Uint32Array() constructor

The Uint32Array() constructor creates Uint32Array objects. The contents are initialized to 0.

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

Exceptions

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

BCD tables only load in the browser

See also