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30secondsofcode bcced2bed7 Travis build: 76
2018-07-14 07:34:58 +00:00

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<!DOCTYPE html><html lang="en"><head><script async src="https://www.googletagmanager.com/gtag/js?id=UA-117141635-1"></script><script>function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag("js",new Date),gtag("config","UA-117141635-1")</script><link rel="stylesheet" href="./mini.css"><title>Node - 30 seconds of code</title><meta charset="utf-8"><meta name="description" content="Curated collection of useful Javascript snippets that you can understand in 30 seconds or less."><meta name="keywords" content="javascript, snippets, code, programming"><meta name="author" content="Angelos Chalaris (chalarangelo@gmail.com)"><meta name="viewport" content="width=device-width,initial-scale=1"><meta name="theme-color" content="#111"><meta property="og:title" content="30 seconds of code"><meta property="og:description" content="Curated collection of useful Javascript snippets that you can understand in 30 seconds or less."/><meta property="og:type" content="website"/><meta property="og:image" content="https://30secondsofcode.org/logos/logo_512.png"><link rel="icon" type="image/png" href="./logos/logo_128.png"><link rel="manifest" href="manifest.json"><script>const search = (node) => {
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useful JavaScript snippets that you can understand in 30 seconds or less.</small></a></h1><label for="doc-drawer-checkbox" class="button drawer-toggle" id="menu-toggle"></label></header><div class="row" style="height:calc(100vh - 3.5rem);overflow:hidden"><input id="doc-drawer-checkbox" class="drawer" value="on" type="checkbox"><nav class="col-md-4 col-lg-3" style="border-top:0"><div class="input-group vertical"><input class="search" type="text" id="searchInput" onkeyup="search(this)" placeholder="Search..."></div><h3>Adapter</h3><a class="sublink-1" tags="adapter,function" href="./adapter#ary">ary</a> <a class="sublink-1" tags="adapter,function" href="./adapter#call">call</a> <a class="sublink-1" tags="adapter,function,array" href="./adapter#collectinto">collectInto</a> <a class="sublink-1" tags="adapter,function" href="./adapter#flip">flip</a> <a class="sublink-1" tags="adapter,function" href="./adapter#over">over</a> <a class="sublink-1" tags="adapter,function" href="./adapter#overargs">overArgs</a> <a class="sublink-1" tags="adapter,function,promise" href="./adapter#pipeasyncfunctions">pipeAsyncFunctions</a> <a class="sublink-1" tags="adapter,function" href="./adapter#pipefunctions">pipeFunctions</a> <a class="sublink-1" tags="adapter,function,promise" href="./adapter#promisify">promisify</a> <a class="sublink-1" tags="adapter,function" href="./adapter#rearg">rearg</a> <a class="sublink-1" tags="adapter" href="./adapter#spreadover">spreadOver</a> <a class="sublink-1" tags="adapter,function" href="./adapter#unary">unary</a><h3>Array</h3><a class="sublink-1" tags="array,function" href="./array#all">all</a> <a class="sublink-1" tags="array,function" href="./array#any">any</a> <a class="sublink-1" tags="array,string,utility" href="./array#arraytocsv">arrayToCSV</a> <a class="sublink-1" tags="array" href="./array#bifurcate">bifurcate</a> <a class="sublink-1" tags="array,function" href="./array#bifurcateby">bifurcateBy</a> <a class="sublink-1" tags="array" href="./array#chunk">chunk</a> <a class="sublink-1" tags="array" href="./array#compact">compact</a> <a class="sublink-1" tags="array,object" href="./array#countby">countBy</a> <a class="sublink-1" tags="array" href="./array#countoccurrences">countOccurrences</a> <a class="sublink-1" tags="array,recursion" href="./array#deepflatten">deepFlatten</a> <a class="sublink-1" tags="array,math" href="./array#difference">difference</a> <a class="sublink-1" tags="array,function" href="./array#differenceby">differenceBy</a> <a class="sublink-1" tags="array,function" href="./array#differencewith">differenceWith</a> <a class="sublink-1" tags="array" href="./array#drop">drop</a> <a class="sublink-1" tags="array" href="./array#dropright">dropRight</a> <a class="sublink-1" tags="array,function" href="./array#droprightwhile">dropRightWhile</a> <a class="sublink-1" tags="array,function" href="./array#dropwhile">dropWhile</a> <a class="sublink-1" tags="array" href="./array#everynth">everyNth</a> <a class="sublink-1" tags="array" href="./array#filternonunique">filterNonUnique</a> <a class="sublink-1" tags="array" href="./array#findlast">findLast</a> <a class="sublink-1" tags="array,function" href="./array#findlastindex">findLastIndex</a> <a class="sublink-1" tags="array" href="./array#flatten">flatten</a> <a class="sublink-1" tags="array,function" href="./array#foreachright">forEachRight</a> <a class="sublink-1" tags="array,object" href="./array#groupby">groupBy</a> <a class="sublink-1" tags="array" href="./array#head">head</a> <a class="sublink-1" tags="array" href="./array#indexofall">indexOfAll</a> <a class="sublink-1" tags="array" href="./array#initial">initial</a> <a class="sublink-1" tags="array" href="./array#initialize2darray">initialize2DArray</a> <a class="sublink-1" tags="array,math" href="./array#initializearraywithrange">initializeArrayWithRange</a> <a class="sublink-1" tags="array,math" href="./array#initializearraywithrangeright">initializeArrayWithRangeRight</a> <a class="sublink-1" tags="array,math" href="./array#initializearraywithvalues">initializeArrayWithValues</a> <a class="sublink-1" tags="array,recursion" href="./array#initializendarray">initializeNDArray</a> <a class="sublink-1" tags="array,math" href="./array#intersection">intersection</a> <a class="sublink-1" tags="array,function" href="./array#intersectionby">intersectionBy</a> <a class="sublink-1" tags="array,function" href="./array#intersectionwith">intersectionWith</a> <a class="sublink-1" tags="array" href="./array#issorted">isSorted</a> <a class="sublink-1" tags="array" href="./array#join">join</a> <a class="sublink-1" tags="array,string,object,advanced" href="./array#jsontocsv">JSONtoCSV</a> <a class="sublink-1" tags="array" href="./array#last">last</a> <a class="sublink-1" tags="array,string,utility" href="./array#longestitem">longestItem</a> <a class="sublink-1" tags="array,object,advanced" href="./array#mapobject">mapObject</a> <a class="sublink-1" tags="array,math" href="./array#maxn">maxN</a> <a class="sublink-1" tags="array,math" href="./array#minn">minN</a> <a class="sublink-1" tags="array,function" href="./array#none">none</a> <a class="sublink-1" tags="array" href="./array#nthelement">nthElement</a> <a class="sublink-1" tags="array" href="./array#offset">offset</a> <a class="sublink-1" tags="array,object,function" href="./array#partition">partition</a> <a class="sublink-1" tags="array,recursion" href="./array#permutations">permutations</a> <a class="sublink-1" tags="array" href="./array#pull">pull</a> <a class="sublink-1" tags="array" href="./array#pullatindex">pullAtIndex</a> <a class="sublink-1" tags="array" href="./array#pullatvalue">pullAtValue</a> <a class="sublink-1" tags="array,function,advanced" href="./array#pullby">pullBy</a> <a class="sublink-1" tags="array" href="./array#reducedfilter">reducedFilter</a> <a class="sublink-1" tags="array,function" href="./array#reducesuccessive">reduceSuccessive</a> <a class="sublink-1" tags="array,function" href="./array#reducewhich">reduceWhich</a> <a class="sublink-1" tags="array" href="./array#reject">reject</a> <a class="sublink-1" tags="array" href="./array#remove">remove</a> <a class="sublink-1" tags="array,random" href="./array#sample">sample</a> <a class="sublink-1" tags="array,random" href="./array#samplesize">sampleSize</a> <a class="sublink-1" tags="array,random" href="./array#shuffle">shuffle</a> <a class="sublink-1" tags="array,math" href="./array#similarity">similarity</a> <a class="sublink-1" tags="array,math" href="./array#sortedindex">sortedIndex</a> <a class="sublink-1" tags="array,math,function" href="./array#sortedindexby">sortedIndexBy</a> <a class="sublink-1" tags="array,math" href="./array#sortedlastindex">sortedLastIndex</a> <a class="sublink-1" tags="array,math,function" href="./array#sortedlastindexby">sortedLastIndexBy</a> <a class="sublink-1" tags="array,sort,advanced" href="./array#stablesort">stableSort</a> <a class="sublink-1" tags="array,math" href="./array#symmetricdifference">symmetricDifference</a> <a class="sublink-1" tags="array,function" href="./array#symmetricdifferenceby">symmetricDifferenceBy</a> <a class="sublink-1" tags="array,function" href="./array#symmetricdifferencewith">symmetricDifferenceWith</a> <a class="sublink-1" tags="array" href="./array#tail">tail</a> <a class="sublink-1" tags="array" href="./array#take">take</a> <a class="sublink-1" tags="array" href="./array#takeright">takeRight</a> <a class="sublink-1" tags="array,function" href="./array#takerightwhile">takeRightWhile</a> <a class="sublink-1" tags="array,function" href="./array#takewhile">takeWhile</a> <a class="sublink-1" tags="array" href="./array#tohash">toHash</a> <a class="sublink-1" tags="array,math" href="./array#union">union</a> <a class="sublink-1" tags="array,function" href="./array#unionby">unionBy</a> <a class="sublink-1" tags="array,function" href="./array#unionwith">unionWith</a> <a class="sublink-1" tags="array" href="./array#uniqueelements">uniqueElements</a> <a class="sublink-1" tags="array" href="./array#unzip">unzip</a> <a class="sublink-1" tags="array,function,advanced" href="./array#unzipwith">unzipWith</a> <a class="sublink-1" tags="array" href="./array#without">without</a> <a class="sublink-1" tags="array,math" href="./array#xprod">xProd</a> <a class="sublink-1" tags="array" href="./array#zip">zip</a> <a class="sublink-1" tags="array,object" href="./array#zipobject">zipObject</a> <a class="sublink-1" tags="array,function,advanced" href="./array#zipwith">zipWith</a><h3>Browser</h3><a class="sublink-1" tags="browser,array" href="./browser#arraytohtmllist">arrayToHtmlList</a> <a class="sublink-1" tags="browser" href="./browser#bottomvisible">bottomVisible</a> <a class="sublink-1" tags="browser,string,advanced" href="./browser#copytoclipboard">copyToClipboard</a> <a class="sublink-1" tags="browser,advanced" href="./browser#counter">counter</a> <a class="sublink-1" tags="browser,utility" href="./browser#createelement">createElement</a> <a class="sublink-1" tags="browser,event,advanced" href="./browser#createeventhub">createEventHub</a> <a class="sublink-1" tags="browser,url" href="./browser#currenturl">currentURL</a> <a class="sublink-1" tags="browser" href="./browser#detectdevicetype">detectDeviceType</a> <a class="sublink-1" tags="browser" href="./browser#elementcontains">elementContains</a> <a class="sublink-1" tags="browser" href="./browser#elementisvisibleinviewport">elementIsVisibleInViewport</a> <a class="sublink-1" tags="browser" href="./browser#getscrollposition">getScrollPosition</a> <a class="sublink-1" tags="browser,css" href="./browser#getstyle">getStyle</a> <a class="sublink-1" tags="browser,css" href="./browser#hasclass">hasClass</a> <a class="sublink-1" tags="browser,utility,advanced,promise" href="./browser#hashbrowser">hashBrowser</a> <a class="sublink-1" tags="browser,css" href="./browser#hide">hide</a> <a class="sublink-1" tags="browser,url" href="./browser#httpsredirect">httpsRedirect</a> <a class="sublink-1" tags="browser" href="./browser#insertafter">insertAfter</a> <a class="sublink-1" tags="browser" href="./browser#insertbefore">insertBefore</a> <a class="sublink-1" tags="browser" href="./browser#isbrowsertabfocused">isBrowserTabFocused</a> <a class="sublink-1" tags="browser,array" href="./browser#nodelisttoarray">nodeListToArray</a> <a class="sublink-1" tags="browser,event,advanced" href="./browser#observemutations">observeMutations</a> <a class="sublink-1" tags="browser,event" href="./browser#off">off</a> <a class="sublink-1" tags="browser,event" href="./browser#on">on</a> <a class="sublink-1" tags="browser,event,advanced" href="./browser#onuserinputchange">onUserInputChange</a> <a class="sublink-1" tags="browser,utility" href="./browser#prefix">prefix</a> <a class="sublink-1" tags="browser,utility" href="./browser#recordanimationframes">recordAnimationFrames</a> <a class="sublink-1" tags="browser,url" href="./browser#redirect">redirect</a> <a class="sublink-1" tags="browser,function,advanced,promise,url" href="./browser#runasync">runAsync</a> <a class="sublink-1" tags="browser" href="./browser#scrolltotop">scrollToTop</a> <a class="sublink-1" tags="browser" href="./browser#setstyle">setStyle</a> <a class="sublink-1" tags="browser,css" href="./browser#show">show</a> <a class="sublink-1" tags="browser,css" href="./browser#smoothscroll">smoothScroll</a> <a class="sublink-1" tags="browser" href="./browser#toggleclass">toggleClass</a> <a class="sublink-1" tags="browser,event" href="./browser#triggerevent">triggerEvent</a> <a class="sublink-1" tags="browser,utility,random" href="./browser#uuidgeneratorbrowser">UUIDGeneratorBrowser</a><h3>Date</h3><a class="sublink-1" tags="date,math,string,utility" href="./date#formatduration">formatDuration</a> <a class="sublink-1" tags="date" href="./date#getcolontimefromdate">getColonTimeFromDate</a> <a class="sublink-1" tags="date" href="./date#getdaysdiffbetweendates">getDaysDiffBetweenDates</a> <a class="sublink-1" tags="date" href="./date#getmeridiemsuffixofinteger">getMeridiemSuffixOfInteger</a> <a class="sublink-1" tags="date" href="./date#tomorrow">tomorrow</a><h3>Function</h3><a class="sublink-1" tags="function" href="./function#attempt">attempt</a> <a class="sublink-1" tags="function,object" href="./function#bind">bind</a> <a class="sublink-1" tags="function,object" href="./function#bindkey">bindKey</a> <a class="sublink-1" tags="function" href="./function#chainasync">chainAsync</a> <a class="sublink-1" tags="function" href="./function#compose">compose</a> <a class="sublink-1" tags="function" href="./function#composeright">composeRight</a> <a class="sublink-1" tags="function" href="./function#converge">converge</a> <a class="sublink-1" tags="function,recursion" href="./function#curry">curry</a> <a class="sublink-1" tags="function" href="./function#debounce">debounce</a> <a class="sublink-1" tags="function" href="./function#defer">defer</a> <a class="sublink-1" tags="function" href="./function#delay">delay</a> <a class="sublink-1" tags="function,utility" href="./function#functionname">functionName</a> <a class="sublink-1" tags="function" href="./function#hz">hz</a> <a class="sublink-1" tags="function" href="./function#memoize">memoize</a> <a class="sublink-1" tags="function" href="./function#negate">negate</a> <a class="sublink-1" tags="function" href="./function#once">once</a> <a class="sublink-1" tags="function" href="./function#partial">partial</a> <a class="sublink-1" tags="function" href="./function#partialright">partialRight</a> <a class="sublink-1" tags="function,promise" href="./function#runpromisesinseries">runPromisesInSeries</a> <a class="sublink-1" tags="function,promise" href="./function#sleep">sleep</a> <a class="sublink-1" tags="function" href="./function#throttle">throttle</a> <a class="sublink-1" tags="function" href="./function#times">times</a> <a class="sublink-1" tags="function" href="./function#uncurry">uncurry</a> <a class="sublink-1" tags="function,array" href="./function#unfold">unfold</a> <a class="sublink-1" tags="function" href="./function#when">when</a><h3>Math</h3><a class="sublink-1" tags="math" href="./math#approximatelyequal">approximatelyEqual</a> <a class="sublink-1" tags="math,array" href="./math#average">average</a> <a class="sublink-1" tags="math,array,function" href="./math#averageby">averageBy</a> <a class="sublink-1" tags="math" href="./math#binomialcoefficient">binomialCoefficient</a> <a class="sublink-1" tags="math" href="./math#clampnumber">clampNumber</a> <a class="sublink-1" tags="math" href="./math#degreestorads">degreesToRads</a> <a class="sublink-1" tags="math,array" href="./math#digitize">digitize</a> <a class="sublink-1" tags="math" href="./math#distance">distance</a> <a class="sublink-1" tags="math,array,advanced" href="./math#elo">elo</a> <a class="sublink-1" tags="math,recursion" href="./math#factorial">factorial</a> <a class="sublink-1" tags="math,array" href="./math#fibonacci">fibonacci</a> <a class="sublink-1" tags="math,recursion" href="./math#gcd">gcd</a> <a class="sublink-1" tags="math" href="./math#geometricprogression">geometricProgression</a> <a class="sublink-1" tags="math" href="./math#hammingdistance">hammingDistance</a> <a class="sublink-1" tags="math" href="./math#inrange">inRange</a> <a class="sublink-1" tags="math" href="./math#isdivisible">isDivisible</a> <a class="sublink-1" tags="math" href="./math#iseven">isEven</a> <a class="sublink-1" tags="math" href="./math#isprime">isPrime</a> <a class="sublink-1" tags="math,recursion" href="./math#lcm">lcm</a> <a class="sublink-1" tags="math,utility" href="./math#luhncheck">luhnCheck</a> <a class="sublink-1" tags="math,array,function" href="./math#maxby">maxBy</a> <a class="sublink-1" tags="math,array" href="./math#median">median</a> <a class="sublink-1" tags="math,array,function" href="./math#minby">minBy</a> <a class="sublink-1" tags="math" href="./math#percentile">percentile</a> <a class="sublink-1" tags="math" href="./math#powerset">powerset</a> <a class="sublink-1" tags="math,array" href="./math#primes">primes</a> <a class="sublink-1" tags="math" href="./math#radstodegrees">radsToDegrees</a> <a class="sublink-1" tags="math,utility,random" href="./math#randomintarrayinrange">randomIntArrayInRange</a> <a class="sublink-1" tags="math,utility,random" href="./math#randomintegerinrange">randomIntegerInRange</a> <a class="sublink-1" tags="math,utility,random" href="./math#randomnumberinrange">randomNumberInRange</a> <a class="sublink-1" tags="math" href="./math#round">round</a> <a class="sublink-1" tags="math,utility" href="./math#sdbm">sdbm</a> <a class="sublink-1" tags="math,array" href="./math#standarddeviation">standardDeviation</a> <a class="sublink-1" tags="math,array" href="./math#sum">sum</a> <a class="sublink-1" tags="math,array,function" href="./math#sumby">sumBy</a> <a class="sublink-1" tags="math" href="./math#sumpower">sumPower</a> <a class="sublink-1" tags="math" href="./math#tosafeinteger">toSafeInteger</a><h3>Node</h3><a class="sublink-1" tags="node,string,utility" href="#atob">atob</a> <a class="sublink-1" tags="node,string,utility" href="#btoa">btoa</a> <a class="sublink-1" tags="node,utility,string" href="#colorize">colorize</a> <a class="sublink-1" tags="node" href="#hasflags">hasFlags</a> <a class="sublink-1" tags="node,utility,promise" href="#hashnode">hashNode</a> <a class="sublink-1" tags="node" href="#istravisci">isTravisCI</a> <a class="sublink-1" tags="node,json" href="#jsontofile">JSONToFile</a> <a class="sublink-1" tags="node,array,string" href="#readfilelines">readFileLines</a> <a class="sublink-1" tags="node,string" href="#untildify">untildify</a> <a class="sublink-1" tags="node,utility,random" href="#uuidgeneratornode">UUIDGeneratorNode</a><h3>Object</h3><a class="sublink-1" tags="object,function" href="./object#bindall">bindAll</a> <a class="sublink-1" tags="object,recursion" href="./object#deepclone">deepClone</a> <a class="sublink-1" tags="object" href="./object#defaults">defaults</a> <a class="sublink-1" tags="object,recursion" href="./object#dig">dig</a> <a class="sublink-1" tags="object,array,type,advanced" href="./object#equals">equals</a> <a class="sublink-1" tags="object,function" href="./object#findkey">findKey</a> <a class="sublink-1" tags="object,function" href="./object#findlastkey">findLastKey</a> <a class="sublink-1" tags="object,recursion" href="./object#flattenobject">flattenObject</a> <a class="sublink-1" tags="object" href="./object#forown">forOwn</a> <a class="sublink-1" tags="object" href="./object#forownright">forOwnRight</a> <a class="sublink-1" tags="object,function" href="./object#functions">functions</a> <a class="sublink-1" tags="object" href="./object#get">get</a> <a class="sublink-1" tags="object,function" href="./object#invertkeyvalues">invertKeyValues</a> <a class="sublink-1" tags="object" href="./object#lowercasekeys">lowercaseKeys</a> <a class="sublink-1" tags="object,function" href="./object#mapkeys">mapKeys</a> <a class="sublink-1" tags="object,function" href="./object#mapvalues">mapValues</a> <a class="sublink-1" tags="object,type" href="./object#matches">matches</a> <a class="sublink-1" tags="object,type,function" href="./object#matcheswith">matchesWith</a> <a class="sublink-1" tags="object,array" href="./object#merge">merge</a> <a class="sublink-1" tags="object" href="./object#nest">nest</a> <a class="sublink-1" tags="object,array" href="./object#objectfrompairs">objectFromPairs</a> <a class="sublink-1" tags="object,array" href="./object#objecttopairs">objectToPairs</a> <a class="sublink-1" tags="object,array" href="./object#omit">omit</a> <a class="sublink-1" tags="object,array,function" href="./object#omitby">omitBy</a> <a class="sublink-1" tags="object,array" href="./object#orderby">orderBy</a> <a class="sublink-1" tags="object,array" href="./object#pick">pick</a> <a class="sublink-1" tags="object,array,function" href="./object#pickby">pickBy</a> <a class="sublink-1" tags="object" href="./object#renamekeys">renameKeys</a> <a class="sublink-1" tags="object" href="./object#shallowclone">shallowClone</a> <a class="sublink-1" tags="object,array,string" href="./object#size">size</a> <a class="sublink-1" tags="object,array" href="./object#transform">transform</a> <a class="sublink-1" tags="object,logic,array" href="./object#truthcheckcollection">truthCheckCollection</a> <a class="sublink-1" tags="object,advanced" href="./object#unflattenobject">unflattenObject</a><h3>String</h3><a class="sublink-1" tags="string" href="./string#bytesize">byteSize</a> <a class="sublink-1" tags="string,array" href="./string#capitalize">capitalize</a> <a class="sublink-1" tags="string,regexp" href="./string#capitalizeeveryword">capitalizeEveryWord</a> <a class="sublink-1" tags="string,array,utility" href="./string#csvtoarray">CSVToArray</a> <a class="sublink-1" tags="string,array,object,advanced" href="./string#csvtojson">CSVToJSON</a> <a class="sublink-1" tags="string,array" href="./string#decapitalize">decapitalize</a> <a class="sublink-1" tags="string,browser,regexp" href="./string#escapehtml">escapeHTML</a> <a class="sublink-1" tags="string,regexp" href="./string#escaperegexp">escapeRegExp</a> <a class="sublink-1" tags="string" href="./string#fromcamelcase">fromCamelCase</a> <a class="sublink-1" tags="string,utility,browser,url" href="./string#isabsoluteurl">isAbsoluteURL</a> <a class="sublink-1" tags="string,regexp" href="./string#isanagram">isAnagram</a> <a class="sublink-1" tags="string,utility" href="./string#islowercase">isLowerCase</a> <a class="sublink-1" tags="string,utility" href="./string#isuppercase">isUpperCase</a> <a class="sublink-1" tags="string,utility,regexp" href="./string#mask">mask</a> <a class="sublink-1" tags="string" href="./string#pad">pad</a> <a class="sublink-1" tags="string" href="./string#palindrome">palindrome</a> <a class="sublink-1" tags="string" href="./string#pluralize">pluralize</a> <a class="sublink-1" tags="string,regexp" href="./string#removenonascii">removeNonASCII</a> <a class="sublink-1" tags="string,array" href="./string#reversestring">reverseString</a> <a class="sublink-1" tags="string" href="./string#sortcharactersinstring">sortCharactersInString</a> <a class="sublink-1" tags="string" href="./string#splitlines">splitLines</a> <a class="sublink-1" tags="string,recursion" href="./string#stringpermutations">stringPermutations</a> <a class="sublink-1" tags="string,utility,regexp" href="./string#striphtmltags">stripHTMLTags</a> <a class="sublink-1" tags="string,regexp" href="./string#tocamelcase">toCamelCase</a> <a class="sublink-1" tags="string,regexp" href="./string#tokebabcase">toKebabCase</a> <a class="sublink-1" tags="string,regexp" href="./string#tosnakecase">toSnakeCase</a> <a class="sublink-1" tags="string" href="./string#truncatestring">truncateString</a> <a class="sublink-1" tags="string,browser" href="./string#unescapehtml">unescapeHTML</a> <a class="sublink-1" tags="string,utility,regexp" href="./string#urljoin">URLJoin</a> <a class="sublink-1" tags="string,regexp" href="./string#words">words</a><h3>Type</h3><a class="sublink-1" tags="type" href="./type#gettype">getType</a> <a class="sublink-1" tags="type,array,regexp" href="./type#is">is</a> <a class="sublink-1" tags="type,array" href="./type#isarraylike">isArrayLike</a> <a class="sublink-1" tags="type" href="./type#isboolean">isBoolean</a> <a class="sublink-1" tags="type,array,object,string" href="./type#isempty">isEmpty</a> <a class="sublink-1" tags="type,function" href="./type#isfunction">isFunction</a> <a class="sublink-1" tags="type" href="./type#isnil">isNil</a> <a class="sublink-1" tags="type" href="./type#isnull">isNull</a> <a class="sublink-1" tags="type,math" href="./type#isnumber">isNumber</a> <a class="sublink-1" tags="type,object" href="./type#isobject">isObject</a> <a class="sublink-1" tags="type,object" href="./type#isobjectlike">isObjectLike</a> <a class="sublink-1" tags="type,object" href="./type#isplainobject">isPlainObject</a> <a class="sublink-1" tags="type,function,array,string" href="./type#isprimitive">isPrimitive</a> <a class="sublink-1" tags="type,function,promise" href="./type#ispromiselike">isPromiseLike</a> <a class="sublink-1" tags="type,string" href="./type#isstring">isString</a> <a class="sublink-1" tags="type" href="./type#issymbol">isSymbol</a> <a class="sublink-1" tags="type" href="./type#isundefined">isUndefined</a> <a class="sublink-1" tags="type,json" href="./type#isvalidjson">isValidJSON</a><h3>Utility</h3><a class="sublink-1" tags="utility,array,type" href="./utility#castarray">castArray</a> <a class="sublink-1" tags="utility,regexp" href="./utility#cloneregexp">cloneRegExp</a> <a class="sublink-1" tags="utility" href="./utility#coalesce">coalesce</a> <a class="sublink-1" tags="utility" href="./utility#coalescefactory">coalesceFactory</a> <a class="sublink-1" tags="utility,string" href="./utility#extendhex">extendHex</a> <a class="sublink-1" tags="utility,browser,string,url" href="./utility#geturlparameters">getURLParameters</a> <a class="sublink-1" tags="utility,string,math,advanced" href="./utility#hextorgb">hexToRGB</a> <a class="sublink-1" tags="utility,url,browser" href="./utility#httpget">httpGet</a> <a class="sublink-1" tags="utility,url,browser" href="./utility#httppost">httpPost</a> <a class="sublink-1" tags="utility,browser" href="./utility#isbrowser">isBrowser</a> <a class="sublink-1" tags="utility,function" href="./utility#mostperformant">mostPerformant</a> <a class="sublink-1" tags="utility,function" href="./utility#ntharg">nthArg</a> <a class="sublink-1" tags="utility,string" href="./utility#parsecookie">parseCookie</a> <a class="sublink-1" tags="utility,string,math" href="./utility#prettybytes">prettyBytes</a> <a class="sublink-1" tags="utility,random" href="./utility#randomhexcolorcode">randomHexColorCode</a> <a class="sublink-1" tags="utility" href="./utility#rgbtohex">RGBToHex</a> <a class="sublink-1" tags="utility,string" href="./utility#serializecookie">serializeCookie</a> <a class="sublink-1" tags="utility" href="./utility#timetaken">timeTaken</a> <a class="sublink-1" tags="utility" href="./utility#tocurrency">toCurrency</a> <a class="sublink-1" tags="utility,math" href="./utility#todecimalmark">toDecimalMark</a> <a class="sublink-1" tags="utility,math" href="./utility#toordinalsuffix">toOrdinalSuffix</a> <a class="sublink-1" tags="utility,math" href="./utility#validatenumber">validateNumber</a> <a class="sublink-1" tags="utility,regexp" href="./utility#yesno">yesNo</a></nav><main class="col-sm-12 col-md-8 col-lg-9" style="height:100%;overflow-y:auto;background:#eceef2;padding:0"><a id="top">&nbsp;</a><h2 style="text-align:center">Node</h2><div class="card fluid"><h3 id="atob" class="section double-padded">atob</h3><div class="section double-padded"><p>Decodes a string of data which has been encoded using base-64 encoding.</p><p>Create a <code>Buffer</code> for the given string with base-64 encoding and use <code>Buffer.toString('binary')</code> to return the decoded string.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">atob</span> <span class="token operator">=</span> str <span class="token operator">=></span> <span class="token keyword">new</span> <span class="token class-name">Buffer</span><span class="token punctuation">(</span>str<span class="token punctuation">,</span> <span class="token string">'base64'</span><span class="token punctuation">).</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token string">'binary'</span><span class="token punctuation">);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">atob</span><span class="token punctuation">(</span><span class="token string">'Zm9vYmFy'</span><span class="token punctuation">);</span> <span class="token comment">// 'foobar'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="btoa" class="section double-padded">btoa</h3><div class="section double-padded"><p>Creates a base-64 encoded ASCII string from a String object in which each character in the string is treated as a byte of binary data.</p><p>Create a <code>Buffer</code> for the given string with binary encoding and use <code>Buffer.toString('base64')</code> to return the encoded string.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">btoa</span> <span class="token operator">=</span> str <span class="token operator">=></span> <span class="token keyword">new</span> <span class="token class-name">Buffer</span><span class="token punctuation">(</span>str<span class="token punctuation">,</span> <span class="token string">'binary'</span><span class="token punctuation">).</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token string">'base64'</span><span class="token punctuation">);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">btoa</span><span class="token punctuation">(</span><span class="token string">'foobar'</span><span class="token punctuation">);</span> <span class="token comment">// 'Zm9vYmFy'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="colorize" class="section double-padded">colorize</h3><div class="section double-padded"><p>Add special characters to text to print in color in the console (combined with <code>console.log()</code>).</p><p>Use template literals and special characters to add the appropriate color code to the string output. For background colors, add a special character that resets the background color at the end of the string.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">colorize</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">({</span>
black<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[30m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
red<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[31m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
green<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[32m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
yellow<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[33m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
blue<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[34m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
magenta<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[35m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
cyan<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[36m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
white<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[37m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">,</span>
bgBlack<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[40m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgRed<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[41m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgGreen<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[42m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgYellow<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[43m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgBlue<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[44m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgMagenta<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[45m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgCyan<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[46m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span><span class="token punctuation">,</span>
bgWhite<span class="token punctuation">:</span> <span class="token template-string"><span class="token string">`\x1b[47m</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>args<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\x1b[0m`</span></span>
<span class="token punctuation">});</span>
</pre><label class="collapse">Show examples</label><pre class="language-js">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">colorize</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">).</span>red<span class="token punctuation">);</span> <span class="token comment">// 'foo' (red letters)</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">colorize</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">,</span> <span class="token string">'bar'</span><span class="token punctuation">).</span>bgBlue<span class="token punctuation">);</span> <span class="token comment">// 'foo bar' (blue background)</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">colorize</span><span class="token punctuation">(</span><span class="token function">colorize</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">).</span>yellow<span class="token punctuation">,</span> <span class="token function">colorize</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">).</span>green<span class="token punctuation">).</span>bgWhite<span class="token punctuation">);</span> <span class="token comment">// 'foo bar' (first word in yellow letters, second word in green letters, white background for both)</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="hasflags" class="section double-padded">hasFlags</h3><div class="section double-padded"><p>Check if the current process's arguments contain the specified flags.</p><p>Use <code>Array.every()</code> and <code>Array.includes()</code> to check if <code>process.argv</code> contains all the specified flags. Use a regular expression to test if the specified flags are prefixed with <code>-</code> or <code>--</code> and prefix them accordingly.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">hasFlags</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">...</span>flags<span class="token punctuation">)</span> <span class="token operator">=></span>
flags<span class="token punctuation">.</span><span class="token function">every</span><span class="token punctuation">(</span>flag <span class="token operator">=></span> process<span class="token punctuation">.</span>argv<span class="token punctuation">.</span><span class="token function">includes</span><span class="token punctuation">(</span><span class="token regex">/^-{1,2}/</span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>flag<span class="token punctuation">)</span> <span class="token operator">?</span> flag <span class="token punctuation">:</span> <span class="token string">'--'</span> <span class="token operator">+</span> flag<span class="token punctuation">));</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token comment">// node myScript.js -s --test --cool=true</span>
<span class="token function">hasFlags</span><span class="token punctuation">(</span><span class="token string">'-s'</span><span class="token punctuation">);</span> <span class="token comment">// true</span>
<span class="token function">hasFlags</span><span class="token punctuation">(</span><span class="token string">'--test'</span><span class="token punctuation">,</span> <span class="token string">'cool=true'</span><span class="token punctuation">,</span> <span class="token string">'-s'</span><span class="token punctuation">);</span> <span class="token comment">// true</span>
<span class="token function">hasFlags</span><span class="token punctuation">(</span><span class="token string">'special'</span><span class="token punctuation">);</span> <span class="token comment">// false</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="hashnode" class="section double-padded">hashNode</h3><div class="section double-padded"><p>Creates a hash for a value using the <a href="https://en.wikipedia.org/wiki/SHA-2">SHA-256</a> algorithm. Returns a promise.</p><p>Use <code>crypto</code> API to create a hash for the given value.</p><pre class="language-js"><span class="token keyword">const</span> crypto <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'crypto'</span><span class="token punctuation">);</span>
<span class="token keyword">const</span> <span class="token function-variable function">hashNode</span> <span class="token operator">=</span> val <span class="token operator">=></span>
<span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span>resolve <span class="token operator">=></span>
<span class="token function">setTimeout</span><span class="token punctuation">(
()</span> <span class="token operator">=></span>
<span class="token function">resolve</span><span class="token punctuation">(</span>
crypto
<span class="token punctuation">.</span><span class="token function">createHash</span><span class="token punctuation">(</span><span class="token string">'sha256'</span><span class="token punctuation">)
.</span><span class="token function">update</span><span class="token punctuation">(</span>val<span class="token punctuation">)
.</span><span class="token function">digest</span><span class="token punctuation">(</span><span class="token string">'hex'</span><span class="token punctuation">)
),</span>
<span class="token number">0</span>
<span class="token punctuation">)
);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">hashNode</span><span class="token punctuation">(</span><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">({</span> a<span class="token punctuation">:</span> <span class="token string">'a'</span><span class="token punctuation">,</span> b<span class="token punctuation">: [</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">],</span> foo<span class="token punctuation">: {</span> c<span class="token punctuation">:</span> <span class="token string">'bar'</span> <span class="token punctuation">} })).</span><span class="token function">then</span><span class="token punctuation">(</span>console<span class="token punctuation">.</span>log<span class="token punctuation">);</span> <span class="token comment">// '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="istravisci" class="section double-padded">isTravisCI</h3><div class="section double-padded"><p>Checks if the current environment is <a href="https://travis-ci.org/">Travis CI</a>.</p><p>Checks if the current environment has the <code>TRAVIS</code> and <code>CI</code> environment variables (<a href="https://docs.travis-ci.com/user/environment-variables/#Default-Environment-Variables">reference</a>).</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">isTravisCI</span> <span class="token operator">=</span> <span class="token punctuation">()</span> <span class="token operator">=></span> <span class="token string">'TRAVIS'</span> <span class="token keyword">in</span> process<span class="token punctuation">.</span>env <span class="token operator">&amp;&amp;</span> <span class="token string">'CI'</span> <span class="token keyword">in</span> process<span class="token punctuation">.</span>env<span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">isTravisCI</span><span class="token punctuation">();</span> <span class="token comment">// true (if code is running on Travis CI)</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="jsontofile" class="section double-padded">JSONToFile</h3><div class="section double-padded"><p>Writes a JSON object to a file.</p><p>Use <code>fs.writeFile()</code>, template literals and <code>JSON.stringify()</code> to write a <code>json</code> object to a <code>.json</code> file.</p><pre class="language-js"><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">);</span>
<span class="token keyword">const</span> <span class="token function-variable function">JSONToFile</span> <span class="token operator">=</span> <span class="token punctuation">(</span>obj<span class="token punctuation">,</span> filename<span class="token punctuation">)</span> <span class="token operator">=></span>
fs<span class="token punctuation">.</span><span class="token function">writeFile</span><span class="token punctuation">(</span><span class="token template-string"><span class="token string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>filename<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">.json`</span></span><span class="token punctuation">,</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">));</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">JSONToFile</span><span class="token punctuation">({</span> test<span class="token punctuation">:</span> <span class="token string">'is passed'</span> <span class="token punctuation">},</span> <span class="token string">'testJsonFile'</span><span class="token punctuation">);</span> <span class="token comment">// writes the object to 'testJsonFile.json'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="readfilelines" class="section double-padded">readFileLines</h3><div class="section double-padded"><p>Returns an array of lines from the specified file.</p><p>Use <code>readFileSync</code> function in <code>fs</code> node package to create a <code>Buffer</code> from a file. convert buffer to string using <code>toString(encoding)</code> function. creating an array from contents of file by <code>split</code>ing file content line by line (each <code>\n</code>).</p><pre class="language-js"><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">);</span>
<span class="token keyword">const</span> <span class="token function-variable function">readFileLines</span> <span class="token operator">=</span> filename <span class="token operator">=></span>
fs
<span class="token punctuation">.</span><span class="token function">readFileSync</span><span class="token punctuation">(</span>filename<span class="token punctuation">)
.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token string">'UTF8'</span><span class="token punctuation">)
.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">'\n'</span><span class="token punctuation">);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token comment">/*
contents of test.txt :
line1
line2
line3
___________________________
*/</span>
<span class="token keyword">let</span> arr <span class="token operator">=</span> <span class="token function">readFileLines</span><span class="token punctuation">(</span><span class="token string">'test.txt'</span><span class="token punctuation">);</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>arr<span class="token punctuation">);</span> <span class="token comment">// ['line1', 'line2', 'line3']</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="untildify" class="section double-padded">untildify</h3><div class="section double-padded"><p>Converts a tilde path to an absolute path.</p><p>Use <code>String.replace()</code> with a regular expression and <code>OS.homedir()</code> to replace the <code>~</code> in the start of the path with the home directory.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">untildify</span> <span class="token operator">=</span> str <span class="token operator">=></span> str<span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token regex">/^~($|\/|\\)/</span><span class="token punctuation">,</span> <span class="token template-string"><span class="token string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span><span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'os'</span><span class="token punctuation">).</span><span class="token function">homedir</span><span class="token punctuation">()</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">$1`</span></span><span class="token punctuation">);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">untildify</span><span class="token punctuation">(</span><span class="token string">'~/node'</span><span class="token punctuation">);</span> <span class="token comment">// '/Users/aUser/node'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="uuidgeneratornode" class="section double-padded">UUIDGeneratorNode</h3><div class="section double-padded"><p>Generates a UUID in Node.JS.</p><p>Use <code>crypto</code> API to generate a UUID, compliant with <a href="https://www.ietf.org/rfc/rfc4122.txt">RFC4122</a> version 4.</p><pre class="language-js"><span class="token keyword">const</span> crypto <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'crypto'</span><span class="token punctuation">);</span>
<span class="token keyword">const</span> <span class="token function-variable function">UUIDGeneratorNode</span> <span class="token operator">=</span> <span class="token punctuation">()</span> <span class="token operator">=></span>
<span class="token punctuation">([</span><span class="token number">1e7</span><span class="token punctuation">]</span> <span class="token operator">+ -</span><span class="token number">1e3</span> <span class="token operator">+ -</span><span class="token number">4e3</span> <span class="token operator">+ -</span><span class="token number">8e3</span> <span class="token operator">+ -</span><span class="token number">1e11</span><span class="token punctuation">).</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token regex">/[018]/g</span><span class="token punctuation">,</span> c <span class="token operator">=></span>
<span class="token punctuation">(</span>c <span class="token operator">^</span> <span class="token punctuation">(</span>crypto<span class="token punctuation">.</span><span class="token function">randomBytes</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token operator">&amp;</span> <span class="token punctuation">(</span><span class="token number">15</span> <span class="token operator">>></span> <span class="token punctuation">(</span>c <span class="token operator">/</span> <span class="token number">4</span><span class="token punctuation">)))).</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token number">16</span><span class="token punctuation">)
);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">UUIDGeneratorNode</span><span class="token punctuation">();</span> <span class="token comment">// '79c7c136-60ee-40a2-beb2-856f1feabefc'</span>
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