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
js
new Int32Array()
new Int32Array(length)
new Int32Array(typedArray)
new Int32Array(object)
new Int32Array(buffer)
new Int32Array(buffer, byteOffset)
new Int32Array(buffer, byteOffset, length)
Parameters
See TypedArray.
Exceptions
See TypedArray.
Examples
Different ways to create an Int32Array
js
// 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 |
Browser compatibility
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