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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.
byteLength () .
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer, 2);
console.log(uint8.byteLength);
// Expected output: 6
byteLength undefined . TypedArray . TypedArray byteOffset length ArrayBuffer length . TypedArray TypedArray .
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer);
uint8.byteLength; // 8 (buffer byteLength )
const uint8newLength = new Uint8Array(buffer, 1, 5);
uint8newLength.byteLength; // 5 (Uint8Array )
const uint8offSet = new Uint8Array(buffer, 2);
uint8offSet.byteLength; // 6 ( Uint8Array )
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-get-%typedarray%.prototype.bytelength |
This page was last modified on 2025 2 11 by MDN contributors.
TypedArrayTypedArray.prototype.at()TypedArray.prototype.copyWithin()TypedArray.prototype.entries()TypedArray.prototype.every()TypedArray.prototype.fill()TypedArray.prototype.filter()TypedArray.prototype.find()TypedArray.prototype.findIndex()TypedArray.prototype.findLast()TypedArray.prototype.findLastIndex()TypedArray.prototype.forEach()includes()TypedArray.prototype.indexOf()TypedArray.prototype.join()TypedArray.prototype.keys()lastIndexOf()TypedArray.prototype.map()TypedArray.prototype.reduce()reduceRight()TypedArray.prototype.reverse()TypedArray.prototype.set()TypedArray.prototype.slice()TypedArray.prototype.some()TypedArray.prototype.sort()TypedArray.prototype.subarray()toLocaleString()TypedArray.prototype.toReversed()TypedArray.prototype.toSorted()TypedArray.prototype.toString()TypedArray.prototype.values()TypedArray.prototype.with()TypedArray.prototype[@@iterator]()Object/FunctionObject.prototype.__defineGetter__()Object.prototype.__defineSetter__()Object.prototype.__lookupGetter__()Object.prototype.__lookupSetter__()Object.prototype.hasOwnProperty()Object.prototype.isPrototypeOf()Object.prototype.propertyIsEnumerable()Object.prototype.toLocaleString()Object.prototype.toString()Object.prototype.valueOf()BigInt64ArrayBigUint64ArrayFloat16ArrayFloat32ArrayFloat64ArrayInt8ArrayInt16ArrayInt32ArrayUint8ArrayUint8ClampedArrayUint16ArrayUint32ArrayYour blueprint for a better internet.
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