Uint32Array() 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 Uint32Array() constructor creates Uint32Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

Syntax

js
new Uint32Array()
new Uint32Array(length)
new Uint32Array(typedArray)
new Uint32Array(object)

new Uint32Array(buffer)
new Uint32Array(buffer, byteOffset)
new Uint32Array(buffer, byteOffset, length)

Note: Uint32Array() 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 Uint32Array

js
// From a length
const uint32 = new Uint32Array(2);
uint32[0] = 42;
console.log(uint32[0]); // 42
console.log(uint32.length); // 2
console.log(uint32.BYTES_PER_ELEMENT); // 4

// From an array
const x = new Uint32Array([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Uint32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(32);
const z = new Uint32Array(buffer, 4, 4);
console.log(z.byteOffset); // 4

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const uint32FromIterable = new Uint32Array(iterable);
console.log(uint32FromIterable);
// Uint32Array [1, 2, 3]

Specifications

Specification
ECMAScript Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also