Web/JavaScript/Reference/Global objects/Int32Array

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).

Syntax

new Int32Array(); // new in ES2017
new Int32Array(length);
new Int32Array(typedArray);
new Int32Array(object);
new Int32Array(buffer [, byteOffset [, length]]);

Parameters

length: When called with a length argument, an internal array buffer is created in memory, of size length multiplied by BYTES_PER_ELEMENT bytes, containing zeros.
typedArray: When called with a typedArray argument, which can be an object of any of the typed array types (such as Int32Array), the typedArray gets copied into a new typed array. Each value in typedArray is converted to the corresponding type of the constructor before being copied into the new array. The length of the new typed array will be same as the length of the typedArray argument.
object: When called with an object argument, a new typed array is created as if by the TypedArray.from() method.
buffer, byteOffset, length: When called with a buffer, and optionally a byteOffset and a length argument, a new typed array view is created that views the specified ArrayBuffer. The byteOffset and length parameters specify the memory range that will be exposed by the typed array view. If both are omitted, all of buffer is viewed; if only length is omitted, the remainder of buffer is viewed.

Examples

Different ways to create an Int32Array

// From a length
var 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
var arr = new Int32Array([21,31]);
console.log(arr[1]); // 31

// From another TypedArray
var x = new Int32Array([21, 31]);
var y = new Int32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
var buffer = new ArrayBuffer(16);
var z = new Int32Array(buffer, 0, 4);

// From an iterable
var iterable = function*(){ yield* [1,2,3]; }();
var int32 = new Int32Array(iterable);
// Int32Array[1, 2, 3]

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'TypedArray constructors' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`Int32Array()` constructor	Chrome Full support 7	Edge Full support 12	Firefox Full support 4	IE Full support 10	Opera Full support 11.6	Safari Full support 5.1	WebView Android Full support 4	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 12	Safari iOS Full support 4.2	Samsung Internet Android Full support 1.0	nodejs Full support 0.10
Constructor without arguments	Chrome Full support 7	Edge Full support 12	Firefox Full support 55	IE Full support 10	Opera Full support 11.6	Safari Full support 5.1	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 55	Opera Android Full support 12	Safari iOS Full support 5	Samsung Internet Android Full support 1.0	nodejs Full support 0.10
`new Int32Array(iterable)`	Chrome Full support 39	Edge Full support 14	Firefox Full support 52	IE No support No	Opera Full support 26	Safari Full support 10	WebView Android Full support 39	Chrome Android Full support 39	Firefox Android Full support 52	Opera Android Full support 26	Safari iOS Full support 10	Samsung Internet Android Full support 4.0	nodejs Full support 4.0.0
`Int32Array()` without `new` throws	Chrome Full support 7	Edge Full support 14	Firefox Full support 44	IE No support No	Opera Full support 15	Safari Full support 5.1	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 44	Opera Android Full support 14	Safari iOS Full support 5	Samsung Internet Android Full support 1.0	nodejs Full support 0.12

Legend

Full support: Full support
No support: No support

Compatibility notes

Starting with ECMAScript 2015, Int32Array constructors require to be constructed with a new operator. Calling a Int32Array constructor as a function without new, will throw a TypeError from now on.

var dv = Int32Array([1, 2, 3]);
// TypeError: calling a builtin Int32Array constructor
// without new is forbidden

var dv = new Int32Array([1, 2, 3]);