Int32Array() constructor

The Int32Array() typed array constructor creates an array of twos-complement 32-bit signed 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 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.




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);
// Int32Array [1, 2, 3]


ECMAScript Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also