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<!DOCTYPE html><html lang="en"><head><link rel="stylesheet" href="./style.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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}</script></head><body onload="loader()" class="card-page"><a href="https://github.com/30-seconds/30-seconds-of-code" class="github-corner" aria-label="View source on Github"><svg width="56" height="56" viewBox="0 0 250 250" style="fill:#009688;color:#fff;position:fixed;top:0;border:0;right:0;z-index:1000" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin:130px 106px" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><button class="menu-button"></button><header><h1 class="logo"><a href="./index"><img src="https://30secondsofcode.org/logos/logo_256.png" alt="logo"/><span id="title">&nbsp;30 seconds of code</span> <small>Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.</small></a></h1></header><div class="container card-container"><input class="search" type="search" id="searchInput" onkeyup="search(this)" placeholder="Search..." aria-label="Snippet search"><nav><h4 class="collapse">Adapter</h4><ul><li><a tags="adapter,function,intermediate" href="./adapter#ary">ary</a></li><li><a tags="adapter,function,intermediate" href="./adapter#call">call</a></li><li><a tags="adapter,function,array,intermediate" href="./adapter#collectinto">collectInto</a></li><li><a tags="adapter,function,intermediate" href="./adapter#flip">flip</a></li><li><a tags="adapter,function,intermediate" href="./adapter#over">over</a></li><li><a tags="adapter,function,intermediate" href="./adapter#overargs">overArgs</a></li><li><a tags="adapter,function,promise,intermediate" href="./adapter#pipeasyncfunctions">pipeAsyncFunctions</a></li><li><a tags="adapter,function,intermediate" href="./adapter#pipefunctions">pipeFunctions</a></li><li><a tags="adapter,function,promise,intermediate" href="./adapter#promisify">promisify</a></li><li><a tags="adapter,function,intermediate" href="./adapter#rearg">rearg</a></li><li><a tags="adapter,intermediate" href="./adapter#spreadover">spreadOver</a></li><li><a tags="adapter,function,intermediate" href="./adapter#unary">unary</a></li></ul><h4 class="collapse">Array</h4><ul><li><a tags="array,function,beginner" href="./index#all">all</a></li><li><a tags="array,function,beginner" href="./index#allequal">allEqual</a></li><li><a tags="array,function,beginner" href="./index#any">any</a></li><li><a tags="array,string,utility,intermediate" href="./index#arraytocsv">arrayToCSV</a></li><li><a tags="array,intermediate" href="./index#bifurcate">bifurcate</a></li><li><a tags="array,function,intermediate" href="./index#bifurcateby">bifurcateBy</a></li><li><a tags="array,intermediate" href="./index#chunk">chunk</a></li><li><a tags="array,beginner" href="./index#compact">compact</a></li><li><a tags="array,object,intermediate" href="./index#countby">countBy</a></li><li><a tags="array,intermediate" href="./index#countoccurrences">countOccurrences</a></li><li><a tags="array,recursion,intermediate" href="./index#deepflatten">deepFlatten</a></li><li><a tags="array,math,beginner" href="./index#difference">difference</a></li><li><a tags="array,function,intermediate" href="./index#differenceby">differenceBy</a></li><li><a tags="array,function,intermediate" href="./index#differencewith">differenceWith</a></li><li><a tags="array,beginner" href="./index#drop">drop</a></li><li><a tags="array,beginner" href="./index#dropright">dropRight</a></li><li><a tags="array,function,intermediate" href="./index#droprightwhile">dropRightWhile</a></li><li><a tags="array,function,intermediate" href="./index#dropwhile">dropWhile</a></li><li><a tags="array,beginner" href="./index#everynth">everyNth</a></li><li><a tags="array,beginner" href="./index#filterfalsy">filterFalsy</a></li><li><a tags="array,beginner" href="./index#filternonunique">filterNonUnique</a></li><li><a tags="array,function,intermediate" href="./index#filternonuniqueby">filterNonUniqueBy</a></li><li><a tags="array,beginner" href="./index#findlast">findLast</a></li><li><a tags="array,function,intermediate" href="./index#findlastindex">findLastIndex</a></li><li><a tags="array,intermediate" href="./index#flatten">flatten</a></li><li><a tags="array,function,intermediate" href="./index#foreachright">forEachRight</a></li><li><a tags="array,object,intermediate" href="./index#groupby">groupBy</a></li><li><a tags="array,beginner" href="./index#head">head</a></li><li><a tags="array,intermediate" href="./index#indexofall">indexOfAll</a></li><li><a tags="array,beginner" href="./index#initial">initial</a></li><li><a tags="array,intermediate" href="./index#initialize2darray">initialize2DArray</a></li><li><a tags="array,math,intermediate" href="./index#initializearraywithrange">initializeArrayWithRange</a></li><li><a tags="array,math,intermediate" href="./index#initializearraywithrangeright">initializeArrayWithRangeRight</a></li><li><a tags="array,math,intermediate" href="./index#initializearraywithvalues">initializeArrayWithValues</a></li><li><a tags="array,recursion,intermediate" href="./index#initializendarray">initializeNDArray</a></li><li><a tags="array,math,intermediate" href="./index#intersection">intersection</a></li><li><a tags="array,function,intermediate" href="./index#intersectionby">intersectionBy</a></li><li><a tags="array,function,intermediate" href="./index#intersectionwith">intersectionWith</a></li><li><a tags="array,intermediate" href="./index#issorted">isSorted</a></li><li><a tags="array,intermediate" href="./index#join">join</a></li><li><a tags="array,string,object,advanced" href="./index#jsontocsv">JSONtoCSV</a></li><li><a tags="array,beginner" href="./index#last">last</a></li><li><a tags="array,string,utility,intermediate" href="./index#longestitem">longestItem</a></li><li><a tags="array,object,advanced" href="./index#mapobject">mapObject</a></li><li><a tags="array,math,beginner" href="./index#maxn">maxN</a></li><li><a tags="array,math,beginner" href="./index#minn">minN</a></li><li><a tags="array,function,beginner" href="./index#none">none</a></li><li><a tags="array,beginner" href="./index#nthelement">nthElement</a></li><li><a tags="array,beginner" href="./index#offset">offset</a></li><li><a tags="array,object,function,intermediate" href="./index#partition">partition</a></li><li><a tags="array,recursion,advanced" href="./index#permutations">permutations</a></li><li><a tags="array,intermediate" href="./index#pull">pull</a></li><li><a tags="array,advanced" href="./index#pullatindex">pullAtIndex</a></li><li><a tags="array,advanced" href="./index#pullatvalue">pullAtValue</a></li><li><a tags="array,function,advanced" href="./index#pullby">pullBy</a></li><li><a tags="array,intermediate" href="./index#reducedfilter">reducedFilter</a></li><li><a tags="array,function,intermediate" href="./index#reducesuccessive">reduceSuccessive</a></li><li><a tags="array,function,intermediate" href="./index#reducewhich">reduceWhich</a></li><li><a tags="array,beginner" href="./index#reject">reject</a></li><li><a tags="array,intermediate" href="./index#remove">remove</a></li><li><a tags="array,random,beginner" href="./index#sample">sample</a></li><li><a tags="array,random,intermediate" href="./index#samplesize">sampleSize</a></li><li><a tags="array,intermediate" href="./index#shank">shank</a></li><li><a tags="array,random,intermediate" href="./index#shuffle">shuffle</a></li><li><a tags="array,math,beginner" href="./index#similarity">similarity</a></li><li><a tags="array,math,intermediate" href="./index#sortedindex">sortedIndex</a></li><li><a tags="array,math,function,intermediate" href="./index#sortedindexby">sortedIndexBy</a></li><li><a tags="array,math,intermediate" href="./index#sortedlastindex">sortedLastIndex</a></li><li><a tags="array,math,function,intermediate" href="./index#sortedlastindexby">sortedLastIndexBy</a></li><li><a tags="array,sort,advanced,intermediate" href="./index#stablesort">stableSort</a></li><li><a tags="array,math,intermediate" href="./index#symmetricdifference">symmetricDifference</a></li><li><a tags="array,function,intermediate" href="./index#symmetricdifferenceby">symmetricDifferenceBy</a></li><li><a tags="array,function,intermediate" href="./index#symmetricdifferencewith">symmetricDifferenceWith</a></li><li><a tags="array,beginner" href="./index#tail">tail</a></li><li><a tags="array,beginner" href="./index#take">take</a></li><li><a tags="array,intermediate" href="./index#takeright">takeRight</a></li><li><a tags="array,function,intermediate" href="./index#takerightwhile">takeRightWhile</a></li><li><a tags="array,function,intermediate" href="./index#takewhile">takeWhile</a></li><li><a tags="array,intermediate" href="./index#tohash">toHash</a></li><li><a tags="array,math,beginner" href="./index#union">union</a></li><li><a tags="array,function,intermediate" href="./index#unionby">unionBy</a></li><li><a tags="array,function,intermediate" href="./index#unionwith">unionWith</a></li><li><a tags="array,beginner" href="./index#uniqueelements">uniqueElements</a></li><li><a tags="array,function,intermediate" href="./index#uniqueelementsby">uniqueElementsBy</a></li><li><a tags="array,function,intermediate" href="./index#uniqueelementsbyright">uniqueElementsByRight</a></li><li><a tags="array,math,intermediate" href="./index#uniquesymmetricdifference">uniqueSymmetricDifference</a></li><li><a tags="array,intermediate" href="./index#unzip">unzip</a></li><li><a tags="array,function,advanced" href="./index#unzipwith">unzipWith</a></li><li><a tags="array,beginner" href="./index#without">without</a></li><li><a tags="array,math,intermediate" href="./index#xprod">xProd</a></li><li><a tags="array,intermediate" href="./index#zip">zip</a></li><li><a tags="array,object,intermediate" href="./index#zipobject">zipObject</a></li><li><a tags="array,function,advanced" href="./index#zipwith">zipWith</a></li></ul><h4 class="collapse">Browser</h4><ul><li><a tags="browser,array,intermediate" href="./browser#arraytohtmllist">arrayToHtmlList</a></li><li><a tags="browser,intermediate" href="./browser#bottomvisible">bottomVisible</a></li><li><a tags="browser,string,advanced" href="./browser#copytoclipboard">copyToClipboard</a></li><li><a tags="browser,advanced" href="./browser#counter">counter</a></li><li><a tags="browser,utility,beginner" href="./browser#createelement">createElement</a></li><li><a tags="browser,event,advanced" href="./browser#createeventhub">createEventHub</a></li><li><a tags="browser,url,beginner" href="./browser#currenturl">currentURL</a></li><li><a tags="browser,intermediate" href="./browser#detectdevicetype">detectDeviceType</a></li><li><a tags="browser,intermediate" href="./browser#elementcontains">elementContains</a></li><li><a tags="browser,advanced" href="./browser#elementisvisibleinviewport">elementIsVisibleInViewport</a></li><li><a tags="browser,object,intermediate" href="./browser#formtoobject">formToObject</a></li><li><a tags="browser,beginner" href="./browser#getimages">getImages</a></li><li><a tags="browser,intermediate" href="./browser#getscrollposition">getScrollPosition</a></li><li><a tags="browser,css,beginner" href="./browser#getstyle">getStyle</a></li><li><a tags="browser,css,beginner" href="./browser#hasclass">hasClass</a></li><li><a tags="browser,utility,advanced,promise,advanced" href="./browser#hashbrowser">hashBrowser</a></li><li><a tags="browser,css,beginner" href="./browser#hide">hide</a></li><li><a tags="browser,url,intermediate" href="./browser#httpsredirect">httpsRedirect</a></li><li><a tags="browser,beginner" href="./browser#insertafter">insertAfter</a></li><li><a tags="browser,beginner" href="./browser#insertbefore">insertBefore</a></li><li><a tags="browser,beginner" href="./browser#isbrowsertabfocused">isBrowserTabFocused</a></li><li><a tags="browser,array,beginner" href="./browser#nodelisttoarray">nodeListToArray</a></li><li><a tags="browser,event,advanced" href="./browser#observemutations">observeMutations</a></li><li><a tags="browser,event,intermediate" href="./browser#off">off</a></li><li><a tags="browser,event,intermediate" href="./browser#on">on</a></li><li><a tags="browser,event,advanced" href="./browser#onuserinputchange">onUserInputChange</a></li><li><a tags="browser,utility,intermediate" href="./browser#prefix">prefix</a></li><li><a tags="browser,utility,intermediate" href="./browser#recordanimationframes">recordAnimationFrames</a></li><li><a tags="browser,url,beginner" href="./browser#redirect">redirect</a></li><li><a tags="browser,function,advanced,promise,url" href="./browser#runasync">runAsync</a></li><li><a tags="browser,intermediate" href="./browser#scrolltotop">scrollToTop</a></li><li><a tags="browser,string,intermediate" href="./browser#serializeform">serializeForm</a></li><li><a tags="browser,beginner" href="./browser#setstyle">setStyle</a></li><li><a tags="browser,css,beginner" href="./browser#show">show</a></li><li><a tags="browser,css,intermediate" href="./browser#smoothscroll">smoothScroll</a></li><li><a tags="browser,beginner" href="./browser#toggleclass">toggleClass</a></li><li><a tags="browser,event,intermediate" href="./browser#triggerevent">triggerEvent</a></li><li><a tags="browser,utility,random,intermediate" href="./browser#uuidgeneratorbrowser">UUIDGeneratorBrowser</a></li></ul><h4 class="collapse">Date</h4><ul><li><a tags="date,beginner" href="./date#dayofyear">dayOfYear</a></li><li><a tags="date,math,string,utility,intermediate" href="./date#formatduration">formatDuration</a></li><li><a tags="date,intermediate" href="./date#getcolontimefromdate">getColonTimeFromDate</a></li><li><a tags="date,intermediate" href="./date#getdaysdiffbetweendates">getDaysDiffBetweenDates</a></li><li><a tags="date,beginner" href="./date#getmeridiemsuffixofinteger">getMeridiemSuffixOfInteger</a></li><li><a tags="date,utility,beginner" href="./date#isafterdate">isAfterDate</a></li><li><a tags="date,utility,beginner" href="./date#isbeforedate">isBeforeDate</a></li><li><a tags="date,utility,beginner" href="./date#issamedate">isSameDate</a></li><li><a tags="date,beginner" href="./date#isweekday">isWeekday</a></li><li><a tags="date,beginner" href="./date#isweekend">isWeekend</a></li><li><a tags="date,math,beginner" href="./date#maxdate">maxDate</a></li><li><a tags="date,math,beginner" href="./date#mindate">minDate</a></li><li><a tags="date,intermediate" href="./date#tomorrow">tomorrow</a></li><li><a tags="date,intermediate" href="./date#yesterday">yesterday</a></li></ul><h4 class="collapse">Function</h4><ul><li><a tags="function,intermediate" href="./function#attempt">attempt</a></li><li><a tags="function,object,intermediate" href="./function#bind">bind</a></li><li><a tags="function,object,intermediate" href="./function#bindkey">bindKey</a></li><li><a tags="function,intermediate" href="./function#chainasync">chainAsync</a></li><li><a tags="function,object,utility,beginner" href="./function#checkprop">checkProp</a></li><li><a tags="function,intermediate" href="./function#compose">compose</a></li><li><a tags="function,intermediate" href="./function#composeright">composeRight</a></li><li><a tags="function,intermediate" href="./function#converge">converge</a></li><li><a tags="function,recursion,intermediate" href="./function#curry">curry</a></li><li><a tags="function,intermediate" href="./function#debounce">debounce</a></li><li><a tags="function,intermediate" href="./function#defer">defer</a></li><li><a tags="function,intermediate" href="./function#delay">delay</a></li><li><a tags="function,utility,beginner" href="./function#functionname">functionName</a></li><li><a tags="function,intermediate" href="./function#hz">hz</a></li><li><a tags="function,advanced" href="./function#memoize">memoize</a></li><li><a tags="function,beginner" href="./function#negate">negate</a></li><li><a tags="function,intermediate" href="./function#once">once</a></li><li><a tags="function,intermediate" href="./function#partial">partial</a></li><li><a tags="function,intermediate" href="./function#partialright">partialRight</a></li><li><a tags="function,promise,intermediate" href="./function#runpromisesinseries">runPromisesInSeries</a></li><li><a tags="function,promise,intermediate" href="./function#sleep">sleep</a></li><li><a tags="function,advanced" href="./function#throttle">throttle</a></li><li><a tags="function,intermediate" href="./function#times">times</a></li><li><a tags="function,intermediate" href="./function#uncurry">uncurry</a></li><li><a tags="function,array,intermediate" href="./function#unfold">unfold</a></li><li><a tags="function,intermediate" href="./function#when">when</a></li></ul><h4 class="collapse">Math</h4><ul><li><a tags="math,beginner" href="./math#approximatelyequal">approximatelyEqual</a></li><li><a tags="math,array,beginner" href="./math#average">average</a></li><li><a tags="math,array,function,intermediate" href="./math#averageby">averageBy</a></li><li><a tags="math,intermediate" href="./math#binomialcoefficient">binomialCoefficient</a></li><li><a tags="math,beginner" href="./math#clampnumber">clampNumber</a></li><li><a tags="math,beginner" href="./math#degreestorads">degreesToRads</a></li><li><a tags="math,array,beginner" href="./math#digitize">digitize</a></li><li><a tags="math,beginner" href="./math#distance">distance</a></li><li><a tags="math,array,advanced" href="./math#elo">elo</a></li><li><a tags="math,recursion,beginner" href="./math#factorial">factorial</a></li><li><a tags="math,array,beginner" href="./math#fibonacci">fibonacci</a></li><li><a tags="math,recursion,beginner" href="./math#gcd">gcd</a></li><li><a tags="math,intermediate" href="./math#geometricprogression">geometricProgression</a></li><li><a tags="math,beginner" href="./math#hammingdistance">hammingDistance</a></li><li><a tags="math,beginner" href="./math#inrange">inRange</a></li><li><a tags="math,beginner" href="./math#isdivisible">isDivisible</a></li><li><a tags="math,beginner" href="./math#iseven">isEven</a></li><li><a tags="math,utility,beginner" href="./math#isnegativezero">isNegativeZero</a></li><li><a tags="math,beginner,intermediate" href="./math#isprime">isPrime</a></li><li><a tags="math,recursion,beginner" href="./math#lcm">lcm</a></li><li><a tags="math,utility,advanced" href="./math#luhncheck">luhnCheck</a></li><li><a tags="math,beginner" href="./math#mapnumrange">mapNumRange</a></li><li><a tags="math,array,function,beginner" href="./math#maxby">maxBy</a></li><li><a tags="math,array,intermediate" href="./math#median">median</a></li><li><a tags="math,array,beginner" href="./math#midpoint">midpoint</a></li><li><a tags="math,array,function,beginner" href="./math#minby">minBy</a></li><li><a tags="math,intermediate" href="./math#percentile">percentile</a></li><li><a tags="math,beginner" href="./math#powerset">powerset</a></li><li><a tags="math,array,intermediate" href="./math#primes">primes</a></li><li><a tags="math,beginner" href="./math#radstodegrees">radsToDegrees</a></li><li><a tags="math,utility,random,intermediate" href="./math#randomintarrayinrange">randomIntArrayInRange</a></li><li><a tags="math,utility,random,beginner" href="./math#randomintegerinrange">randomIntegerInRange</a></li><li><a tags="math,utility,random,beginner" href="./math#randomnumberinrange">randomNumberInRange</a></li><li><a tags="math,intermediate" href="./math#round">round</a></li><li><a tags="math,utility,intermediate" href="./math#sdbm">sdbm</a></li><li><a tags="math,array,intermediate" href="./math#standarddeviation">standardDeviation</a></li><li><a tags="math,array,beginner" href="./math#sum">sum</a></li><li><a tags="math,array,function,intermediate" href="./math#sumby">sumBy</a></li><li><a tags="math,intermediate" href="./math#sumpower">sumPower</a></li><li><a tags="math,beginner" href="./math#tosafeinteger">toSafeInteger</a></li><li><a tags="math,beginner" href="./math#vectordistance">vectorDistance</a></li></ul><h4 class="collapse">Node</h4><ul><li><a tags="node,string,utility,beginner" href="#atob">atob</a></li><li><a tags="node,string,utility,beginner" href="#btoa">btoa</a></li><li><a tags="node,utility,string,intermediate" href="#colorize">colorize</a></li><li><a tags="node,beginner" href="#createdirifnotexists">createDirIfNotExists</a></li><li><a tags="node,intermediate" href="#hasflags">hasFlags</a></li><li><a tags="node,utility,promise,intermediate" href="#hashnode">hashNode</a></li><li><a tags="node,type,intermediate" href="#isduplexstream">isDuplexStream</a></li><li><a tags="node,type,intermediate" href="#isreadablestream">isReadableStream</a></li><li><a tags="node,type,intermediate" href="#isstream">isStream</a></li><li><a tags="node,intermediate" href="#istravisci">isTravisCI</a></li><li><a tags="node,type,intermediate" href="#iswritablestream">isWritableStream</a></li><li><a tags="node,json,intermediate" href="#jsontofile">JSONToFile</a></li><li><a tags="node,array,string,beginner" href="#readfilelines">readFileLines</a></li><li><a tags="node,string,beginner" href="#untildify">untildify</a></li><li><a tags="node,utility,random,intermediate" href="#uuidgeneratornode">UUIDGeneratorNode</a></li></ul><h4 class="collapse">Object</h4><ul><li><a tags="object,function,intermediate" href="./object#bindall">bindAll</a></li><li><a tags="object,recursion,intermediate" href="./object#deepclone">deepClone</a></li><li><a tags="object,recursion,intermediate" href="./object#deepfreeze">deepFreeze</a></li><li><a tags="object,intermediate" href="./object#deepget">deepGet</a></li><li><a tags="object,recursion,advanced" href="./object#deepmapkeys">deepMapKeys</a></li><li><a tags="object,intermediate" href="./object#defaults">defaults</a></li><li><a tags="object,recursion,intermediate" href="./object#dig">dig</a></li><li><a tags="object,array,type,advanced" href="./object#equals">equals</a></li><li><a tags="object,function,intermediate" href="./object#findkey">findKey</a></li><li><a tags="object,function,intermediate" href="./object#findlastkey">findLastKey</a></li><li><a tags="object,recursion,intermediate" href="./object#flattenobject">flattenObject</a></li><li><a tags="object,intermediate" href="./object#forown">forOwn</a></li><li><a tags="object,intermediate" href="./object#forownright">forOwnRight</a></li><li><a tags="object,function,intermediate" href="./object#functions">functions</a></li><li><a tags="object,intermediate" href="./object#get">get</a></li><li><a tags="object,function,intermediate" href="./object#invertkeyvalues">invertKeyValues</a></li><li><a tags="object,intermediate" href="./object#lowercasekeys">lowercaseKeys</a></li><li><a tags="object,function,intermediate" href="./object#mapkeys">mapKeys</a></li><li><a tags="object,function,intermediate" href="./object#mapvalues">mapValues</a></li><li><a tags="object,type,intermediate" href="./object#matches">matches</a></li><li><a tags="object,type,function,intermediate" href="./object#matcheswith">matchesWith</a></li><li><a tags="object,array,intermediate" href="./object#merge">merge</a></li><li><a tags="object,intermediate" href="./object#nest">nest</a></li><li><a tags="object,array,beginner" href="./object#objectfrompairs">objectFromPairs</a></li><li><a tags="object,array,beginner" href="./object#objecttopairs">objectToPairs</a></li><li><a tags="object,array,intermediate" href="./object#omit">omit</a></li><li><a tags="object,array,function,intermediate" href="./object#omitby">omitBy</a></li><li><a tags="object,array,intermediate" href="./object#orderby">orderBy</a></li><li><a tags="object,array,intermediate" href="./object#pick">pick</a></li><li><a tags="object,array,function,intermediate" href="./object#pickby">pickBy</a></li><li><a tags="object,intermediate" href="./object#renamekeys">renameKeys</a></li><li><a tags="object,beginner" href="./object#shallowclone">shallowClone</a></li><li><a tags="object,array,string,intermediate" href="./object#size">size</a></li><li><a tags="object,array,intermediate" href="./object#transform">transform</a></li><li><a tags="object,logic,array,intermediate" href="./object#truthcheckcollection">truthCheckCollection</a></li><li><a tags="object,advanced" href="./object#unflattenobject">unflattenObject</a></li></ul><h4 class="collapse">String</h4><ul><li><a tags="string,beginner" href="./string#bytesize">byteSize</a></li><li><a tags="string,array,intermediate" href="./string#capitalize">capitalize</a></li><li><a tags="string,regexp,intermediate" href="./string#capitalizeeveryword">capitalizeEveryWord</a></li><li><a tags="string,regexp,beginner" href="./string#compactwhitespace">compactWhitespace</a></li><li><a tags="string,array,utility,intermediate" href="./string#csvtoarray">CSVToArray</a></li><li><a tags="string,array,object,advanced" href="./string#csvtojson">CSVToJSON</a></li><li><a tags="string,array,intermediate" href="./string#decapitalize">decapitalize</a></li><li><a tags="string,browser,regexp,intermediate" href="./string#escapehtml">escapeHTML</a></li><li><a tags="string,regexp,intermediate" href="./string#escaperegexp">escapeRegExp</a></li><li><a tags="string,intermediate" href="./string#fromcamelcase">fromCamelCase</a></li><li><a tags="string,utility,beginner" href="./string#indentstring">indentString</a></li><li><a tags="string,utility,browser,url,intermediate" href="./string#isabsoluteurl">isAbsoluteURL</a></li><li><a tags="string,regexp,intermediate" href="./string#isanagram">isAnagram</a></li><li><a tags="string,utility,beginner" href="./string#islowercase">isLowerCase</a></li><li><a tags="string,utility,beginner" href="./string#isuppercase">isUpperCase</a></li><li><a tags="string,array,function,utility,beginner" href="./string#mapstring">mapString</a></li><li><a tags="string,utility,regexp,intermediate" href="./string#mask">mask</a></li><li><a tags="string,beginner" href="./string#pad">pad</a></li><li><a tags="string,intermediate" href="./string#palindrome">palindrome</a></li><li><a tags="string,intermediate" href="./string#pluralize">pluralize</a></li><li><a tags="string,regexp,intermediate" href="./string#removenonascii">removeNonASCII</a></li><li><a tags="string,array,beginner" href="./string#reversestring">reverseString</a></li><li><a tags="string,beginner" href="./string#sortcharactersinstring">sortCharactersInString</a></li><li><a tags="string,beginner" href="./string#splitlines">splitLines</a></li><li><a tags="string,recursion,advanced" href="./string#stringpermutations">stringPermutations</a></li><li><a tags="string,utility,regexp,beginner" href="./string#striphtmltags">stripHTMLTags</a></li><li><a tags="string,regexp,intermediate" href="./string#tocamelcase">toCamelCase</a></li><li><a tags="string,regexp,intermediate" href="./string#tokebabcase">toKebabCase</a></li><li><a tags="string,regexp,intermediate" href="./string#tosnakecase">toSnakeCase</a></li><li><a tags="string,regepx,intermediate" href="./string#totitlecase">toTitleCase</a></li><li><a tags="string,beginner" href="./string#truncatestring">truncateString</a></li><li><a tags="string,browser,beginner" href="./string#unescapehtml">unescapeHTML</a></li><li><a tags="string,utility,regexp,advanced" href="./string#urljoin">URLJoin</a></li><li><a tags="string,regexp,intermediate" href="./string#words">words</a></li></ul><h4 class="collapse">Type</h4><ul><li><a tags="type,beginner" href="./type#gettype">getType</a></li><li><a tags="type,array,regexp,beginner" href="./type#is">is</a></li><li><a tags="type,array,intermediate" href="./type#isarraylike">isArrayLike</a></li><li><a tags="type,beginner" href="./type#isboolean">isBoolean</a></li><li><a tags="type,array,object,string,beginner" href="./type#isempty">isEmpty</a></li><li><a tags="type,function,beginner" href="./type#isfunction">isFunction</a></li><li><a tags="type,beginner" href="./type#isnil">isNil</a></li><li><a tags="type,beginner" href="./type#isnull">isNull</a></li><li><a tags="type,math,beginner" href="./type#isnumber">isNumber</a></li><li><a tags="type,object,beginner" href="./type#isobject">isObject</a></li><li><a tags="type,object,beginner" href="./type#isobjectlike">isObjectLike</a></li><li><a tags="type,object,intermediate" href="./type#isplainobject">isPlainObject</a></li><li><a tags="type,function,array,string,intermediate" href="./type#isprimitive">isPrimitive</a></li><li><a tags="type,function,promise,intermediate" href="./type#ispromiselike">isPromiseLike</a></li><li><a tags="type,string,beginner" href="./type#isstring">isString</a></li><li><a tags="type,beginner" href="./type#issymbol">isSymbol</a></li><li><a tags="type,beginner" href="./type#isundefined">isUndefined</a></li><li><a tags="type,json,intermediate" href="./type#isvalidjson">isValidJSON</a></li></ul><h4 class="collapse">Utility</h4><ul><li><a tags="utility,array,type,beginner" href="./utility#castarray">castArray</a></li><li><a tags="utility,regexp,intermediate" href="./utility#cloneregexp">cloneRegExp</a></li><li><a tags="utility,beginner" href="./utility#coalesce">coalesce</a></li><li><a tags="utility,intermediate" href="./utility#coalescefactory">coalesceFactory</a></li><li><a tags="utility,string,intermediate" href="./utility#extendhex">extendHex</a></li><li><a tags="utility,browser,string,url,intermediate" href="./utility#geturlparameters">getURLParameters</a></li><li><a tags="utility,string,math,advanced" href="./utility#hextorgb">hexToRGB</a></li><li><a tags="utility,url,browser,intermediate" href="./utility#httpget">httpGet</a></li><li><a tags="utility,url,browser,intermediate" href="./utility#httppost">httpPost</a></li><li><a tags="utility,browser,intermediate" href="./utility#isbrowser">isBrowser</a></li><li><a tags="utility,function" href="./utility#mostperformant">mostPerformant</a></li><li><a tags="utility,function,beginner" href="./utility#ntharg">nthArg</a></li><li><a tags="utility,string,intermediate" href="./utility#parsecookie">parseCookie</a></li><li><a tags="utility,string,math,advanced" href="./utility#prettybytes">prettyBytes</a></li><li><a tags="utility,random,beginner" href="./utility#randomhexcolorcode">randomHexColorCode</a></li><li><a tags="utility,intermediate" href="./utility#rgbtohex">RGBToHex</a></li><li><a tags="utility,string,intermediate" href="./utility#serializecookie">serializeCookie</a></li><li><a tags="utility,beginner" href="./utility#timetaken">timeTaken</a></li><li><a tags="utility,intermediate" href="./utility#tocurrency">toCurrency</a></li><li><a tags="utility,math,beginner" href="./utility#todecimalmark">toDecimalMark</a></li><li><a tags="utility,math,intermediate" href="./utility#toordinalsuffix">toOrdinalSuffix</a></li><li><a tags="utility,math,intermediate" href="./utility#validatenumber">validateNumber</a></li><li><a tags="utility,regexp,intermediate" href="./utility#yesno">yesNo</a></li></ul><h4 class="static-link"><a href="./archive">Archive</a></h4><h4 class="static-link"><a href="./glossary">Glossary</a></h4><h4 class="static-link"><a href="./contributing">Contributing</a></h4><h4 class="static-link"><a href="./about">About</a></h4><div><button class="social fb"></button><button class="social instagram"></button><button class="social twitter"></button></div></nav><main class="col-centered"><span id="top"><br/><br/></span><h2 class="category-name">Node</h2><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="atob">atob</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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> Buffer<span class="token punctuation">.</span><span class="token keyword">from</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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="btoa">btoa</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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> Buffer<span class="token punctuation">.</span><span class="token keyword">from</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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="colorize">colorize</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="createdirifnotexists">createDirIfNotExists</h4><p>Creates a directory, if it does not exist.</p><p>Use <code>fs.existsSync()</code> to check if the directory exists, <code>fs.mkdirSync()</code> to create it.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">createDirIfNotExists</span> <span class="token operator">=</span> dir <span class="token operator">=></span> <span class="token punctuation">(</span><span class="token operator">!</span>fs<span class="token punctuation">.</span><span class="token function">existsSync</span><span class="token punctuation">(</span>dir<span class="token punctuation">)</span> <span class="token operator">?</span> fs<span class="token punctuation">.</span><span class="token function">mkdirSync</span><span class="token punctuation">(</span>dir<span class="token punctuation">) :</span> undefined<span class="token punctuation">);</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">createDirIfNotExists</span><span class="token punctuation">(</span><span class="token string">'test'</span><span class="token punctuation">);</span> <span class="token comment">// creates the directory 'test', if it doesn't exist</span>
</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="hasflags">hasFlags</h4><p>Check if the current process's arguments contain the specified flags.</p><p>Use <code>Array.prototype.every()</code> and <code>Array.prototype.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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="hashnode">hashNode</h4><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, <code>setTimeout</code> to prevent blocking on a long operation, and a <code>Promise</code> to give it a familiar interface.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="isduplexstream">isDuplexStream</h4><p>Checks if the given argument is a duplex (readable and writable) stream.</p><p>Check if the value is different from <code>null</code>, use <code>typeof</code> to check if a value is of type <code>object</code> and the <code>pipe</code> property is of type <code>function</code>. Additionally check if the <code>typeof</code> the <code>_read</code>, <code>_write</code> and <code>_readableState</code>, <code>_writableState</code> properties are <code>function</code> and <code>object</code> respectively.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isDuplexStream</span> <span class="token operator">=</span> val <span class="token operator">=></span>
val <span class="token operator">!==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>pipe <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_read <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_readableState <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_write <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_writableState <span class="token operator">===</span> <span class="token string">'object'</span><span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token keyword">const</span> Stream <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'stream'</span><span class="token punctuation">);</span>
<span class="token function">isDuplexStream</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Stream<span class="token punctuation">.</span>Duplex</span><span class="token punctuation">());</span> <span class="token comment">// true</span>
</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="isreadablestream">isReadableStream</h4><p>Checks if the given argument is a readable stream.</p><p>Check if the value is different from <code>null</code>, use <code>typeof</code> to check if the value is of type <code>object</code> and the <code>pipe</code> property is of type <code>function</code>. Additionally check if the <code>typeof</code> the <code>_read</code> and <code>_readableState</code> properties are <code>function</code> and <code>object</code> respectively.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isReadableStream</span> <span class="token operator">=</span> val <span class="token operator">=></span>
val <span class="token operator">!==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>pipe <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_read <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_readableState <span class="token operator">===</span> <span class="token string">'object'</span><span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples 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 function">isReadableStream</span><span class="token punctuation">(</span>fs<span class="token punctuation">.</span><span class="token function">createReadStream</span><span class="token punctuation">(</span><span class="token string">'test.txt'</span><span class="token punctuation">));</span> <span class="token comment">// true</span>
</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="isstream">isStream</h4><p>Checks if the given argument is a stream.</p><p>Check if the value is different from <code>null</code>, use <code>typeof</code> to check if the value is of type <code>object</code> and the <code>pipe</code> property is of type <code>function</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isStream</span> <span class="token operator">=</span> val <span class="token operator">=></span> val <span class="token operator">!==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> val<span class="token punctuation">.</span>pipe <span class="token operator">===</span> <span class="token string">'function'</span><span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples 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 function">isStream</span><span class="token punctuation">(</span>fs<span class="token punctuation">.</span><span class="token function">createReadStream</span><span class="token punctuation">(</span><span class="token string">'test.txt'</span><span class="token punctuation">));</span> <span class="token comment">// true</span>
</pre></div><div class="card code-card"><div class="section card-content"><h4><a href="https://frontendmasters.com/courses/javascript-hard-parts/" target="_blank" rel="noopener noreferrer">Recommended Resource - JavaScript: The Hard Parts</a></h4><p>Take your JavaScript to the next level. Gain an understanding of callbacks, higher order functions, closure, asynchronous and object-oriented JavaScript!</p></div></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="istravisci">isTravisCI</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="iswritablestream">isWritableStream</h4><p>Checks if the given argument is a writable stream.</p><p>Check if the value is different from <code>null</code>, use <code>typeof</code> to check if the value is of type <code>object</code> and the <code>pipe</code> property is of type <code>function</code>. Additionally check if the <code>typeof</code> the <code>_write</code> and <code>_writableState</code> properties are <code>function</code> and <code>object</code> respectively.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isWritableStream</span> <span class="token operator">=</span> val <span class="token operator">=></span>
val <span class="token operator">!==</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>pipe <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_write <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">&amp;&amp;</span>
<span class="token keyword">typeof</span> val<span class="token punctuation">.</span>_writableState <span class="token operator">===</span> <span class="token string">'object'</span><span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples 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 function">isWritableStream</span><span class="token punctuation">(</span>fs<span class="token punctuation">.</span><span class="token function">createWriteStream</span><span class="token punctuation">(</span><span class="token string">'test.txt'</span><span class="token punctuation">));</span> <span class="token comment">// true</span>
</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="jsontofile">JSONToFile</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="readfilelines">readFileLines</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="untildify">untildify</h4><p>Converts a tilde path to an absolute path.</p><p>Use <code>String.prototype.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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples 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></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="uuidgeneratornode">UUIDGeneratorNode</h4><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></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code 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">examples</label><pre class="section card-examples language-js"><span class="token function">UUIDGeneratorNode</span><span class="token punctuation">();</span> <span class="token comment">// '79c7c136-60ee-40a2-beb2-856f1feabefc'</span>
</pre></div></main><footer class="col-full-width container"><div class="col-centered"><p style="display:inline-block"><strong>30 seconds of code</strong> is licensed under the <a href="https://github.com/30-seconds/30-seconds-of-code/blob/master/LICENSE">CC0-1.0</a> license.<br>Logos made by <a href="https://github.com/Chalarangelo">Angelos Chalaris</a> and ribbon made by <a href="https://github.com/tholman/github-corners">Tim Holman</a> are licensed under the <a href="https://opensource.org/licenses/MIT">MIT</a> license.</p><br/><p style="display:inline-block"><a href="./about">About</a>&nbsp;&nbsp;&nbsp;&nbsp;<a href="./contributing">Contributing</a>&nbsp;&nbsp;&nbsp;&nbsp;<a href="./archive">Archive</a>&nbsp;&nbsp;&nbsp;&nbsp;<a href="./glossary">Glossary</a></p></div></footer><a class="scroll-to-top" href="#top"></a></div></body></html>
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