Web/JavaScript/Reference/Global objects/TypedArray/fill

The fill() method fills all the elements of a typed array from a start index to an end index with a static value. This method has the same algorithm as Array.prototype.fill(). TypedArray is one of the typed array types here.

Syntax

typedarray.fill(value[, start = 0[, end = this.length]])

Parameters

value: Value to fill the typed array with.
start Optional: Start index. Defaults to 0.
end Optional: End index (not included). Defaults to this.length.

Return value

The modified array.

Description

The elements interval to fill is [start, end).

The fill() method takes up to three arguments value, startstart and end. The start and end arguments are optional with default values of 0 and the length of the this object.

If start is negative, it is treated as length+start where length is the length of the array. If end is negative, it is treated as length+end.

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]

Polyfill

Since there is no global object with the name TypedArray, polyfilling must be done on an "as needed" basis. Use the following "polyfill" along with the Array.prototype.fill() polyfill.

// https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.fill
if (!Uint8Array.prototype.fill) {
  Uint8Array.prototype.fill = Array.prototype.fill;
}

Specifications

Specification
[(ECMA-262)The definition of 'TypedArray.prototype.fill' in that specification.]

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`fill`	Chrome Full support 45	Edge Full support 14	Firefox Full support 37	IE No support No	Opera Full support 36	Safari Full support 9.1	WebView Android No support No	Chrome Android Full support 45	Firefox Android Full support 37	Opera Android No support No	Safari iOS Full support 9.3	Samsung Internet Android Full support 5.0	nodejs Full support 4.0.0

Legend

Full support: Full support
No support: No support