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).
Int32Array() constructor
Syntax
new Int32Array(); // new in ES2017 new Int32Array(length); new Int32Array(typedArray); new Int32Array(object); new Int32Array(buffer); new Int32Array(buffer, byteOffset); new Int32Array(buffer, byteOffset, length);
Parameters
-
length
-
When called with a
length
argument, an internal array buffer is created in memory, of sizelength
multiplied byBYTES_PER_ELEMENT
bytes, containing zeros. -
typedArray
-
When called with a
typedArray
argument, which can be an object of any of the non-bigint typed-array types (such asInt32Array
), thetypedArray
gets copied into a new typed array. Each value intypedArray
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 thetypedArray
argument. -
object
-
When called with an
object
argument, a new typed array is created as if by theTypedArray.from()
method. -
buffer
,byteOffset
,length
-
When called with a
buffer
, and optionally abyteOffset
and alength
argument, a new typed array view is created that views the specifiedArrayBuffer
. ThebyteOffset
andlength
parameters specify the memory range that will be exposed by the typed array view. If both are omitted, all ofbuffer
is viewed; if onlylength
is omitted, the remainder ofbuffer
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
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
Int32Array |
7
|
12
|
4
|
10
|
11.6
|
5.1
|
4
|
18
|
4
|
12
|
4.2
|
1.0
|
1.0
|
0.10.0
|
constructor_without_parameters |
7
|
12
|
55
|
10
|
11.6
|
5.1
|
≤37
|
18
|
55
|
12
|
5
|
1.0
|
1.0
|
0.10.0
|
iterable_allowed |
39
|
14
|
52
|
No
|
26
|
10
|
39
|
39
|
52
|
26
|
10
|
4.0
|
1.0
|
4.0.0
|
new_required |
7
|
14
|
44
|
No
|
15
|
5.1
|
≤37
|
18
|
44
|
14
|
5
|
1.0
|
1.0
|
0.12.0
|
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]);
See also
© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int32Array/Int32Array