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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, start 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.

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;
}

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]

Specifications

Browser compatibilityUpdate compatibility data on GitHub

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

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/fill