Uint32Array() constructor

The Uint32Array() typed array constructor creates an array of 32-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).


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.




Different ways to create a Uint32Array

// 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);
// Uint32Array [1, 2, 3]


ECMAScript Language Specification
# sec-typedarray-constructors

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See also