n *\n * _.delay(function(text) {\n * console.log(text);\n * }, 1000, 'later');\n * // => Logs 'later' after one second.\n */\n var delay = baseRest(function(func, wait, args) {\n return baseDelay(func, toNumber(wait) || 0, args);\n });\n\n /**\n * Creates a function that invokes `func` with arguments reversed.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Function\n * @param {Function} func The function to flip arguments for.\n * @returns {Function} Returns the new flipped function.\n * @example\n *\n * var flipped = _.flip(function() {\n * return _.toArray(arguments);\n * });\n *\n * flipped('a', 'b', 'c', 'd');\n * // => ['d', 'c', 'b', 'a']\n */\n function flip(func) {\n return createWrap(func, WRAP_FLIP_FLAG);\n }\n\n /**\n * Creates a function that memoizes the result of `func`. If `resolver` is\n * provided, it determines the cache key for storing the result based on the\n * arguments provided to the memoized function. By default, the first argument\n * provided to the memoized function is used as the map cache key. The `func`\n * is invoked with the `this` binding of the memoized function.\n *\n * **Note:** The cache is exposed as the `cache` property on the memoized\n * function. Its creation may be customized by replacing the `_.memoize.Cache`\n * constructor with one whose instances implement the\n * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)\n * method interface of `clear`, `delete`, `get`, `has`, and `set`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to have its output memoized.\n * @param {Function} [resolver] The function to resolve the cache key.\n * @returns {Function} Returns the new memoized function.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n * var other = { 'c': 3, 'd': 4 };\n *\n * var values = _.memoize(_.values);\n * values(object);\n * // => [1, 2]\n *\n * values(other);\n * // => [3, 4]\n *\n * object.a = 2;\n * values(object);\n * // => [1, 2]\n *\n * // Modify the result cache.\n * values.cache.set(object, ['a', 'b']);\n * values(object);\n * // => ['a', 'b']\n *\n * // Replace `_.memoize.Cache`.\n * _.memoize.Cache = WeakMap;\n */\n function memoize(func, resolver) {\n if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n var memoized = function() {\n var args = arguments,\n key = resolver ? resolver.apply(this, args) : args[0],\n cache = memoized.cache;\n\n if (cache.has(key)) {\n return cache.get(key);\n }\n var result = func.apply(this, args);\n memoized.cache = cache.set(key, result) || cache;\n return result;\n };\n memoized.cache = new (memoize.Cache || MapCache);\n return memoized;\n }\n\n // Expose `MapCache`.\n memoize.Cache = MapCache;\n\n /**\n * Creates a function that negates the result of the predicate `func`. The\n * `func` predicate is invoked with the `this` binding and arguments of the\n * created function.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Function\n * @param {Function} predicate The predicate to negate.\n * @returns {Function} Returns the new negated function.\n * @example\n *\n * function isEven(n) {\n * return n % 2 == 0;\n * }\n *\n * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));\n * // => [1, 3, 5]\n */\n function negate(predicate) {\n if (typeof predicate != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n return function() {\n var args = arguments;\n switch (args.length) {\n case 0: return !predicate.call(this);\n case 1: return !predicate.call(this, args[0]);\n case 2: return !predicate.call(this, args[0], args[1]);\n case 3: return !predicate.call(this, args[0], args[1], args[2]);\n }\n return !predicate.apply(this, args);\n };\n }\n\n /**\n * Creates a function that is restricted to invoking `func` once. Repeat calls\n * to the function return the value of the first invocation. The `func` is\n * invoked with the `this` binding and arguments of the created function.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new restricted function.\n * @example\n *\n * var initialize = _.once(createApplication);\n * initialize();\n * initialize();\n * // => `createApplication` is invoked once\n */\n function once(func) {\n return before(2, func);\n }\n\n /**\n * Creates a function that invokes `func` with its arguments transformed.\n *\n * @static\n * @since 4.0.0\n * @memberOf _\n * @category Function\n * @param {Function} func The function to wrap.\n * @param {...(Function|Function[])} [transforms=[_.identity]]\n * The argument transforms.\n * @returns {Function} Returns the new function.\n * @example\n *\n * function doubled(n) {\n * return n * 2;\n * }\n *\n * function square(n) {\n * return n * n;\n * }\n *\n * var func = _.overArgs(function(x, y) {\n * return [x, y];\n * }, [square, doubled]);\n *\n * func(9, 3);\n * // => [81, 6]\n *\n * func(10, 5);\n * // => [100, 10]\n */\n var overArgs = castRest(function(func, transforms) {\n transforms = (transforms.length == 1 && isArray(transforms[0]))\n ? arrayMap(transforms[0], baseUnary(getIteratee()))\n : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));\n\n var funcsLength = transforms.length;\n return baseRest(function(args) {\n var index = -1,\n length = nativeMin(args.length, funcsLength);\n\n while (++index < length) {\n args[index] = transforms[index].call(this, args[index]);\n }\n return apply(func, this, args);\n });\n });\n\n /**\n * Creates a function that invokes `func` with `partials` prepended to the\n * arguments it receives. This method is like `_.bind` except it does **not**\n * alter the `this` binding.\n *\n * The `_.partial.placeholder` value, which defaults to `_` in monolithic\n * builds, may be used as a placeholder for partially applied arguments.\n *\n * **Note:** This method doesn't set the \"length\" property of partially\n * applied functions.\n *\n * @static\n * @memberOf _\n * @since 0.2.0\n * @category Function\n * @param {Function} func The function to partially apply arguments to.\n * @param {...*} [partials] The arguments to be partially applied.\n * @returns {Function} Returns the new partially applied function.\n * @example\n *\n * function greet(greeting, name) {\n * return greeting + ' ' + name;\n * }\n *\n * var sayHelloTo = _.partial(greet, 'hello');\n * sayHelloTo('fred');\n * // => 'hello fred'\n *\n * // Partially applied with placeholders.\n * var greetFred = _.partial(greet, _, 'fred');\n * greetFred('hi');\n * // => 'hi fred'\n */\n var partial = baseRest(function(func, partials) {\n var holders = replaceHolders(partials, getHolder(partial));\n return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);\n });\n\n /**\n * This method is like `_.partial` except that partially applied arguments\n * are appended to the arguments it receives.\n *\n * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic\n * builds, may be used as a placeholder for partially applied arguments.\n *\n * **Note:** This method doesn't set the \"length\" property of partially\n * applied functions.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Function\n * @param {Function} func The function to partially apply arguments to.\n * @param {...*} [partials] The arguments to be partially applied.\n * @returns {Function} Returns the new partially applied function.\n * @example\n *\n * function greet(greeting, name) {\n * return greeting + ' ' + name;\n * }\n *\n * var greetFred = _.partialRight(greet, 'fred');\n * greetFred('hi');\n * // => 'hi fred'\n *\n * // Partially applied with placeholders.\n * var sayHelloTo = _.partialRight(greet, 'hello', _);\n * sayHelloTo('fred');\n * // => 'hello fred'\n */\n var partialRight = baseRest(function(func, partials) {\n var holders = replaceHolders(partials, getHolder(partialRight));\n return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);\n });\n\n /**\n * Creates a function that invokes `func` with arguments arranged according\n * to the specified `indexes` where the argument value at the first index is\n * provided as the first argument, the argument value at the second index is\n * provided as the second argument, and so on.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Function\n * @param {Function} func The function to rearrange arguments for.\n * @param {...(number|number[])} indexes The arranged argument indexes.\n * @returns {Function} Returns the new function.\n * @example\n *\n * var rearged = _.rearg(function(a, b, c) {\n * return [a, b, c];\n * }, [2, 0, 1]);\n *\n * rearged('b', 'c', 'a')\n * // => ['a', 'b', 'c']\n */\n var rearg = flatRest(function(func, indexes) {\n return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);\n });\n\n /**\n * Creates a function that invokes `func` with the `this` binding of the\n * created function and arguments from `start` and beyond provided as\n * an array.\n *\n * **Note:** This method is based on the\n * [rest parameter](https://mdn.io/rest_parameters).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Function\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @returns {Function} Returns the new function.\n * @example\n *\n * var say = _.rest(function(what, names) {\n * return what + ' ' + _.initial(names).join(', ') +\n * (_.size(names) > 1 ? ', & ' : '') + _.last(names);\n * });\n *\n * say('hello', 'fred', 'barney', 'pebbles');\n * // => 'hello fred, barney, & pebbles'\n */\n function rest(func, start) {\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n start = start === undefined ? start : toInteger(start);\n return baseRest(func, start);\n }\n\n /**\n * Creates a function that invokes `func` with the `this` binding of the\n * create function and an array of arguments much like\n * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).\n *\n * **Note:** This method is based on the\n * [spread operator](https://mdn.io/spread_operator).\n *\n * @static\n * @memberOf _\n * @since 3.2.0\n * @category Function\n * @param {Function} func The function to spread arguments over.\n * @param {number} [start=0] The start position of the spread.\n * @returns {Function} Returns the new function.\n * @example\n *\n * var say = _.spread(function(who, what) {\n * return who + ' says ' + what;\n * });\n *\n * say(['fred', 'hello']);\n * // => 'fred says hello'\n *\n * var numbers = Promise.all([\n * Promise.resolve(40),\n * Promise.resolve(36)\n * ]);\n *\n * numbers.then(_.spread(function(x, y) {\n * return x + y;\n * }));\n * // => a Promise of 76\n */\n function spread(func, start) {\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n start = start == null ? 0 : nativeMax(toInteger(start), 0);\n return baseRest(function(args) {\n var array = args[start],\n otherArgs = castSlice(args, 0, start);\n\n if (array) {\n arrayPush(otherArgs, array);\n }\n return apply(func, this, otherArgs);\n });\n }\n\n /**\n * Creates a throttled function that only invokes `func` at most once per\n * every `wait` milliseconds. The throttled function comes with a `cancel`\n * method to cancel delayed `func` invocations and a `flush` method to\n * immediately invoke them. Provide `options` to indicate whether `func`\n * should be invoked on the leading and/or trailing edge of the `wait`\n * timeout. The `func` is invoked with the last arguments provided to the\n * throttled function. Subsequent calls to the throttled function return the\n * result of the last `func` invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the throttled function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.throttle` and `_.debounce`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to throttle.\n * @param {number} [wait=0] The number of milliseconds to throttle invocations to.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=true]\n * Specify invoking on the leading edge of the timeout.\n * @param {boolean} [options.trailing=true]\n * Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new throttled function.\n * @example\n *\n * // Avoid excessively updating the position while scrolling.\n * jQuery(window).on('scroll', _.throttle(updatePosition, 100));\n *\n * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.\n * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });\n * jQuery(element).on('click', throttled);\n *\n * // Cancel the trailing throttled invocation.\n * jQuery(window).on('popstate', throttled.cancel);\n */\n function throttle(func, wait, options) {\n var leading = true,\n trailing = true;\n\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n if (isObject(options)) {\n leading = 'leading' in options ? !!options.leading : leading;\n trailing = 'trailing' in options ? !!options.trailing : trailing;\n }\n return debounce(func, wait, {\n 'leading': leading,\n 'maxWait': wait,\n 'trailing': trailing\n });\n }\n\n /**\n * Creates a function that accepts up to one argument, ignoring any\n * additional arguments.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Function\n * @param {Function} func The function to cap arguments for.\n * @returns {Function} Returns the new capped function.\n * @example\n *\n * _.map(['6', '8', '10'], _.unary(parseInt));\n * // => [6, 8, 10]\n */\n function unary(func) {\n return ary(func, 1);\n }\n\n /**\n * Creates a function that provides `value` to `wrapper` as its first\n * argument. Any additional arguments provided to the function are appended\n * to those provided to the `wrapper`. The wrapper is invoked with the `this`\n * binding of the created function.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {*} value The value to wrap.\n * @param {Function} [wrapper=identity] The wrapper function.\n * @returns {Function} Returns the new function.\n * @example\n *\n * var p = _.wrap(_.escape, function(func, text) {\n * return '

              ' + func(text) + '

              ';\n * });\n *\n * p('fred, barney, & pebbles');\n * // => '

              fred, barney, & pebbles

              '\n */\n function wrap(value, wrapper) {\n return partial(castFunction(wrapper), value);\n }\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Casts `value` as an array if it's not one.\n *\n * @static\n * @memberOf _\n * @since 4.4.0\n * @category Lang\n * @param {*} value The value to inspect.\n * @returns {Array} Returns the cast array.\n * @example\n *\n * _.castArray(1);\n * // => [1]\n *\n * _.castArray({ 'a': 1 });\n * // => [{ 'a': 1 }]\n *\n * _.castArray('abc');\n * // => ['abc']\n *\n * _.castArray(null);\n * // => [null]\n *\n * _.castArray(undefined);\n * // => [undefined]\n *\n * _.castArray();\n * // => []\n *\n * var array = [1, 2, 3];\n * console.log(_.castArray(array) === array);\n * // => true\n */\n function castArray() {\n if (!arguments.length) {\n return [];\n }\n var value = arguments[0];\n return isArray(value) ? value : [value];\n }\n\n /**\n * Creates a shallow clone of `value`.\n *\n * **Note:** This method is loosely based on the\n * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)\n * and supports cloning arrays, array buffers, booleans, date objects, maps,\n * numbers, `Object` objects, regexes, sets, strings, symbols, and typed\n * arrays. The own enumerable properties of `arguments` objects are cloned\n * as plain objects. An empty object is returned for uncloneable values such\n * as error objects, functions, DOM nodes, and WeakMaps.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to clone.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeep\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var shallow = _.clone(objects);\n * console.log(shallow[0] === objects[0]);\n * // => true\n */\n function clone(value) {\n return baseClone(value, CLONE_SYMBOLS_FLAG);\n }\n\n /**\n * This method is like `_.clone` except that it accepts `customizer` which\n * is invoked to produce the cloned value. If `customizer` returns `undefined`,\n * cloning is handled by the method instead. The `customizer` is invoked with\n * up to four arguments; (value [, index|key, object, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to clone.\n * @param {Function} [customizer] The function to customize cloning.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeepWith\n * @example\n *\n * function customizer(value) {\n * if (_.isElement(value)) {\n * return value.cloneNode(false);\n * }\n * }\n *\n * var el = _.cloneWith(document.body, customizer);\n *\n * console.log(el === document.body);\n * // => false\n * console.log(el.nodeName);\n * // => 'BODY'\n * console.log(el.childNodes.length);\n * // => 0\n */\n function cloneWith(value, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);\n }\n\n /**\n * This method is like `_.clone` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @returns {*} Returns the deep cloned value.\n * @see _.clone\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var deep = _.cloneDeep(objects);\n * console.log(deep[0] === objects[0]);\n * // => false\n */\n function cloneDeep(value) {\n return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);\n }\n\n /**\n * This method is like `_.cloneWith` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @param {Function} [customizer] The function to customize cloning.\n * @returns {*} Returns the deep cloned value.\n * @see _.cloneWith\n * @example\n *\n * function customizer(value) {\n * if (_.isElement(value)) {\n * return value.cloneNode(true);\n * }\n * }\n *\n * var el = _.cloneDeepWith(document.body, customizer);\n *\n * console.log(el === document.body);\n * // => false\n * console.log(el.nodeName);\n * // => 'BODY'\n * console.log(el.childNodes.length);\n * // => 20\n */\n function cloneDeepWith(value, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);\n }\n\n /**\n * Checks if `object` conforms to `source` by invoking the predicate\n * properties of `source` with the corresponding property values of `object`.\n *\n * **Note:** This method is equivalent to `_.conforms` when `source` is\n * partially applied.\n *\n * @static\n * @memberOf _\n * @since 4.14.0\n * @category Lang\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property predicates to conform to.\n * @returns {boolean} Returns `true` if `object` conforms, else `false`.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n *\n * _.conformsTo(object, { 'b': function(n) { return n > 1; } });\n * // => true\n *\n * _.conformsTo(object, { 'b': function(n) { return n > 2; } });\n * // => false\n */\n function conformsTo(object, source) {\n return source == null || baseConformsTo(object, source, keys(source));\n }\n\n /**\n * Performs a\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * comparison between two values to determine if they are equivalent.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.eq(object, object);\n * // => true\n *\n * _.eq(object, other);\n * // => false\n *\n * _.eq('a', 'a');\n * // => true\n *\n * _.eq('a', Object('a'));\n * // => false\n *\n * _.eq(NaN, NaN);\n * // => true\n */\n function eq(value, other) {\n return value === other || (value !== value && other !== other);\n }\n\n /**\n * Checks if `value` is greater than `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is greater than `other`,\n * else `false`.\n * @see _.lt\n * @example\n *\n * _.gt(3, 1);\n * // => true\n *\n * _.gt(3, 3);\n * // => false\n *\n * _.gt(1, 3);\n * // => false\n */\n var gt = createRelationalOperation(baseGt);\n\n /**\n * Checks if `value` is greater than or equal to `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is greater than or equal to\n * `other`, else `false`.\n * @see _.lte\n * @example\n *\n * _.gte(3, 1);\n * // => true\n *\n * _.gte(3, 3);\n * // => true\n *\n * _.gte(1, 3);\n * // => false\n */\n var gte = createRelationalOperation(function(value, other) {\n return value >= other;\n });\n\n /**\n * Checks if `value` is likely an `arguments` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n * else `false`.\n * @example\n *\n * _.isArguments(function() { return arguments; }());\n * // => true\n *\n * _.isArguments([1, 2, 3]);\n * // => false\n */\n var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {\n return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&\n !propertyIsEnumerable.call(value, 'callee');\n };\n\n /**\n * Checks if `value` is classified as an `Array` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array, else `false`.\n * @example\n *\n * _.isArray([1, 2, 3]);\n * // => true\n *\n * _.isArray(document.body.children);\n * // => false\n *\n * _.isArray('abc');\n * // => false\n *\n * _.isArray(_.noop);\n * // => false\n */\n var isArray = Array.isArray;\n\n /**\n * Checks if `value` is classified as an `ArrayBuffer` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.\n * @example\n *\n * _.isArrayBuffer(new ArrayBuffer(2));\n * // => true\n *\n * _.isArrayBuffer(new Array(2));\n * // => false\n */\n var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;\n\n /**\n * Checks if `value` is array-like. A value is considered array-like if it's\n * not a function and has a `value.length` that's an integer greater than or\n * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is array-like, else `false`.\n * @example\n *\n * _.isArrayLike([1, 2, 3]);\n * // => true\n *\n * _.isArrayLike(document.body.children);\n * // => true\n *\n * _.isArrayLike('abc');\n * // => true\n *\n * _.isArrayLike(_.noop);\n * // => false\n */\n function isArrayLike(value) {\n return value != null && isLength(value.length) && !isFunction(value);\n }\n\n /**\n * This method is like `_.isArrayLike` except that it also checks if `value`\n * is an object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array-like object,\n * else `false`.\n * @example\n *\n * _.isArrayLikeObject([1, 2, 3]);\n * // => true\n *\n * _.isArrayLikeObject(document.body.children);\n * // => true\n *\n * _.isArrayLikeObject('abc');\n * // => false\n *\n * _.isArrayLikeObject(_.noop);\n * // => false\n */\n function isArrayLikeObject(value) {\n return isObjectLike(value) && isArrayLike(value);\n }\n\n /**\n * Checks if `value` is classified as a boolean primitive or object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.\n * @example\n *\n * _.isBoolean(false);\n * // => true\n *\n * _.isBoolean(null);\n * // => false\n */\n function isBoolean(value) {\n return value === true || value === false ||\n (isObjectLike(value) && baseGetTag(value) == boolTag);\n }\n\n /**\n * Checks if `value` is a buffer.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.\n * @example\n *\n * _.isBuffer(new Buffer(2));\n * // => true\n *\n * _.isBuffer(new Uint8Array(2));\n * // => false\n */\n var isBuffer = nativeIsBuffer || stubFalse;\n\n /**\n * Checks if `value` is classified as a `Date` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a date object, else `false`.\n * @example\n *\n * _.isDate(new Date);\n * // => true\n *\n * _.isDate('Mon April 23 2012');\n * // => false\n */\n var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;\n\n /**\n * Checks if `value` is likely a DOM element.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.\n * @example\n *\n * _.isElement(document.body);\n * // => true\n *\n * _.isElement('');\n * // => false\n */\n function isElement(value) {\n return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);\n }\n\n /**\n * Checks if `value` is an empty object, collection, map, or set.\n *\n * Objects are considered empty if they have no own enumerable string keyed\n * properties.\n *\n * Array-like values such as `arguments` objects, arrays, buffers, strings, or\n * jQuery-like collections are considered empty if they have a `length` of `0`.\n * Similarly, maps and sets are considered empty if they have a `size` of `0`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is empty, else `false`.\n * @example\n *\n * _.isEmpty(null);\n * // => true\n *\n * _.isEmpty(true);\n * // => true\n *\n * _.isEmpty(1);\n * // => true\n *\n * _.isEmpty([1, 2, 3]);\n * // => false\n *\n * _.isEmpty({ 'a': 1 });\n * // => false\n */\n function isEmpty(value) {\n if (value == null) {\n return true;\n }\n if (isArrayLike(value) &&\n (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||\n isBuffer(value) || isTypedArray(value) || isArguments(value))) {\n return !value.length;\n }\n var tag = getTag(value);\n if (tag == mapTag || tag == setTag) {\n return !value.size;\n }\n if (isPrototype(value)) {\n return !baseKeys(value).length;\n }\n for (var key in value) {\n if (hasOwnProperty.call(value, key)) {\n return false;\n }\n }\n return true;\n }\n\n /**\n * Performs a deep comparison between two values to determine if they are\n * equivalent.\n *\n * **Note:** This method supports comparing arrays, array buffers, booleans,\n * date objects, error objects, maps, numbers, `Object` objects, regexes,\n * sets, strings, symbols, and typed arrays. `Object` objects are compared\n * by their own, not inherited, enumerable properties. Functions and DOM\n * nodes are compared by strict equality, i.e. `===`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.isEqual(object, other);\n * // => true\n *\n * object === other;\n * // => false\n */\n function isEqual(value, other) {\n return baseIsEqual(value, other);\n }\n\n /**\n * This method is like `_.isEqual` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with up to\n * six arguments: (objValue, othValue [, index|key, object, other, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * function isGreeting(value) {\n * return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, othValue) {\n * if (isGreeting(objValue) && isGreeting(othValue)) {\n * return true;\n * }\n * }\n *\n * var array = ['hello', 'goodbye'];\n * var other = ['hi', 'goodbye'];\n *\n * _.isEqualWith(array, other, customizer);\n * // => true\n */\n function isEqualWith(value, other, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n var result = customizer ? customizer(value, other) : undefined;\n return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;\n }\n\n /**\n * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,\n * `SyntaxError`, `TypeError`, or `URIError` object.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an error object, else `false`.\n * @example\n *\n * _.isError(new Error);\n * // => true\n *\n * _.isError(Error);\n * // => false\n */\n function isError(value) {\n if (!isObjectLike(value)) {\n return false;\n }\n var tag = baseGetTag(value);\n return tag == errorTag || tag == domExcTag ||\n (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));\n }\n\n /**\n * Checks if `value` is a finite primitive number.\n *\n * **Note:** This method is based on\n * [`Number.isFinite`](https://mdn.io/Number/isFinite).\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.\n * @example\n *\n * _.isFinite(3);\n * // => true\n *\n * _.isFinite(Number.MIN_VALUE);\n * // => true\n *\n * _.isFinite(Infinity);\n * // => false\n *\n * _.isFinite('3');\n * // => false\n */\n function isFinite(value) {\n return typeof value == 'number' && nativeIsFinite(value);\n }\n\n /**\n * Checks if `value` is classified as a `Function` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a function, else `false`.\n * @example\n *\n * _.isFunction(_);\n * // => true\n *\n * _.isFunction(/abc/);\n * // => false\n */\n function isFunction(value) {\n if (!isObject(value)) {\n return false;\n }\n // The use of `Object#toString` avoids issues with the `typeof` operator\n // in Safari 9 which returns 'object' for typed arrays and other constructors.\n var tag = baseGetTag(value);\n return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;\n }\n\n /**\n * Checks if `value` is an integer.\n *\n * **Note:** This method is based on\n * [`Number.isInteger`](https://mdn.io/Number/isInteger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an integer, else `false`.\n * @example\n *\n * _.isInteger(3);\n * // => true\n *\n * _.isInteger(Number.MIN_VALUE);\n * // => false\n *\n * _.isInteger(Infinity);\n * // => false\n *\n * _.isInteger('3');\n * // => false\n */\n function isInteger(value) {\n return typeof value == 'number' && value == toInteger(value);\n }\n\n /**\n * Checks if `value` is a valid array-like length.\n *\n * **Note:** This method is loosely based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.\n * @example\n *\n * _.isLength(3);\n * // => true\n *\n * _.isLength(Number.MIN_VALUE);\n * // => false\n *\n * _.isLength(Infinity);\n * // => false\n *\n * _.isLength('3');\n * // => false\n */\n function isLength(value) {\n return typeof value == 'number' &&\n value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;\n }\n\n /**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\n function isObject(value) {\n var type = typeof value;\n return value != null && (type == 'object' || type == 'function');\n }\n\n /**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\n function isObjectLike(value) {\n return value != null && typeof value == 'object';\n }\n\n /**\n * Checks if `value` is classified as a `Map` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n * @example\n *\n * _.isMap(new Map);\n * // => true\n *\n * _.isMap(new WeakMap);\n * // => false\n */\n var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;\n\n /**\n * Performs a partial deep comparison between `object` and `source` to\n * determine if `object` contains equivalent property values.\n *\n * **Note:** This method is equivalent to `_.matches` when `source` is\n * partially applied.\n *\n * Partial comparisons will match empty array and empty object `source`\n * values against any array or object value, respectively. See `_.isEqual`\n * for a list of supported value comparisons.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property values to match.\n * @returns {boolean} Returns `true` if `object` is a match, else `false`.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n *\n * _.isMatch(object, { 'b': 2 });\n * // => true\n *\n * _.isMatch(object, { 'b': 1 });\n * // => false\n */\n function isMatch(object, source) {\n return object === source || baseIsMatch(object, source, getMatchData(source));\n }\n\n /**\n * This method is like `_.isMatch` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with five\n * arguments: (objValue, srcValue, index|key, object, source).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property values to match.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if `object` is a match, else `false`.\n * @example\n *\n * function isGreeting(value) {\n * return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, srcValue) {\n * if (isGreeting(objValue) && isGreeting(srcValue)) {\n * return true;\n * }\n * }\n *\n * var object = { 'greeting': 'hello' };\n * var source = { 'greeting': 'hi' };\n *\n * _.isMatchWith(object, source, customizer);\n * // => true\n */\n function isMatchWith(object, source, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return baseIsMatch(object, source, getMatchData(source), customizer);\n }\n\n /**\n * Checks if `value` is `NaN`.\n *\n * **Note:** This method is based on\n * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as\n * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for\n * `undefined` and other non-number values.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.\n * @example\n *\n * _.isNaN(NaN);\n * // => true\n *\n * _.isNaN(new Number(NaN));\n * // => true\n *\n * isNaN(undefined);\n * // => true\n *\n * _.isNaN(undefined);\n * // => false\n */\n function isNaN(value) {\n // An `NaN` primitive is the only value that is not equal to itself.\n // Perform the `toStringTag` check first to avoid errors with some\n // ActiveX objects in IE.\n return isNumber(value) && value != +value;\n }\n\n /**\n * Checks if `value` is a pristine native function.\n *\n * **Note:** This method can't reliably detect native functions in the presence\n * of the core-js package because core-js circumvents this kind of detection.\n * Despite multiple requests, the core-js maintainer has made it clear: any\n * attempt to fix the detection will be obstructed. As a result, we're left\n * with little choice but to throw an error. Unfortunately, this also affects\n * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),\n * which rely on core-js.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n * else `false`.\n * @example\n *\n * _.isNative(Array.prototype.push);\n * // => true\n *\n * _.isNative(_);\n * // => false\n */\n function isNative(value) {\n if (isMaskable(value)) {\n throw new Error(CORE_ERROR_TEXT);\n }\n return baseIsNative(value);\n }\n\n /**\n * Checks if `value` is `null`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `null`, else `false`.\n * @example\n *\n * _.isNull(null);\n * // => true\n *\n * _.isNull(void 0);\n * // => false\n */\n function isNull(value) {\n return value === null;\n }\n\n /**\n * Checks if `value` is `null` or `undefined`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is nullish, else `false`.\n * @example\n *\n * _.isNil(null);\n * // => true\n *\n * _.isNil(void 0);\n * // => true\n *\n * _.isNil(NaN);\n * // => false\n */\n function isNil(value) {\n return value == null;\n }\n\n /**\n * Checks if `value` is classified as a `Number` primitive or object.\n *\n * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are\n * classified as numbers, use the `_.isFinite` method.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a number, else `false`.\n * @example\n *\n * _.isNumber(3);\n * // => true\n *\n * _.isNumber(Number.MIN_VALUE);\n * // => true\n *\n * _.isNumber(Infinity);\n * // => true\n *\n * _.isNumber('3');\n * // => false\n */\n function isNumber(value) {\n return typeof value == 'number' ||\n (isObjectLike(value) && baseGetTag(value) == numberTag);\n }\n\n /**\n * Checks if `value` is a plain object, that is, an object created by the\n * `Object` constructor or one with a `[[Prototype]]` of `null`.\n *\n * @static\n * @memberOf _\n * @since 0.8.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * _.isPlainObject(new Foo);\n * // => false\n *\n * _.isPlainObject([1, 2, 3]);\n * // => false\n *\n * _.isPlainObject({ 'x': 0, 'y': 0 });\n * // => true\n *\n * _.isPlainObject(Object.create(null));\n * // => true\n */\n function isPlainObject(value) {\n if (!isObjectLike(value) || baseGetTag(value) != objectTag) {\n return false;\n }\n var proto = getPrototype(value);\n if (proto === null) {\n return true;\n }\n var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;\n return typeof Ctor == 'function' && Ctor instanceof Ctor &&\n funcToString.call(Ctor) == objectCtorString;\n }\n\n /**\n * Checks if `value` is classified as a `RegExp` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.\n * @example\n *\n * _.isRegExp(/abc/);\n * // => true\n *\n * _.isRegExp('/abc/');\n * // => false\n */\n var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;\n\n /**\n * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754\n * double precision number which isn't the result of a rounded unsafe integer.\n *\n * **Note:** This method is based on\n * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.\n * @example\n *\n * _.isSafeInteger(3);\n * // => true\n *\n * _.isSafeInteger(Number.MIN_VALUE);\n * // => false\n *\n * _.isSafeInteger(Infinity);\n * // => false\n *\n * _.isSafeInteger('3');\n * // => false\n */\n function isSafeInteger(value) {\n return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;\n }\n\n /**\n * Checks if `value` is classified as a `Set` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n * @example\n *\n * _.isSet(new Set);\n * // => true\n *\n * _.isSet(new WeakSet);\n * // => false\n */\n var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;\n\n /**\n * Checks if `value` is classified as a `String` primitive or object.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a string, else `false`.\n * @example\n *\n * _.isString('abc');\n * // => true\n *\n * _.isString(1);\n * // => false\n */\n function isString(value) {\n return typeof value == 'string' ||\n (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);\n }\n\n /**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\n function isSymbol(value) {\n return typeof value == 'symbol' ||\n (isObjectLike(value) && baseGetTag(value) == symbolTag);\n }\n\n /**\n * Checks if `value` is classified as a typed array.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n * @example\n *\n * _.isTypedArray(new Uint8Array);\n * // => true\n *\n * _.isTypedArray([]);\n * // => false\n */\n var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;\n\n /**\n * Checks if `value` is `undefined`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.\n * @example\n *\n * _.isUndefined(void 0);\n * // => true\n *\n * _.isUndefined(null);\n * // => false\n */\n function isUndefined(value) {\n return value === undefined;\n }\n\n /**\n * Checks if `value` is classified as a `WeakMap` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.\n * @example\n *\n * _.isWeakMap(new WeakMap);\n * // => true\n *\n * _.isWeakMap(new Map);\n * // => false\n */\n function isWeakMap(value) {\n return isObjectLike(value) && getTag(value) == weakMapTag;\n }\n\n /**\n * Checks if `value` is classified as a `WeakSet` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.\n * @example\n *\n * _.isWeakSet(new WeakSet);\n * // => true\n *\n * _.isWeakSet(new Set);\n * // => false\n */\n function isWeakSet(value) {\n return isObjectLike(value) && baseGetTag(value) == weakSetTag;\n }\n\n /**\n * Checks if `value` is less than `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is less than `other`,\n * else `false`.\n * @see _.gt\n * @example\n *\n * _.lt(1, 3);\n * // => true\n *\n * _.lt(3, 3);\n * // => false\n *\n * _.lt(3, 1);\n * // => false\n */\n var lt = createRelationalOperation(baseLt);\n\n /**\n * Checks if `value` is less than or equal to `other`.\n *\n * @static\n * @memberOf _\n * @since 3.9.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if `value` is less than or equal to\n * `other`, else `false`.\n * @see _.gte\n * @example\n *\n * _.lte(1, 3);\n * // => true\n *\n * _.lte(3, 3);\n * // => true\n *\n * _.lte(3, 1);\n * // => false\n */\n var lte = createRelationalOperation(function(value, other) {\n return value <= other;\n });\n\n /**\n * Converts `value` to an array.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {Array} Returns the converted array.\n * @example\n *\n * _.toArray({ 'a': 1, 'b': 2 });\n * // => [1, 2]\n *\n * _.toArray('abc');\n * // => ['a', 'b', 'c']\n *\n * _.toArray(1);\n * // => []\n *\n * _.toArray(null);\n * // => []\n */\n function toArray(value) {\n if (!value) {\n return [];\n }\n if (isArrayLike(value)) {\n return isString(value) ? stringToArray(value) : copyArray(value);\n }\n if (symIterator && value[symIterator]) {\n return iteratorToArray(value[symIterator]());\n }\n var tag = getTag(value),\n func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);\n\n return func(value);\n }\n\n /**\n * Converts `value` to a finite number.\n *\n * @static\n * @memberOf _\n * @since 4.12.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted number.\n * @example\n *\n * _.toFinite(3.2);\n * // => 3.2\n *\n * _.toFinite(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toFinite(Infinity);\n * // => 1.7976931348623157e+308\n *\n * _.toFinite('3.2');\n * // => 3.2\n */\n function toFinite(value) {\n if (!value) {\n return value === 0 ? value : 0;\n }\n value = toNumber(value);\n if (value === INFINITY || value === -INFINITY) {\n var sign = (value < 0 ? -1 : 1);\n return sign * MAX_INTEGER;\n }\n return value === value ? value : 0;\n }\n\n /**\n * Converts `value` to an integer.\n *\n * **Note:** This method is loosely based on\n * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toInteger(3.2);\n * // => 3\n *\n * _.toInteger(Number.MIN_VALUE);\n * // => 0\n *\n * _.toInteger(Infinity);\n * // => 1.7976931348623157e+308\n *\n * _.toInteger('3.2');\n * // => 3\n */\n function toInteger(value) {\n var result = toFinite(value),\n remainder = result % 1;\n\n return result === result ? (remainder ? result - remainder : result) : 0;\n }\n\n /**\n * Converts `value` to an integer suitable for use as the length of an\n * array-like object.\n *\n * **Note:** This method is based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toLength(3.2);\n * // => 3\n *\n * _.toLength(Number.MIN_VALUE);\n * // => 0\n *\n * _.toLength(Infinity);\n * // => 4294967295\n *\n * _.toLength('3.2');\n * // => 3\n */\n function toLength(value) {\n return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;\n }\n\n /**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\n function toNumber(value) {\n if (typeof value == 'number') {\n return value;\n }\n if (isSymbol(value)) {\n return NAN;\n }\n if (isObject(value)) {\n var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n value = isObject(other) ? (other + '') : other;\n }\n if (typeof value != 'string') {\n return value === 0 ? value : +value;\n }\n value = baseTrim(value);\n var isBinary = reIsBinary.test(value);\n return (isBinary || reIsOctal.test(value))\n ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n : (reIsBadHex.test(value) ? NAN : +value);\n }\n\n /**\n * Converts `value` to a plain object flattening inherited enumerable string\n * keyed properties of `value` to own properties of the plain object.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {Object} Returns the converted plain object.\n * @example\n *\n * function Foo() {\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.assign({ 'a': 1 }, new Foo);\n * // => { 'a': 1, 'b': 2 }\n *\n * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));\n * // => { 'a': 1, 'b': 2, 'c': 3 }\n */\n function toPlainObject(value) {\n return copyObject(value, keysIn(value));\n }\n\n /**\n * Converts `value` to a safe integer. A safe integer can be compared and\n * represented correctly.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toSafeInteger(3.2);\n * // => 3\n *\n * _.toSafeInteger(Number.MIN_VALUE);\n * // => 0\n *\n * _.toSafeInteger(Infinity);\n * // => 9007199254740991\n *\n * _.toSafeInteger('3.2');\n * // => 3\n */\n function toSafeInteger(value) {\n return value\n ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)\n : (value === 0 ? value : 0);\n }\n\n /**\n * Converts `value` to a string. An empty string is returned for `null`\n * and `undefined` values. The sign of `-0` is preserved.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n * @example\n *\n * _.toString(null);\n * // => ''\n *\n * _.toString(-0);\n * // => '-0'\n *\n * _.toString([1, 2, 3]);\n * // => '1,2,3'\n */\n function toString(value) {\n return value == null ? '' : baseToString(value);\n }\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Assigns own enumerable string keyed properties of source objects to the\n * destination object. Source objects are applied from left to right.\n * Subsequent sources overwrite property assignments of previous sources.\n *\n * **Note:** This method mutates `object` and is loosely based on\n * [`Object.assign`](https://mdn.io/Object/assign).\n *\n * @static\n * @memberOf _\n * @since 0.10.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assignIn\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * function Bar() {\n * this.c = 3;\n * }\n *\n * Foo.prototype.b = 2;\n * Bar.prototype.d = 4;\n *\n * _.assign({ 'a': 0 }, new Foo, new Bar);\n * // => { 'a': 1, 'c': 3 }\n */\n var assign = createAssigner(function(object, source) {\n if (isPrototype(source) || isArrayLike(source)) {\n copyObject(source, keys(source), object);\n return;\n }\n for (var key in source) {\n if (hasOwnProperty.call(source, key)) {\n assignValue(object, key, source[key]);\n }\n }\n });\n\n /**\n * This method is like `_.assign` except that it iterates over own and\n * inherited source properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extend\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assign\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * function Bar() {\n * this.c = 3;\n * }\n *\n * Foo.prototype.b = 2;\n * Bar.prototype.d = 4;\n *\n * _.assignIn({ 'a': 0 }, new Foo, new Bar);\n * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }\n */\n var assignIn = createAssigner(function(object, source) {\n copyObject(source, keysIn(source), object);\n });\n\n /**\n * This method is like `_.assignIn` except that it accepts `customizer`\n * which is invoked to produce the assigned values. If `customizer` returns\n * `undefined`, assignment is handled by the method instead. The `customizer`\n * is invoked with five arguments: (objValue, srcValue, key, object, source).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extendWith\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} sources The source objects.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @see _.assignWith\n * @example\n *\n * function customizer(objValue, srcValue) {\n * return _.isUndefined(objValue) ? srcValue : objValue;\n * }\n *\n * var defaults = _.partialRight(_.assignInWith, customizer);\n *\n * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });\n * // => { 'a': 1, 'b': 2 }\n */\n var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {\n copyObject(source, keysIn(source), object, customizer);\n });\n\n /**\n * This method is like `_.assign` except that it accepts `customizer`\n * which is invoked to produce the assigned values. If `customizer` returns\n * `undefined`, assignment is handled by the method instead. The `customizer`\n * is invoked with five arguments: (objValue, srcValue, key, object, source).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} sources The source objects.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @see _.assignInWith\n * @example\n *\n * function customizer(objValue, srcValue) {\n * return _.isUndefined(objValue) ? srcValue : objValue;\n * }\n *\n * var defaults = _.partialRight(_.assignWith, customizer);\n *\n * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });\n * // => { 'a': 1, 'b': 2 }\n */\n var assignWith = createAssigner(function(object, source, srcIndex, customizer) {\n copyObject(source, keys(source), object, customizer);\n });\n\n /**\n * Creates an array of values corresponding to `paths` of `object`.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {...(string|string[])} [paths] The property paths to pick.\n * @returns {Array} Returns the picked values.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };\n *\n * _.at(object, ['a[0].b.c', 'a[1]']);\n * // => [3, 4]\n */\n var at = flatRest(baseAt);\n\n /**\n * Creates an object that inherits from the `prototype` object. If a\n * `properties` object is given, its own enumerable string keyed properties\n * are assigned to the created object.\n *\n * @static\n * @memberOf _\n * @since 2.3.0\n * @category Object\n * @param {Object} prototype The object to inherit from.\n * @param {Object} [properties] The properties to assign to the object.\n * @returns {Object} Returns the new object.\n * @example\n *\n * function Shape() {\n * this.x = 0;\n * this.y = 0;\n * }\n *\n * function Circle() {\n * Shape.call(this);\n * }\n *\n * Circle.prototype = _.create(Shape.prototype, {\n * 'constructor': Circle\n * });\n *\n * var circle = new Circle;\n * circle instanceof Circle;\n * // => true\n *\n * circle instanceof Shape;\n * // => true\n */\n function create(prototype, properties) {\n var result = baseCreate(prototype);\n return properties == null ? result : baseAssign(result, properties);\n }\n\n /**\n * Assigns own and inherited enumerable string keyed properties of source\n * objects to the destination object for all destination properties that\n * resolve to `undefined`. Source objects are applied from left to right.\n * Once a property is set, additional values of the same property are ignored.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.defaultsDeep\n * @example\n *\n * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });\n * // => { 'a': 1, 'b': 2 }\n */\n var defaults = baseRest(function(object, sources) {\n object = Object(object);\n\n var index = -1;\n var length = sources.length;\n var guard = length > 2 ? sources[2] : undefined;\n\n if (guard && isIterateeCall(sources[0], sources[1], guard)) {\n length = 1;\n }\n\n while (++index < length) {\n var source = sources[index];\n var props = keysIn(source);\n var propsIndex = -1;\n var propsLength = props.length;\n\n while (++propsIndex < propsLength) {\n var key = props[propsIndex];\n var value = object[key];\n\n if (value === undefined ||\n (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {\n object[key] = source[key];\n }\n }\n }\n\n return object;\n });\n\n /**\n * This method is like `_.defaults` except that it recursively assigns\n * default properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 3.10.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.defaults\n * @example\n *\n * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });\n * // => { 'a': { 'b': 2, 'c': 3 } }\n */\n var defaultsDeep = baseRest(function(args) {\n args.push(undefined, customDefaultsMerge);\n return apply(mergeWith, undefined, args);\n });\n\n /**\n * This method is like `_.find` except that it returns the key of the first\n * element `predicate` returns truthy for instead of the element itself.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category Object\n * @param {Object} object The object to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {string|undefined} Returns the key of the matched element,\n * else `undefined`.\n * @example\n *\n * var users = {\n * 'barney': { 'age': 36, 'active': true },\n * 'fred': { 'age': 40, 'active': false },\n * 'pebbles': { 'age': 1, 'active': true }\n * };\n *\n * _.findKey(users, function(o) { return o.age < 40; });\n * // => 'barney' (iteration order is not guaranteed)\n *\n * // The `_.matches` iteratee shorthand.\n * _.findKey(users, { 'age': 1, 'active': true });\n * // => 'pebbles'\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findKey(users, ['active', false]);\n * // => 'fred'\n *\n * // The `_.property` iteratee shorthand.\n * _.findKey(users, 'active');\n * // => 'barney'\n */\n function findKey(object, predicate) {\n return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);\n }\n\n /**\n * This method is like `_.findKey` except that it iterates over elements of\n * a collection in the opposite order.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Object\n * @param {Object} object The object to inspect.\n * @param {Function} [predicate=_.identity] The function invoked per iteration.\n * @returns {string|undefined} Returns the key of the matched element,\n * else `undefined`.\n * @example\n *\n * var users = {\n * 'barney': { 'age': 36, 'active': true },\n * 'fred': { 'age': 40, 'active': false },\n * 'pebbles': { 'age': 1, 'active': true }\n * };\n *\n * _.findLastKey(users, function(o) { return o.age < 40; });\n * // => returns 'pebbles' assuming `_.findKey` returns 'barney'\n *\n * // The `_.matches` iteratee shorthand.\n * _.findLastKey(users, { 'age': 36, 'active': true });\n * // => 'barney'\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findLastKey(users, ['active', false]);\n * // => 'fred'\n *\n * // The `_.property` iteratee shorthand.\n * _.findLastKey(users, 'active');\n * // => 'pebbles'\n */\n function findLastKey(object, predicate) {\n return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);\n }\n\n /**\n * Iterates over own and inherited enumerable string keyed properties of an\n * object and invokes `iteratee` for each property. The iteratee is invoked\n * with three arguments: (value, key, object). Iteratee functions may exit\n * iteration early by explicitly returning `false`.\n *\n * @static\n * @memberOf _\n * @since 0.3.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forInRight\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forIn(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).\n */\n function forIn(object, iteratee) {\n return object == null\n ? object\n : baseFor(object, getIteratee(iteratee, 3), keysIn);\n }\n\n /**\n * This method is like `_.forIn` except that it iterates over properties of\n * `object` in the opposite order.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forIn\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forInRight(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.\n */\n function forInRight(object, iteratee) {\n return object == null\n ? object\n : baseForRight(object, getIteratee(iteratee, 3), keysIn);\n }\n\n /**\n * Iterates over own enumerable string keyed properties of an object and\n * invokes `iteratee` for each property. The iteratee is invoked with three\n * arguments: (value, key, object). Iteratee functions may exit iteration\n * early by explicitly returning `false`.\n *\n * @static\n * @memberOf _\n * @since 0.3.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forOwnRight\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forOwn(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'a' then 'b' (iteration order is not guaranteed).\n */\n function forOwn(object, iteratee) {\n return object && baseForOwn(object, getIteratee(iteratee, 3));\n }\n\n /**\n * This method is like `_.forOwn` except that it iterates over properties of\n * `object` in the opposite order.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns `object`.\n * @see _.forOwn\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.forOwnRight(new Foo, function(value, key) {\n * console.log(key);\n * });\n * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.\n */\n function forOwnRight(object, iteratee) {\n return object && baseForOwnRight(object, getIteratee(iteratee, 3));\n }\n\n /**\n * Creates an array of function property names from own enumerable properties\n * of `object`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to inspect.\n * @returns {Array} Returns the function names.\n * @see _.functionsIn\n * @example\n *\n * function Foo() {\n * this.a = _.constant('a');\n * this.b = _.constant('b');\n * }\n *\n * Foo.prototype.c = _.constant('c');\n *\n * _.functions(new Foo);\n * // => ['a', 'b']\n */\n function functions(object) {\n return object == null ? [] : baseFunctions(object, keys(object));\n }\n\n /**\n * Creates an array of function property names from own and inherited\n * enumerable properties of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to inspect.\n * @returns {Array} Returns the function names.\n * @see _.functions\n * @example\n *\n * function Foo() {\n * this.a = _.constant('a');\n * this.b = _.constant('b');\n * }\n *\n * Foo.prototype.c = _.constant('c');\n *\n * _.functionsIn(new Foo);\n * // => ['a', 'b', 'c']\n */\n function functionsIn(object) {\n return object == null ? [] : baseFunctions(object, keysIn(object));\n }\n\n /**\n * Gets the value at `path` of `object`. If the resolved value is\n * `undefined`, the `defaultValue` is returned in its place.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @param {*} [defaultValue] The value returned for `undefined` resolved values.\n * @returns {*} Returns the resolved value.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.get(object, 'a[0].b.c');\n * // => 3\n *\n * _.get(object, ['a', '0', 'b', 'c']);\n * // => 3\n *\n * _.get(object, 'a.b.c', 'default');\n * // => 'default'\n */\n function get(object, path, defaultValue) {\n var result = object == null ? undefined : baseGet(object, path);\n return result === undefined ? defaultValue : result;\n }\n\n /**\n * Checks if `path` is a direct property of `object`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n * @example\n *\n * var object = { 'a': { 'b': 2 } };\n * var other = _.create({ 'a': _.create({ 'b': 2 }) });\n *\n * _.has(object, 'a');\n * // => true\n *\n * _.has(object, 'a.b');\n * // => true\n *\n * _.has(object, ['a', 'b']);\n * // => true\n *\n * _.has(other, 'a');\n * // => false\n */\n function has(object, path) {\n return object != null && hasPath(object, path, baseHas);\n }\n\n /**\n * Checks if `path` is a direct or inherited property of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n * @example\n *\n * var object = _.create({ 'a': _.create({ 'b': 2 }) });\n *\n * _.hasIn(object, 'a');\n * // => true\n *\n * _.hasIn(object, 'a.b');\n * // => true\n *\n * _.hasIn(object, ['a', 'b']);\n * // => true\n *\n * _.hasIn(object, 'b');\n * // => false\n */\n function hasIn(object, path) {\n return object != null && hasPath(object, path, baseHasIn);\n }\n\n /**\n * Creates an object composed of the inverted keys and values of `object`.\n * If `object` contains duplicate values, subsequent values overwrite\n * property assignments of previous values.\n *\n * @static\n * @memberOf _\n * @since 0.7.0\n * @category Object\n * @param {Object} object The object to invert.\n * @returns {Object} Returns the new inverted object.\n * @example\n *\n * var object = { 'a': 1, 'b': 2, 'c': 1 };\n *\n * _.invert(object);\n * // => { '1': 'c', '2': 'b' }\n */\n var invert = createInverter(function(result, value, key) {\n if (value != null &&\n typeof value.toString != 'function') {\n value = nativeObjectToString.call(value);\n }\n\n result[value] = key;\n }, constant(identity));\n\n /**\n * This method is like `_.invert` except that the inverted object is generated\n * from the results of running each element of `object` thru `iteratee`. The\n * corresponding inverted value of each inverted key is an array of keys\n * responsible for generating the inverted value. The iteratee is invoked\n * with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.1.0\n * @category Object\n * @param {Object} object The object to invert.\n * @param {Function} [iteratee=_.identity] The iteratee invoked per element.\n * @returns {Object} Returns the new inverted object.\n * @example\n *\n * var object = { 'a': 1, 'b': 2, 'c': 1 };\n *\n * _.invertBy(object);\n * // => { '1': ['a', 'c'], '2': ['b'] }\n *\n * _.invertBy(object, function(value) {\n * return 'group' + value;\n * });\n * // => { 'group1': ['a', 'c'], 'group2': ['b'] }\n */\n var invertBy = createInverter(function(result, value, key) {\n if (value != null &&\n typeof value.toString != 'function') {\n value = nativeObjectToString.call(value);\n }\n\n if (hasOwnProperty.call(result, value)) {\n result[value].push(key);\n } else {\n result[value] = [key];\n }\n }, getIteratee);\n\n /**\n * Invokes the method at `path` of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the method to invoke.\n * @param {...*} [args] The arguments to invoke the method with.\n * @returns {*} Returns the result of the invoked method.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };\n *\n * _.invoke(object, 'a[0].b.c.slice', 1, 3);\n * // => [2, 3]\n */\n var invoke = baseRest(baseInvoke);\n\n /**\n * Creates an array of the own enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects. See the\n * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * for more details.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keys(new Foo);\n * // => ['a', 'b'] (iteration order is not guaranteed)\n *\n * _.keys('hi');\n * // => ['0', '1']\n */\n function keys(object) {\n return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);\n }\n\n /**\n * Creates an array of the own and inherited enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keysIn(new Foo);\n * // => ['a', 'b', 'c'] (iteration order is not guaranteed)\n */\n function keysIn(object) {\n return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);\n }\n\n /**\n * The opposite of `_.mapValues`; this method creates an object with the\n * same values as `object` and keys generated by running each own enumerable\n * string keyed property of `object` thru `iteratee`. The iteratee is invoked\n * with three arguments: (value, key, object).\n *\n * @static\n * @memberOf _\n * @since 3.8.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns the new mapped object.\n * @see _.mapValues\n * @example\n *\n * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {\n * return key + value;\n * });\n * // => { 'a1': 1, 'b2': 2 }\n */\n function mapKeys(object, iteratee) {\n var result = {};\n iteratee = getIteratee(iteratee, 3);\n\n baseForOwn(object, function(value, key, object) {\n baseAssignValue(result, iteratee(value, key, object), value);\n });\n return result;\n }\n\n /**\n * Creates an object with the same keys as `object` and values generated\n * by running each own enumerable string keyed property of `object` thru\n * `iteratee`. The iteratee is invoked with three arguments:\n * (value, key, object).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @returns {Object} Returns the new mapped object.\n * @see _.mapKeys\n * @example\n *\n * var users = {\n * 'fred': { 'user': 'fred', 'age': 40 },\n * 'pebbles': { 'user': 'pebbles', 'age': 1 }\n * };\n *\n * _.mapValues(users, function(o) { return o.age; });\n * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)\n *\n * // The `_.property` iteratee shorthand.\n * _.mapValues(users, 'age');\n * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)\n */\n function mapValues(object, iteratee) {\n var result = {};\n iteratee = getIteratee(iteratee, 3);\n\n baseForOwn(object, function(value, key, object) {\n baseAssignValue(result, key, iteratee(value, key, object));\n });\n return result;\n }\n\n /**\n * This method is like `_.assign` except that it recursively merges own and\n * inherited enumerable string keyed properties of source objects into the\n * destination object. Source properties that resolve to `undefined` are\n * skipped if a destination value exists. Array and plain object properties\n * are merged recursively. Other objects and value types are overridden by\n * assignment. Source objects are applied from left to right. Subsequent\n * sources overwrite property assignments of previous sources.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 0.5.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {\n * 'a': [{ 'b': 2 }, { 'd': 4 }]\n * };\n *\n * var other = {\n * 'a': [{ 'c': 3 }, { 'e': 5 }]\n * };\n *\n * _.merge(object, other);\n * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }\n */\n var merge = createAssigner(function(object, source, srcIndex) {\n baseMerge(object, source, srcIndex);\n });\n\n /**\n * This method is like `_.merge` except that it accepts `customizer` which\n * is invoked to produce the merged values of the destination and source\n * properties. If `customizer` returns `undefined`, merging is handled by the\n * method instead. The `customizer` is invoked with six arguments:\n * (objValue, srcValue, key, object, source, stack).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} sources The source objects.\n * @param {Function} customizer The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @example\n *\n * function customizer(objValue, srcValue) {\n * if (_.isArray(objValue)) {\n * return objValue.concat(srcValue);\n * }\n * }\n *\n * var object = { 'a': [1], 'b': [2] };\n * var other = { 'a': [3], 'b': [4] };\n *\n * _.mergeWith(object, other, customizer);\n * // => { 'a': [1, 3], 'b': [2, 4] }\n */\n var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {\n baseMerge(object, source, srcIndex, customizer);\n });\n\n /**\n * The opposite of `_.pick`; this method creates an object composed of the\n * own and inherited enumerable property paths of `object` that are not omitted.\n *\n * **Note:** This method is considerably slower than `_.pick`.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The source object.\n * @param {...(string|string[])} [paths] The property paths to omit.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.omit(object, ['a', 'c']);\n * // => { 'b': '2' }\n */\n var omit = flatRest(function(object, paths) {\n var result = {};\n if (object == null) {\n return result;\n }\n var isDeep = false;\n paths = arrayMap(paths, function(path) {\n path = castPath(path, object);\n isDeep || (isDeep = path.length > 1);\n return path;\n });\n copyObject(object, getAllKeysIn(object), result);\n if (isDeep) {\n result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);\n }\n var length = paths.length;\n while (length--) {\n baseUnset(result, paths[length]);\n }\n return result;\n });\n\n /**\n * The opposite of `_.pickBy`; this method creates an object composed of\n * the own and inherited enumerable string keyed properties of `object` that\n * `predicate` doesn't return truthy for. The predicate is invoked with two\n * arguments: (value, key).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The source object.\n * @param {Function} [predicate=_.identity] The function invoked per property.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.omitBy(object, _.isNumber);\n * // => { 'b': '2' }\n */\n function omitBy(object, predicate) {\n return pickBy(object, negate(getIteratee(predicate)));\n }\n\n /**\n * Creates an object composed of the picked `object` properties.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The source object.\n * @param {...(string|string[])} [paths] The property paths to pick.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.pick(object, ['a', 'c']);\n * // => { 'a': 1, 'c': 3 }\n */\n var pick = flatRest(function(object, paths) {\n return object == null ? {} : basePick(object, paths);\n });\n\n /**\n * Creates an object composed of the `object` properties `predicate` returns\n * truthy for. The predicate is invoked with two arguments: (value, key).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The source object.\n * @param {Function} [predicate=_.identity] The function invoked per property.\n * @returns {Object} Returns the new object.\n * @example\n *\n * var object = { 'a': 1, 'b': '2', 'c': 3 };\n *\n * _.pickBy(object, _.isNumber);\n * // => { 'a': 1, 'c': 3 }\n */\n function pickBy(object, predicate) {\n if (object == null) {\n return {};\n }\n var props = arrayMap(getAllKeysIn(object), function(prop) {\n return [prop];\n });\n predicate = getIteratee(predicate);\n return basePickBy(object, props, function(value, path) {\n return predicate(value, path[0]);\n });\n }\n\n /**\n * This method is like `_.get` except that if the resolved value is a\n * function it's invoked with the `this` binding of its parent object and\n * its result is returned.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to resolve.\n * @param {*} [defaultValue] The value returned for `undefined` resolved values.\n * @returns {*} Returns the resolved value.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };\n *\n * _.result(object, 'a[0].b.c1');\n * // => 3\n *\n * _.result(object, 'a[0].b.c2');\n * // => 4\n *\n * _.result(object, 'a[0].b.c3', 'default');\n * // => 'default'\n *\n * _.result(object, 'a[0].b.c3', _.constant('default'));\n * // => 'default'\n */\n function result(object, path, defaultValue) {\n path = castPath(path, object);\n\n var index = -1,\n length = path.length;\n\n // Ensure the loop is entered when path is empty.\n if (!length) {\n length = 1;\n object = undefined;\n }\n while (++index < length) {\n var value = object == null ? undefined : object[toKey(path[index])];\n if (value === undefined) {\n index = length;\n value = defaultValue;\n }\n object = isFunction(value) ? value.call(object) : value;\n }\n return object;\n }\n\n /**\n * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,\n * it's created. Arrays are created for missing index properties while objects\n * are created for all other missing properties. Use `_.setWith` to customize\n * `path` creation.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.set(object, 'a[0].b.c', 4);\n * console.log(object.a[0].b.c);\n * // => 4\n *\n * _.set(object, ['x', '0', 'y', 'z'], 5);\n * console.log(object.x[0].y.z);\n * // => 5\n */\n function set(object, path, value) {\n return object == null ? object : baseSet(object, path, value);\n }\n\n /**\n * This method is like `_.set` except that it accepts `customizer` which is\n * invoked to produce the objects of `path`. If `customizer` returns `undefined`\n * path creation is handled by the method instead. The `customizer` is invoked\n * with three arguments: (nsValue, key, nsObject).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {};\n *\n * _.setWith(object, '[0][1]', 'a', Object);\n * // => { '0': { '1': 'a' } }\n */\n function setWith(object, path, value, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return object == null ? object : baseSet(object, path, value, customizer);\n }\n\n /**\n * Creates an array of own enumerable string keyed-value pairs for `object`\n * which can be consumed by `_.fromPairs`. If `object` is a map or set, its\n * entries are returned.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias entries\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the key-value pairs.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.toPairs(new Foo);\n * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)\n */\n var toPairs = createToPairs(keys);\n\n /**\n * Creates an array of own and inherited enumerable string keyed-value pairs\n * for `object` which can be consumed by `_.fromPairs`. If `object` is a map\n * or set, its entries are returned.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias entriesIn\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the key-value pairs.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.toPairsIn(new Foo);\n * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)\n */\n var toPairsIn = createToPairs(keysIn);\n\n /**\n * An alternative to `_.reduce`; this method transforms `object` to a new\n * `accumulator` object which is the result of running each of its own\n * enumerable string keyed properties thru `iteratee`, with each invocation\n * potentially mutating the `accumulator` object. If `accumulator` is not\n * provided, a new object with the same `[[Prototype]]` will be used. The\n * iteratee is invoked with four arguments: (accumulator, value, key, object).\n * Iteratee functions may exit iteration early by explicitly returning `false`.\n *\n * @static\n * @memberOf _\n * @since 1.3.0\n * @category Object\n * @param {Object} object The object to iterate over.\n * @param {Function} [iteratee=_.identity] The function invoked per iteration.\n * @param {*} [accumulator] The custom accumulator value.\n * @returns {*} Returns the accumulated value.\n * @example\n *\n * _.transform([2, 3, 4], function(result, n) {\n * result.push(n *= n);\n * return n % 2 == 0;\n * }, []);\n * // => [4, 9]\n *\n * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {\n * (result[value] || (result[value] = [])).push(key);\n * }, {});\n * // => { '1': ['a', 'c'], '2': ['b'] }\n */\n function transform(object, iteratee, accumulator) {\n var isArr = isArray(object),\n isArrLike = isArr || isBuffer(object) || isTypedArray(object);\n\n iteratee = getIteratee(iteratee, 4);\n if (accumulator == null) {\n var Ctor = object && object.constructor;\n if (isArrLike) {\n accumulator = isArr ? new Ctor : [];\n }\n else if (isObject(object)) {\n accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};\n }\n else {\n accumulator = {};\n }\n }\n (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {\n return iteratee(accumulator, value, index, object);\n });\n return accumulator;\n }\n\n /**\n * Removes the property at `path` of `object`.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to unset.\n * @returns {boolean} Returns `true` if the property is deleted, else `false`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 7 } }] };\n * _.unset(object, 'a[0].b.c');\n * // => true\n *\n * console.log(object);\n * // => { 'a': [{ 'b': {} }] };\n *\n * _.unset(object, ['a', '0', 'b', 'c']);\n * // => true\n *\n * console.log(object);\n * // => { 'a': [{ 'b': {} }] };\n */\n function unset(object, path) {\n return object == null ? true : baseUnset(object, path);\n }\n\n /**\n * This method is like `_.set` except that accepts `updater` to produce the\n * value to set. Use `_.updateWith` to customize `path` creation. The `updater`\n * is invoked with one argument: (value).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.6.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {Function} updater The function to produce the updated value.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.update(object, 'a[0].b.c', function(n) { return n * n; });\n * console.log(object.a[0].b.c);\n * // => 9\n *\n * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });\n * console.log(object.x[0].y.z);\n * // => 0\n */\n function update(object, path, updater) {\n return object == null ? object : baseUpdate(object, path, castFunction(updater));\n }\n\n /**\n * This method is like `_.update` except that it accepts `customizer` which is\n * invoked to produce the objects of `path`. If `customizer` returns `undefined`\n * path creation is handled by the method instead. The `customizer` is invoked\n * with three arguments: (nsValue, key, nsObject).\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.6.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {Function} updater The function to produce the updated value.\n * @param {Function} [customizer] The function to customize assigned values.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {};\n *\n * _.updateWith(object, '[0][1]', _.constant('a'), Object);\n * // => { '0': { '1': 'a' } }\n */\n function updateWith(object, path, updater, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);\n }\n\n /**\n * Creates an array of the own enumerable string keyed property values of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property values.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.values(new Foo);\n * // => [1, 2] (iteration order is not guaranteed)\n *\n * _.values('hi');\n * // => ['h', 'i']\n */\n function values(object) {\n return object == null ? [] : baseValues(object, keys(object));\n }\n\n /**\n * Creates an array of the own and inherited enumerable string keyed property\n * values of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property values.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.valuesIn(new Foo);\n * // => [1, 2, 3] (iteration order is not guaranteed)\n */\n function valuesIn(object) {\n return object == null ? [] : baseValues(object, keysIn(object));\n }\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Clamps `number` within the inclusive `lower` and `upper` bounds.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Number\n * @param {number} number The number to clamp.\n * @param {number} [lower] The lower bound.\n * @param {number} upper The upper bound.\n * @returns {number} Returns the clamped number.\n * @example\n *\n * _.clamp(-10, -5, 5);\n * // => -5\n *\n * _.clamp(10, -5, 5);\n * // => 5\n */\n function clamp(number, lower, upper) {\n if (upper === undefined) {\n upper = lower;\n lower = undefined;\n }\n if (upper !== undefined) {\n upper = toNumber(upper);\n upper = upper === upper ? upper : 0;\n }\n if (lower !== undefined) {\n lower = toNumber(lower);\n lower = lower === lower ? lower : 0;\n }\n return baseClamp(toNumber(number), lower, upper);\n }\n\n /**\n * Checks if `n` is between `start` and up to, but not including, `end`. If\n * `end` is not specified, it's set to `start` with `start` then set to `0`.\n * If `start` is greater than `end` the params are swapped to support\n * negative ranges.\n *\n * @static\n * @memberOf _\n * @since 3.3.0\n * @category Number\n * @param {number} number The number to check.\n * @param {number} [start=0] The start of the range.\n * @param {number} end The end of the range.\n * @returns {boolean} Returns `true` if `number` is in the range, else `false`.\n * @see _.range, _.rangeRight\n * @example\n *\n * _.inRange(3, 2, 4);\n * // => true\n *\n * _.inRange(4, 8);\n * // => true\n *\n * _.inRange(4, 2);\n * // => false\n *\n * _.inRange(2, 2);\n * // => false\n *\n * _.inRange(1.2, 2);\n * // => true\n *\n * _.inRange(5.2, 4);\n * // => false\n *\n * _.inRange(-3, -2, -6);\n * // => true\n */\n function inRange(number, start, end) {\n start = toFinite(start);\n if (end === undefined) {\n end = start;\n start = 0;\n } else {\n end = toFinite(end);\n }\n number = toNumber(number);\n return baseInRange(number, start, end);\n }\n\n /**\n * Produces a random number between the inclusive `lower` and `upper` bounds.\n * If only one argument is provided a number between `0` and the given number\n * is returned. If `floating` is `true`, or either `lower` or `upper` are\n * floats, a floating-point number is returned instead of an integer.\n *\n * **Note:** JavaScript follows the IEEE-754 standard for resolving\n * floating-point values which can produce unexpected results.\n *\n * @static\n * @memberOf _\n * @since 0.7.0\n * @category Number\n * @param {number} [lower=0] The lower bound.\n * @param {number} [upper=1] The upper bound.\n * @param {boolean} [floating] Specify returning a floating-point number.\n * @returns {number} Returns the random number.\n * @example\n *\n * _.random(0, 5);\n * // => an integer between 0 and 5\n *\n * _.random(5);\n * // => also an integer between 0 and 5\n *\n * _.random(5, true);\n * // => a floating-point number between 0 and 5\n *\n * _.random(1.2, 5.2);\n * // => a floating-point number between 1.2 and 5.2\n */\n function random(lower, upper, floating) {\n if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {\n upper = floating = undefined;\n }\n if (floating === undefined) {\n if (typeof upper == 'boolean') {\n floating = upper;\n upper = undefined;\n }\n else if (typeof lower == 'boolean') {\n floating = lower;\n lower = undefined;\n }\n }\n if (lower === undefined && upper === undefined) {\n lower = 0;\n upper = 1;\n }\n else {\n lower = toFinite(lower);\n if (upper === undefined) {\n upper = lower;\n lower = 0;\n } else {\n upper = toFinite(upper);\n }\n }\n if (lower > upper) {\n var temp = lower;\n lower = upper;\n upper = temp;\n }\n if (floating || lower % 1 || upper % 1) {\n var rand = nativeRandom();\n return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);\n }\n return baseRandom(lower, upper);\n }\n\n /*------------------------------------------------------------------------*/\n\n /**\n * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the camel cased string.\n * @example\n *\n * _.camelCase('Foo Bar');\n * // => 'fooBar'\n *\n * _.camelCase('--foo-bar--');\n * // => 'fooBar'\n *\n * _.camelCase('__FOO_BAR__');\n * // => 'fooBar'\n */\n var camelCase = createCompounder(function(result, word, index) {\n word = word.toLowerCase();\n return result + (index ? capitalize(word) : word);\n });\n\n /**\n * Converts the first character of `string` to upper case and the remaining\n * to lower case.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to capitalize.\n * @returns {string} Returns the capitalized string.\n * @example\n *\n * _.capitalize('FRED');\n * // => 'Fred'\n */\n function capitalize(string) {\n return upperFirst(toString(string).toLowerCase());\n }\n\n /**\n * Deburrs `string` by converting\n * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)\n * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)\n * letters to basic Latin letters and removing\n * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to deburr.\n * @returns {string} Returns the deburred string.\n * @example\n *\n * _.deburr('déjà vu');\n * // => 'deja vu'\n */\n function deburr(string) {\n string = toString(string);\n return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');\n }\n\n /**\n * Checks if `string` ends with the given target string.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to inspect.\n * @param {string} [target] The string to search for.\n * @param {number} [position=string.length] The position to search up to.\n * @returns {boolean} Returns `true` if `string` ends with `target`,\n * else `false`.\n * @example\n *\n * _.endsWith('abc', 'c');\n * // => true\n *\n * _.endsWith('abc', 'b');\n * // => false\n *\n * _.endsWith('abc', 'b', 2);\n * // => true\n */\n function endsWith(string, target, position) {\n string = toString(string);\n target = baseToString(target);\n\n var length = string.length;\n position = position === undefined\n ? length\n : baseClamp(toInteger(position), 0, length);\n\n var end = position;\n position -= target.length;\n return position >= 0 && string.slice(position, end) == target;\n }\n\n /**\n * Converts the characters \"&\", \"<\", \">\", '\"', and \"'\" in `string` to their\n * corresponding HTML entities.\n *\n * **Note:** No other characters are escaped. To escape additional\n * characters use a third-party library like [_he_](https://mths.be/he).\n *\n * Though the \">\" character is escaped for symmetry, characters like\n * \">\" and \"/\" don't need escaping in HTML and have no special meaning\n * unless they're part of a tag or unquoted attribute value. See\n * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)\n * (under \"semi-related fun fact\") for more details.\n *\n * When working with HTML you should always\n * [quote attribute values](http://wonko.com/post/html-escaping) to reduce\n * XSS vectors.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category String\n * @param {string} [string=''] The string to escape.\n * @returns {string} Returns the escaped string.\n * @example\n *\n * _.escape('fred, barney, & pebbles');\n * // => 'fred, barney, & pebbles'\n */\n function escape(string) {\n string = toString(string);\n return (string && reHasUnescapedHtml.test(string))\n ? string.replace(reUnescapedHtml, escapeHtmlChar)\n : string;\n }\n\n /**\n * Escapes the `RegExp` special characters \"^\", \"$\", \"\\\", \".\", \"*\", \"+\",\n * \"?\", \"(\", \")\", \"[\", \"]\", \"{\", \"}\", and \"|\" in `string`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to escape.\n * @returns {string} Returns the escaped string.\n * @example\n *\n * _.escapeRegExp('[lodash](https://lodash.com/)');\n * // => '\\[lodash\\]\\(https://lodash\\.com/\\)'\n */\n function escapeRegExp(string) {\n string = toString(string);\n return (string && reHasRegExpChar.test(string))\n ? string.replace(reRegExpChar, '\\\\$&')\n : string;\n }\n\n /**\n * Converts `string` to\n * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the kebab cased string.\n * @example\n *\n * _.kebabCase('Foo Bar');\n * // => 'foo-bar'\n *\n * _.kebabCase('fooBar');\n * // => 'foo-bar'\n *\n * _.kebabCase('__FOO_BAR__');\n * // => 'foo-bar'\n */\n var kebabCase = createCompounder(function(result, word, index) {\n return result + (index ? '-' : '') + word.toLowerCase();\n });\n\n /**\n * Converts `string`, as space separated words, to lower case.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the lower cased string.\n * @example\n *\n * _.lowerCase('--Foo-Bar--');\n * // => 'foo bar'\n *\n * _.lowerCase('fooBar');\n * // => 'foo bar'\n *\n * _.lowerCase('__FOO_BAR__');\n * // => 'foo bar'\n */\n var lowerCase = createCompounder(function(result, word, index) {\n return result + (index ? ' ' : '') + word.toLowerCase();\n });\n\n /**\n * Converts the first character of `string` to lower case.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the converted string.\n * @example\n *\n * _.lowerFirst('Fred');\n * // => 'fred'\n *\n * _.lowerFirst('FRED');\n * // => 'fRED'\n */\n var lowerFirst = createCaseFirst('toLowerCase');\n\n /**\n * Pads `string` on the left and right sides if it's shorter than `length`.\n * Padding characters are truncated if they can't be evenly divided by `length`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to pad.\n * @param {number} [length=0] The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padded string.\n * @example\n *\n * _.pad('abc', 8);\n * // => ' abc '\n *\n * _.pad('abc', 8, '_-');\n * // => '_-abc_-_'\n *\n * _.pad('abc', 3);\n * // => 'abc'\n */\n function pad(string, length, chars) {\n string = toString(string);\n length = toInteger(length);\n\n var strLength = length ? stringSize(string) : 0;\n if (!length || strLength >= length) {\n return string;\n }\n var mid = (length - strLength) / 2;\n return (\n createPadding(nativeFloor(mid), chars) +\n string +\n createPadding(nativeCeil(mid), chars)\n );\n }\n\n /**\n * Pads `string` on the right side if it's shorter than `length`. Padding\n * characters are truncated if they exceed `length`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to pad.\n * @param {number} [length=0] The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padded string.\n * @example\n *\n * _.padEnd('abc', 6);\n * // => 'abc '\n *\n * _.padEnd('abc', 6, '_-');\n * // => 'abc_-_'\n *\n * _.padEnd('abc', 3);\n * // => 'abc'\n */\n function padEnd(string, length, chars) {\n string = toString(string);\n length = toInteger(length);\n\n var strLength = length ? stringSize(string) : 0;\n return (length && strLength < length)\n ? (string + createPadding(length - strLength, chars))\n : string;\n }\n\n /**\n * Pads `string` on the left side if it's shorter than `length`. Padding\n * characters are truncated if they exceed `length`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to pad.\n * @param {number} [length=0] The padding length.\n * @param {string} [chars=' '] The string used as padding.\n * @returns {string} Returns the padded string.\n * @example\n *\n * _.padStart('abc', 6);\n * // => ' abc'\n *\n * _.padStart('abc', 6, '_-');\n * // => '_-_abc'\n *\n * _.padStart('abc', 3);\n * // => 'abc'\n */\n function padStart(string, length, chars) {\n string = toString(string);\n length = toInteger(length);\n\n var strLength = length ? stringSize(string) : 0;\n return (length && strLength < length)\n ? (createPadding(length - strLength, chars) + string)\n : string;\n }\n\n /**\n * Converts `string` to an integer of the specified radix. If `radix` is\n * `undefined` or `0`, a `radix` of `10` is used unless `value` is a\n * hexadecimal, in which case a `radix` of `16` is used.\n *\n * **Note:** This method aligns with the\n * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category String\n * @param {string} string The string to convert.\n * @param {number} [radix=10] The radix to interpret `value` by.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.parseInt('08');\n * // => 8\n *\n * _.map(['6', '08', '10'], _.parseInt);\n * // => [6, 8, 10]\n */\n function parseInt(string, radix, guard) {\n if (guard || radix == null) {\n radix = 0;\n } else if (radix) {\n radix = +radix;\n }\n return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);\n }\n\n /**\n * Repeats the given string `n` times.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to repeat.\n * @param {number} [n=1] The number of times to repeat the string.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {string} Returns the repeated string.\n * @example\n *\n * _.repeat('*', 3);\n * // => '***'\n *\n * _.repeat('abc', 2);\n * // => 'abcabc'\n *\n * _.repeat('abc', 0);\n * // => ''\n */\n function repeat(string, n, guard) {\n if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {\n n = 1;\n } else {\n n = toInteger(n);\n }\n return baseRepeat(toString(string), n);\n }\n\n /**\n * Replaces matches for `pattern` in `string` with `replacement`.\n *\n * **Note:** This method is based on\n * [`String#replace`](https://mdn.io/String/replace).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to modify.\n * @param {RegExp|string} pattern The pattern to replace.\n * @param {Function|string} replacement The match replacement.\n * @returns {string} Returns the modified string.\n * @example\n *\n * _.replace('Hi Fred', 'Fred', 'Barney');\n * // => 'Hi Barney'\n */\n function replace() {\n var args = arguments,\n string = toString(args[0]);\n\n return args.length < 3 ? string : string.replace(args[1], args[2]);\n }\n\n /**\n * Converts `string` to\n * [snake case](https://en.wikipedia.org/wiki/Snake_case).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the snake cased string.\n * @example\n *\n * _.snakeCase('Foo Bar');\n * // => 'foo_bar'\n *\n * _.snakeCase('fooBar');\n * // => 'foo_bar'\n *\n * _.snakeCase('--FOO-BAR--');\n * // => 'foo_bar'\n */\n var snakeCase = createCompounder(function(result, word, index) {\n return result + (index ? '_' : '') + word.toLowerCase();\n });\n\n /**\n * Splits `string` by `separator`.\n *\n * **Note:** This method is based on\n * [`String#split`](https://mdn.io/String/split).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category String\n * @param {string} [string=''] The string to split.\n * @param {RegExp|string} separator The separator pattern to split by.\n * @param {number} [limit] The length to truncate results to.\n * @returns {Array} Returns the string segments.\n * @example\n *\n * _.split('a-b-c', '-', 2);\n * // => ['a', 'b']\n */\n function split(string, separator, limit) {\n if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {\n separator = limit = undefined;\n }\n limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;\n if (!limit) {\n return [];\n }\n string = toString(string);\n if (string && (\n typeof separator == 'string' ||\n (separator != null && !isRegExp(separator))\n )) {\n separator = baseToString(separator);\n if (!separator && hasUnicode(string)) {\n return castSlice(stringToArray(string), 0, limit);\n }\n }\n return string.split(separator, limit);\n }\n\n /**\n * Converts `string` to\n * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).\n *\n * @static\n * @memberOf _\n * @since 3.1.0\n * @category String\n * @param {string} [string=''] The string to convert.\n * @returns {string} Returns the start cased string.\n * @example\n *\n * _.startCase('--foo-bar--');\n * // => 'Foo Bar'\n *\n * _.startCase('fooBar');\n * // => 'Foo Bar'\n *\n * _.startCase('__FOO_BAR__');\n * // => 'FOO BAR'\n */\n var startCase = createCompounder(function(result, word, index) {\n return result + (index ? ' ' : '') + upperFirst(word);\n });\n\n /**\n * Checks if `string` starts with the given target string.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category String\n * @param {string} [string=''] The string to inspect.\n * @param {string} [target] The string to search for.\n * @param {number} [position=0] The position to search from.\n * @returns {boolean} Returns `true` if `string` starts with `target`,\n * else `false`.\n * @example\n *\n * _.startsWith('abc', 'a');\n * // => true\n *\n * _.startsWith('abc', 'b');\n * // => false\n *\n * _.startsWith('abc', 'b', 1);\n * // => true\n */\n function startsWith(string, target, position) {\n string = toString(string);\n position = position == null\n ? 0\n : baseClamp(toInteger(position), 0, string.length);\n\n target = baseToString(target);\n return string.slice(position, position + target.length) == target;\n }\n\n /**\n * Creates a compiled template function that can interpolate data properties\n * in \"interpolate\" delimiters, HTML-escape interpolated data properties in\n * \"escape\" delimiters, and execute JavaScript in \"evaluate\" delimiters. Data\n * properties may be accessed as free variables in the template. If a setting\n * object is given, it takes precedence over `_.templateSettings` values.\n *\n * **Note:** In the development build `_.template` utilizes\n * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)\n * for easier debugging.\n *\n * For more information on precompiling templates see\n * [lodash's custom builds documentation](https://lodash.com/custom-builds).\n *\n * For more information on Chrome extension sandboxes see\n * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category String\n * @param {string} [string=''] The template string.\n * @param {Object} [options={}] The options object.\n * @param {RegExp} [options.escape=_.templateSettings.escape]\n * The HTML \"escape\" delimiter.\n * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]\n * The \"evaluate\" delimiter.\n * @param {Object} [options.imports=_.templateSettings.imports]\n * An object to import into the template as free variables.\n * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]\n * The \"interpolate\" delimiter.\n * @param {string} [options.sourceURL='lodash.templateSources[n]']\n * The sourceURL of the compiled template.\n * @param {string} [options.variable='obj']\n * The data object variable name.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Function} Returns the compiled template function.\n * @example\n *\n * // Use the \"interpolate\" delimiter to create a compiled template.\n * var compiled = _.template('hello <%= user %>!');\n * compiled({ 'user': 'fred' });\n * // => 'hello fred!'\n *\n * // Use the HTML \"escape\" delimiter to escape data property values.\n * var compiled = _.template('<%- value %>');\n * compiled({ 'value': ' + \ No newline at end of file diff --git a/src/index.js b/src/index.js index 05a37424361cdcfe03b89c11f9990af6d1096bc7..494de21f41e7fccb8c6cc317523894f144257930 100644 --- a/src/index.js +++ b/src/index.js @@ -1,10 +1,11 @@ // import { plotClusters } from './clusters' import { init_ablation_plot } from './plotting' -import 'katex/dist/katex.min.css'; -import katex from 'katex'; +import { init_memory_plot } from './memory' + document.addEventListener("DOMContentLoaded", () => { console.log("DOMContentLoaded"); // plotClusters(); init_ablation_plot(); -}, { once: true }); \ No newline at end of file + init_memory_plot(); +}, { once: true }); diff --git a/src/memory.js b/src/memory.js new file mode 100755 index 0000000000000000000000000000000000000000..4040736cdf1ce322a77747ea47807d8ea62c74a6 --- /dev/null +++ b/src/memory.js @@ -0,0 +1,346 @@ +import * as d3 from 'd3'; + +export function activationMemory( + a, // attention heads + b, // micro batch size + h, // hidden dimension size + h_ff, // feedforward dimension size (often h_ff = 4h) + L, // number of layers + s, // sequence length + v, // vocab size + mixed = true, + recomputation = "none", + ff_activation = "relu" +) { + console.log('activationMemory called with:', { a, b, h, h_ff, L, s, v, mixed, recomputation, ff_activation }); + // https://arxiv.org/pdf/2205.05198 + const bytesPerValue = mixed ? 2 : 4; + + const oneLayerAttention = s * b * h * (bytesPerValue * 5 + 1) + ((2 * bytesPerValue + 1) * a * s * s * b); // eq (2) + + let oneLayerFeedforward; + if (ff_activation === "relu") { + oneLayerFeedforward = (s * b * h * bytesPerValue + (s * b * h_ff * bytesPerValue) // inputs of 1st/2nd linear layers + + s * b * h); // dropout + } else if (ff_activation === "gelu") { + oneLayerFeedforward = (s * b * h * bytesPerValue + (s * b * h_ff * bytesPerValue) // inputs of 1st/2nd linear layers + + s * b * h_ff * bytesPerValue // inputs of activation function (not really necessary for Relu) + + s * b * h); // dropout + } else if (ff_activation === "swiglu") { + oneLayerFeedforward = (s * b * h * bytesPerValue + (s * b * h_ff * bytesPerValue) // inputs of input/output linear layers + + s * b * h_ff * bytesPerValue * 3 // inputs of activation function + + s * b * h); // dropout (note that dropout is lower-precision - boolean) + } + + const layerNorm = s * b * h * bytesPerValue; + + const inputDropout = s * b * h; // section 4.3 + const outputLayerNorm = s * b * h * bytesPerValue; + const outputLayerProjection = s * b * h * bytesPerValue; + const outputCrossEntropy = s * b * v * 4; // In FP32 + + + let oneLayer; + if (recomputation === "none") { + oneLayer = oneLayerAttention + oneLayerFeedforward + 2 * layerNorm; // eq (2) + } else if (recomputation === "selective") { + oneLayer = s * b * h * 34; // eq (6) + } else if (recomputation === "full") { + oneLayer = s * b * h * 2; + } else { + throw new Error("Invalid recomputation value"); + } + + const data = { + name: "activationMemory", + children: [ + ...Array.from({ length: L }, (_, index) => ({ + name: `Layer ${index + 1}`, + children: [ + { name: 'Attention', value: oneLayerAttention }, + { name: 'Feedforward', value: oneLayerFeedforward }, + { name: 'LayerNorm', value: 2 * layerNorm }, + ] + })), + { name: 'Dropout', value: inputDropout }, + { name: 'LayerNorm', value: outputLayerNorm }, + { name: 'Projection', value: outputLayerProjection }, + { name: 'Cross Entropy', value: outputCrossEntropy } + ] + }; + + const total = L * oneLayer + inputDropout + outputLayerNorm + outputLayerProjection + outputCrossEntropy; + + return data; +} + +export function paramGradsOpt(h, L, s, v, k = 8, mixed = true) { + console.log('paramGradsOpt called with:', { h, L, s, v, k, mixed }); + const emb = h * (v + s); + const oneLayer = 12 * h ** 2 + 13 * h; + const other = 2 * h; + + const n = emb + L * oneLayer + other; + + if (mixed) { + k += 4; + } + const bytesPerParameter = mixed ? 2 : 4; + + const result = [bytesPerParameter * n, bytesPerParameter * n, k * n]; + console.log('paramGradsOpt result:', result); + return result; +} + +export function updateGraph() { + console.log('updateGraph called'); + const a = +document.getElementById('a').value; + const b = +document.getElementById('b').value; + const h = +document.getElementById('h').value; + const h_ff = +document.getElementById('h_ff').value; + const L = +document.getElementById('L').value; + const s = +document.getElementById('s').value; + const v = +document.getElementById('v').value; + const mixed = document.getElementById('mixed').checked; + const recomputation = document.getElementById('recomputation').value; + const ff_activation = document.getElementById('ff_activation').value; + + console.log('Slider values:', { a, b, h, h_ff, L, s, v, mixed, recomputation, ff_activation }); + + const fixedSize100GB = 100 * 1024 * 1024 * 1024; // 100GB in bytes + const activationMemoryData = activationMemory(a, b, h, h_ff, L, s, v, mixed, recomputation, ff_activation); + const paramGradsOptValue = paramGradsOpt(h, L, s, v)[0]; + + const data = { + name: "root", + children: [ + { + name: 'Total', + value: 0, + children: [ + activationMemoryData, + { name: 'paramGradsOpt', value: paramGradsOptValue } + ] + } + ] + }; + + console.log('Data for treemap:', data); + + const width = 700; + const height = 450; + const legendHeight = 50; + + const svg = d3.select("#graph").select("svg"); + svg.selectAll("*").remove(); + svg.attr("width", width) + .attr("height", height + legendHeight); + + const treemap = d3.treemap() + .size([width, height]) + .paddingOuter(3) + .paddingTop(19) + .paddingInner(1) + .round(true); + + const root = d3.hierarchy(data) + .sum(d => d.value); + // .sort((a, b) => b.value - a.value); + + if (root.children[0].value < fixedSize100GB) { + root.children[0].value = fixedSize100GB; + } + + console.log('Treemap root:', root); + + treemap(root); + + const color = d => { + switch(d.data.name) { + case 'paramGradsOpt': return '#4e79a7'; // Blue + case 'activationMemory': return '#f28e2c'; // Orange + case 'fixed100GB': return '#59a14f'; // Green + case 'Attention': return '#e15759'; // Red + case 'Feedforward': return '#f28e2c'; // Orange + case 'LayerNorm': return '#9b59b6'; // Purple + case 'Dropout': return '#e15759'; // Red + case 'Projection': return '#f28e2c'; // Orange + case 'Cross Entropy': return '#e15759'; // Red + default: return '#59a14f'; // Red (for unexpected cases) + } + }; + + const cell = svg.selectAll("g") + .data(root.descendants()) + .join("g") + .attr("transform", d => `translate(${d.x0},${d.y0})`); + + cell.append("rect") + .attr("width", d => d.x1 - d.x0) + .attr("height", d => d.y1 - d.y0) + .attr("fill", d => d.depth === 1 ? "none" : color(d)) + .attr("stroke", d => d.depth === 1 ? color(d) : "none") + .attr("stroke-width", 2); + + const fontSize = 10; + const padding = 2; + + cell.append("text") + .attr("font-size", `${fontSize}px`) + .attr("font-family", "sans-serif") + .each(function(d) { + if (d.depth === 0) return; // Skip root node + + const node = d3.select(this); + + const name = d.data.name; + const value = formatBytes(d.value); + + if (d.depth === 1) { + // Parent node (fixed100GB) + node.attr("transform", `translate(${padding},${fontSize + padding})`) + .attr("font-weight", "bold") + .text(`${name}: ${value}`); + } else { + // Child nodes + node.attr("transform", `translate(${padding},${fontSize + padding})`) + .text(name[0].toUpperCase()) // Display only the first letter + .append("title") // Add title for hover effect + .text(`${name}: ${value}`); + } + }); + + // Add invisible rect for better hover area + cell.append("rect") + .attr("width", d => d.x1 - d.x0) + .attr("height", d => d.y1 - d.y0) + .attr("fill", "none") + .attr("pointer-events", "all") + .append("title") + .text(d => `${d.data.name}: ${formatBytes(d.value)}`); + + // Adjust legend positioning + const legendData = root.children[0].children.concat(root.children[0]); + const legend = svg.append("g") + .attr("font-family", "sans-serif") + .attr("font-size", 10) + .attr("text-anchor", "start") + .attr("transform", `translate(0, ${height})`) + .selectAll("g") + .data(legendData) + .join("g") + .attr("transform", (d, i) => `translate(${i * 240}, 0)`); + + legend.append("rect") + .attr("x", 0) + .attr("width", 19) + .attr("height", 19) + .attr("fill", d => d.data.name === 'fixed100GB' ? 'none' : color(d)) + .attr("stroke", d => d.data.name === 'fixed100GB' ? color(d) : 'none') + .attr("stroke-width", 2); + + legend.append("text") + .attr("x", 24) + .attr("y", 9.5) + .attr("dy", "0.32em") + .text(d => `${d.data.name}: ${formatBytes(d.value)}`); + + console.log('Treemap nodes created'); +} + +function formatBytes(bytes) { + const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB']; + if (bytes === 0) return '0 Bytes'; + const i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)), 10); + return `${(bytes / (1024 ** i)).toFixed(2)} ${sizes[i]}`; +} + +const presets = { + "Tiny": { a: 16, b: 3, h: 1024, h_ff: 4096, L: 1, s: 7, v: 30522, mixed: true, recomputation: "none", ff_activation: "gelu" }, + "8B": { a: 32, b: 32, h: 4096, h_ff: 16384, L: 32, s: 256, v: 30522, mixed: true, recomputation: "none", ff_activation: "swiglu" }, + "70B": { a: 64, b: 32, h: 8192, h_ff: 32768, L: 80, s: 256, v: 30522, mixed: true, recomputation: "none", ff_activation: "swiglu" }, + "405B": { a: 128, b: 32, h: 16384, h_ff: 65536, L: 126, s: 256, v: 30522, mixed: true, recomputation: "none", ff_activation: "swiglu" } +}; + +function setPresetValues(preset) { + if (preset === "custom") return; + + const values = presets[preset]; + Object.keys(values).forEach(key => { + const element = document.getElementById(key); + const inputElement = document.getElementById(`${key}_input`); + if (element) { + if (element.type === 'checkbox') { + element.checked = values[key]; + } else { + element.value = values[key]; + } + } + if (inputElement) { + inputElement.value = values[key]; + } + }); + + updateGraph(); +} + +function syncSliderAndInput(sliderId, inputId) { + const slider = document.getElementById(sliderId); + const input = document.getElementById(inputId); + + slider.addEventListener('input', () => { + input.value = slider.value; + updateGraph(); + }); + + input.addEventListener('input', () => { + let value = parseInt(input.value); + if (isNaN(value)) { + value = parseInt(slider.min); + } + value = Math.max(parseInt(slider.min), Math.min(parseInt(slider.max), value)); + slider.value = value; + input.value = value; + updateGraph(); + }); +} + +export const init_memory_plot = function () { + console.log('DOM fully loaded and parsed'); + + const sliderIds = ['a', 'b', 'h', 'h_ff', 'L', 's', 'v']; // Added 'v' + sliderIds.forEach(id => { + syncSliderAndInput(id, `${id}_input`); + }); + + const recomputationSelect = document.getElementById('recomputation'); + recomputationSelect.addEventListener('change', updateGraph); + + const ffActivationSelect = document.getElementById('ff_activation'); + ffActivationSelect.addEventListener('change', updateGraph); + + const mixedCheckbox = document.getElementById('mixed'); + mixedCheckbox.addEventListener('change', updateGraph); + + const presetSelect = document.getElementById('presets'); + presetSelect.addEventListener('change', (event) => { + setPresetValues(event.target.value); + }); + + // Set max values for sliders based on the highest values in the presets + document.getElementById('a').max = 128; + document.getElementById('b').max = 53248; + document.getElementById('h').max = 16384; + document.getElementById('h_ff').max = 65536; + document.getElementById('L').max = 126; + document.getElementById('s').max = 128000; + document.getElementById('v').max = 100000; // Set a reasonable max for vocabulary size + + console.log('Adding svg'); + const svg = d3.select("#graph") + .append("svg") + .attr("width", 960) + .attr("height", 500); + + updateGraph(); +}; \ No newline at end of file