JavaScript snippets

536 short, self-contained JavaScript functions. Grouped by category below.

Arrays

Snippet		Snippet		Snippet
accumulate		aperture		arrayToCSV
arrayToHTMLList		bifurcate		bifurcateBy
castArray		chunk		chunkIntoN
chunkify		compact		countBy
countOccurrences		difference		differenceBy
differenceWith		drop		dropRight
dropRightWhile		dropWhile		everyNth
filterNonUnique		filterNonUniqueBy		filterUnique
filterUniqueBy		findFirstN		findLast
findLastIndex		findLastN		flatten
forEachRight		frequencies		groupBy
hasDuplicates		haveSameContents		head
includesAll		includesAny		indexBy
indexOfAll		initial		initialize2DArray
initializeArrayWithRange		initializeArrayWithRangeRight		initializeArrayWithValues
initializeNDArray		insertAt		intersection
intersectionBy		intersectionWith		isSorted
join		last		longestItem
mapConsecutive		maxBy		maxN
median		minBy		minN
mostFrequent		none		nthElement
objectFromPairs		offset		orderBy
orderWith		partition		partitionBy
percentile		permutations		pluck
pull		pullAtIndex		pullAtValue
pullBy		reducedFilter		reduceSuccessive
reduceWhich		reject		remove
sample		sampleSize		shank
shuffle		similarity		sortedIndex
sortedIndexBy		sortedLastIndex		sortedLastIndexBy
stableSort		subSet		sum
sumBy		sumN		superSet
symmetricDifference		symmetricDifferenceBy		symmetricDifferenceWith
tail		take		takeRight
takeRightUntil		takeRightWhile		takeUntil
takeWhile		union		unionBy
unionWith		uniqueElements		uniqueElementsBy
uniqueElementsByRight		uniqueSymmetricDifference		unzip
unzipWith		without		xProd
zip		zipObject		zipWith

Objects

Snippet		Snippet		Snippet
compactObject		deepClone		deepFreeze
deepGet		deepMapKeys		deepMerge
defaults		dig		equals
findKey		findKeys		findLastKey
flattenObject		forOwn		forOwnRight
get		hasKey		hasMany
hasOne		invertKeyValues		isDeepFrozen
isDisjoint		isObjectLike		isPlainObject
lowercaseKeys		mapKeys		mapObject
mapValues		matches		matchesWith
merge		nest		objectToEntries
objectToPairs		objectToQueryString		omit
omitBy		pick		pickBy
renameKeys		shallowClone		symbolizeKeys
toPairs		transform		unflattenObject

Functions

Snippet		Snippet		Snippet
ary		attempt		binary
bind		bindAll		bindKey
call		chainAsync		collectInto
compose		composeRight		complement
converge		curry		debounce
debouncePromise		defer		either
flip		functionName		functions
generateItems		generatorToArray		isAsyncFunction
isFunction		isGeneratorFunction		isPromiseLike
juxt		memoize		mostPerformant
negate		nor		not
nthArg		once		or
over		overArgs		partial
partialRight		pipeAsyncFunctions		pipeFunctions
promisify		rearg		runAsync
runPromisesInSeries		sleep		spreadOver
throttle		timeTaken		times
unary		uncurry		unfold
when		xor

Strings

Snippet		Snippet		Snippet
byteSize		caesarCipher		capitalize
capitalizeEveryWord		changeLightness		compactWhitespace
containsWhitespace		countSubstrings		decapitalize
escapeHTML		escapeRegExp		expandTabs
extendHex		fromCamelCase		indentString
isAlpha		isAlphaNumeric		isAnagram
isIsomorphic		isLowerCase		isUpperCase
isValidJSON		luhnCheck		mask
normalizeLineEndings		pad		padNumber
palindrome		parseCookie		pluralize
prefix		prettyBytes		removeAccents
removeNonASCII		removeWhitespace		replaceLast
reverseString		serializeCookie		slugify
sortCharactersInString		splitLines		stringifyCircularJSON
stringPermutations		stripHTMLTags		swapCase
toCamelCase		toKebabCase		toSnakeCase
toTitleCase		truncateString		truncateStringAtWhitespace
unescapeHTML		URLJoin		words
wordWrap

Math & Numbers

Snippet		Snippet		Snippet
approximatelyEqual		arithmeticProgression		average
averageBy		binomialCoefficient		cartesianProduct
celsiusToFahrenheit		clampNumber		copySign
distance		divmod		euclideanDistance
factorial		fahrenheitToCelsius		fibonacci
frozenSet		gcd		geometricProgression
hammingDistance		heapsort		hz
inRange		isPowerOfTen		isPowerOfTwo
isPrime		kMeans		kmToMiles
kNearestNeighbors		lcm		levenshteinDistance
linearSearch		logBase		mapNumRange
maxDate		mergeSortedArrays		midpoint
milesToKm		minDate		nthRoot
powerset		primeFactors		primes
prod		radsToDegrees		randomAlphaNumeric
randomBoolean		randomHexColorCode		randomIntArrayInRange
randomIntegerInRange		randomNumberInRange		round
sdbm		standardDeviation		sumPower
toDecimalMark		toOrdinalSuffix		toRomanNumeral
toSafeInteger		validateNumber		vectorAngle
vectorDistance		weightedAverage		weightedSample

Date & Time

Snippet		Snippet		Snippet
addDaysToDate		addMinutesToDate		addWeekDays
countWeekDaysBetween		dateRangeGenerator		dayName
dayOfYear		daysAgo		daysFromNow
daysInMonth		formatDuration		formatSeconds
fromTimestamp		getColonTimeFromDate		getDaysDiffBetweenDates
getHoursDiffBetweenDates		getMeridiemSuffixOfInteger		getMinutesDiffBetweenDates
getMonthsDiffBetweenDates		getSecondsDiffBetweenDates		getTimestamp
isAfterDate		isBeforeDate		isBetweenDates
isDateValid		isISOString		isLeapYear
isSameDate		isWeekday		isWeekend
lastDateOfMonth		quarterOfYear		toISOStringWithTimezone
tomorrow		weekOfYear		yesterday

Browser & DOM

Snippet		Snippet		Snippet
addClass		addEventListenerAll		addMultipleEvents
addStyles		atob		both
bottomVisible		btoa		colorize
copyToClipboard		counter		createDirIfNotExists
createElement		createEventHub		currentURL
cycleGenerator		detectDeviceType		detectLanguage
elementContains		elementIsFocused		elementIsVisibleInViewport
fullscreen		getAncestors		getBaseURL
getElementsBiggerThanViewport		getImages		getParentsUntil
getProtocol		getScrollPosition		getSelectedText
getSiblings		getStyle		getURLParameters
getVerticalOffset		hasClass		hasFlags
hide		httpDelete		httpGet
httpPost		httpPut		httpsRedirect
injectCSS		insertAfter		insertBefore
isBrowser		isBrowserTabFocused		isLocalStorageEnabled
isNode		isSameOrigin		isSessionStorageEnabled
isTravisCI		JSONtoCSV		JSONToFile
listenOnce		nodeListToArray		observeMutations
off		on		onClickOutside
onScrollStop		onUserInputChange		queryStringToObject
readFileLines		recordAnimationFrames		redirect
removeElement		removeEventListenerAll		removeClass
renderElement		requireUncached		scrollToTop
serializeForm		setStyle		show
smoothScroll		supportsTouchEvents		toHash
toggleClass		triggerEvent		UUIDGeneratorBrowser
UUIDGeneratorNode		walkThrough

Types & Checks

Snippet		Snippet		Snippet
assertValidKeys		cloneRegExp		coalesce
coalesceFactory		combine		CSVToArray
CSVToJSON		formToObject		getType
hashBrowser		hashNode		HSBToRGB
HSLToRGB		is		isAbsoluteURL
isArrayLike		isBoolean		isDuplexStream
isEmpty		isNegativeZero		isNil
isNull		isNumber		isObject
isPrimitive		isReadableStream		isStream
isString		isSymbol		isUndefined
isWritableStream		RGBToHex		RGBToHSB
RGBToHSL		size		toCurrency
toCharArray		toHSLArray		toHSLObject
toRGBArray		toRGBObject		truthCheckCollection
untildify		yesNo

Sorting algorithms

Snippet	Description
bubbleSort	O(n²) comparison sort
bucketSort	Distribution sort
heapsort	O(n log n) in-place sort
insertionSort	O(n²), efficient for small inputs
mergeSort	O(n log n) divide-and-conquer sort
quickSort	O(n log n) average, in-place
selectionSort	O(n²) selection sort
binarySearch	O(log n) search on sorted arrays