Uint8ClampedArray() constructor

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The Uint8ClampedArray() constructor creates Uint8ClampedArray objects. The contents are initialized to 0 unless initialization data is explicitly provided.

Syntax

new Uint8ClampedArray()
new Uint8ClampedArray(length)
new Uint8ClampedArray(typedArray)
new Uint8ClampedArray(object)

new Uint8ClampedArray(buffer)
new Uint8ClampedArray(buffer, byteOffset)
new Uint8ClampedArray(buffer, byteOffset, length)

Note: Uint8ClampedArray() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

See TypedArray.

Exceptions

See TypedArray.

Examples

Different ways to create a Uint8ClampedArray

// From a length
const uint8c = new Uint8ClampedArray(2);
uint8c[0] = 42;
uint8c[1] = 1337;
console.log(uint8c[0]); // 42
console.log(uint8c[1]); // 255 (clamped)
console.log(uint8c.length); // 2
console.log(uint8c.BYTES_PER_ELEMENT); // 1

// From an array
const x = new Uint8ClampedArray([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Uint8ClampedArray(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(8);
const z = new Uint8ClampedArray(buffer, 1, 4);
console.log(z.byteOffset); // 1

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const uint8cFromIterable = new Uint8ClampedArray(iterable);
console.log(uint8cFromIterable);
// Uint8ClampedArray [1, 2, 3]

Specifications

Specification
ECMAScript Language Specification # sec-typedarray-constructors

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`Uint8ClampedArray`	7	12	4	11.6	5.1	18	4	12	4.2	1.0	4	1.0	0.10.0
`constructor_without_parameters`	7	12	55	11.6	5.1	18	55	12	5	1.0	≤37	1.0	0.10.0
`iterable_allowed`	39	14	52	26	10	39	52	26	10	4.0	39	1.0	4.0.0