Int32Array() 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 Int32Array() constructor creates Int32Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

Syntax

new Int32Array()
new Int32Array(length)
new Int32Array(typedArray)
new Int32Array(object)

new Int32Array(buffer)
new Int32Array(buffer, byteOffset)
new Int32Array(buffer, byteOffset, length)

Note: Int32Array() 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 an Int32Array

// From a length
const int32 = new Int32Array(2);
int32[0] = 42;
console.log(int32[0]); // 42
console.log(int32.length); // 2
console.log(int32.BYTES_PER_ELEMENT); // 4

// From an array
const x = new Int32Array([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Int32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(32);
const z = new Int32Array(buffer, 4, 4);
console.log(z.byteOffset); // 4

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const int32FromIterable = new Int32Array(iterable);
console.log(int32FromIterable);
// Int32Array [1, 2, 3]

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-typedarray-constructors