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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2016 9.
fill() . fill() Array.prototype.fill() . TypedArray typed array types .
const uint8 = new Uint8Array([0, 0, 0, 0]);
// Value, start position, end position
uint8.fill(4, 1, 3);
console.log(uint8);
// Expected output: Uint8Array [0, 4, 4, 0]
typedarray.fill(value[, start = 0[, end = this.length]])
start end .
fill value, start and 3 . start end 0 .
start , start , end , end .
new Uint8Array([1, 2, 3]).fill(4); // Uint8Array [4, 4, 4]
new Uint8Array([1, 2, 3]).fill(4, 1); // Uint8Array [1, 4, 4]
new Uint8Array([1, 2, 3]).fill(4, 1, 2); // Uint8Array [1, 4, 3]
new Uint8Array([1, 2, 3]).fill(4, 1, 1); // Uint8Array [1, 2, 3]
new Uint8Array([1, 2, 3]).fill(4, -3, -2); // Uint8Array [4, 2, 3]
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-%typedarray%.prototype.fill |
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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