TypedArray.prototype.fill()

The fill() method of {{jsxref("TypedArray")}} 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 as {{jsxref("Array.prototype.fill()")}}.

{{InteractiveExample("JavaScript Demo: TypedArray.prototype.fill()", "shorter")}}

```js interactive-example 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]

## Syntax

```js-nolint
fill(value)
fill(value, start)
fill(value, start, end)

Parameters#

• value
• : Value to fill the typed array with.
• start {{optional_inline}}
• : Zero-based index at which to start filling, converted to an integer.
• end {{optional_inline}}
• : Zero-based index at which to end filling, converted to an integer. fill() fills up to but not including end.

Return value#

The modified typed array, filled with value.

Description#

See {{jsxref("Array.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]

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• Polyfill of TypedArray.prototype.fill in core-js
• JavaScript typed arrays guide
• {{jsxref("TypedArray")}}
• {{jsxref("Array.prototype.fill()")}}