jsguides

Reference

Reference

Quick-lookup documentation for JavaScript built-ins, standard-library modules, and core methods.

Array Methods

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Methods available on every JavaScript Array instance.

Array.from()Array.fromAsync()Array.prototype.at()Array.prototype.concat()Array.prototype.copyWithin()Array.prototype.entries()Array.prototype.every()Array.prototype.fill()Array.prototype.filter()Array.prototype.find()Array.prototype.findIndex()Array.prototype.findLast()Array.prototype.findLastIndex()Array.prototype.flat()Array.prototype.flatMap()Array.prototype.forEach()Array.prototype.from()Array.prototype.includes()Array.prototype.indexOf()Array.prototype.isArray()Array.prototype.join()Array.prototype.keys()Array.prototype.lastIndexOf()Array.prototype.map()Array.prototype.of()Array.prototype.pop()Array.prototype.push()Array.prototype.reduce()Array.prototype.reduceRight()Array.prototype.reverse()Array.prototype.shift()Array.prototype.some()Array.prototype.sort()Array.prototype.splice()Array.prototype.toReversed()Array.prototype.toSorted()Array.prototype.toSpliced()Array.prototype.toString()Array.prototype.unshift()Array.prototype.values()Array.prototype.with()Object.groupBy()

Async APIs

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Promise-based APIs and async patterns.

fetch()PromisePromise.all()Promise.allSettled()Promise.any()Promise.prototype.catch()Promise.prototype.finally()Promise.prototype.then()Promise.race()Promise.reject()Promise.resolve()Promise.try()Promise.withResolvers()

Built-in Objects

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Core objects available in every JavaScript environment.

AbortControllerArrayArrayBufferBigIntconsoleDataViewDateErrorFinalizationRegistryIntlObjectRegExpSymbolTextDecoderTextEncoderTypedArrayURLSearchParamsWeakRef

Global Functions

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Top-level functions available in every JavaScript environment.

decodeURI()decodeURIComponent()encodeURI()encodeURIComponent()eval()isNaN()parseFloat()parseInt()structuredClone()

JSON

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JSON parsing and stringification.

JSON.isRawJSON()JSON.parse()JSON.stringify()

Map and Set

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Map, Set, WeakMap, and WeakSet collection types.

MapMap.prototype.clear()Map.prototype.delete()Map.prototype.entries()Map.prototype.forEach()Map.prototype.get()Map.prototype.has()Map.prototype.keys()Map.prototype.set()Map.prototype.values()SetSet.prototype.add()Set.prototype.clear()Set.prototype.delete()Set.prototype.entries()Set.prototype.forEach()Set.prototype.has()Set.prototype.keys()Set.prototype.sizeSet.prototype.values()WeakMapWeakSet

Math

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Math object for mathematical functions and constants.

Math.abs()Math.ceil()Math.clz32()Math.EMath.exp()Math.floor()Math.fround()Math.imul()Math.LN10Math.LN2Math.log()Math.log10()Math.LOG10EMath.log1p()Math.log2()Math.LOG2EMath.max()Math.min()Math.PIMath.pow()Math.round()Math.sign()Math.sqrt()Math.SQRT1_2Math.SQRT2Math.trunc()

Node.js Modules

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Core Node.js modules and APIs.

Bufferchild_process modulecrypto moduleevents modulefs modulefs/promises modulenode:httpnode:httpsnode:urlos modulepath moduleprocessreadline modulestream

Number

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Number type, constants, and parsing functions.

Number.isFinite()Number.isInteger()Number.isNaN()Number.prototype.toFixed()Number.prototype.toPrecision()Number.prototype.toString()

Object Methods

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Static methods on the Object constructor.

Object.assign()Object.create()Object.defineProperty()Object.entries()Object.freeze()Object.fromEntries()Object.getPrototypeOf()Object.hasOwn()Object.is()Object.keys()Object.seal()Object.setPrototypeOf()

String Methods

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Methods available on every JavaScript String instance.

String.fromCodePoint()String.prototype.at()String.prototype.charAt()String.prototype.charCodeAt()String.prototype.codePointAt()String.prototype.concat()String.prototype.endsWith()String.prototype.includes()String.prototype.indexOf()String.prototype.isWellFormed()String.prototype.lastIndexOf()String.prototype.localeCompare()String.prototype.match()String.prototype.matchAll()String.prototype.normalize()String.prototype.padEnd()String.prototype.padStart()String.prototype.repeat()String.prototype.replace()String.prototype.replaceAll()String.prototype.search()String.prototype.slice()String.prototype.split()String.prototype.startsWith()String.prototype.substring()String.prototype.toLowerCase()String.prototype.toUpperCase()String.prototype.toWellFormed()String.prototype.trim()String.prototype.trimEnd()String.prototype.trimStart()