TypedArray.prototype.fill()

BaselineWidely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.

Thefill() method ofTypedArray instances changes all elements within a range of indices in a typed array to a static value. It returns the modified typed array. This method has the same algorithm asArray.prototype.fill().

Try it

const uint8 = new Uint8Array([0, 0, 0, 0]);// Value, start position, end positionuint8.fill(4, 1, 3);console.log(uint8);// Expected output: Uint8Array [0, 4, 4, 0]

Syntax

fill(value)fill(value, start)fill(value, start, end)

Parameters

value: Value to fill the typed array with.
startOptional: Zero-based index at which to start filling,converted to an integer.
endOptional: Zero-based index at which to end filling,converted to an integer.fill() fills up to but not includingend.

Return value

The modified typed array, filled withvalue.

Description

SeeArray.prototype.fill() for more details. This method is not generic and can only be called on typed array instances.

Examples

Using fill()

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]