Uint32Array

Summary

The Uint32Array typed array represents an array of 32-bit unsigned 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

Uint32Array(length);
Uint32Array(typedArray);
Uint32Array(object);
Uint32Array(buffer [, byteOffset [, length]]);

For more information about the constructor syntax and the parameters, see TypedArray.

Properties

Uint32Array.BYTES_PER_ELEMENT

Returns a number value of the element size. 4 in the case of an Uint32Array.

Uint32Array.length

Length property whose value is 3.

Uint32Array.name

Returns the string value of the constructor name. In the case of the Uint32Array type: "Uint32Array".

Uint32Array.prototype

Prototype for the TypedArray objects.

Methods

Uint32Array.from()

See Array.from(). Not implemented, see bug 896608.

Uint32Array.of()

See Array.of(). Not implemented, see bug 896608.

Uint32Array prototype

All Uint32Array objects inherit from %TypedArray%.prototype.

Properties

Uint32Array.prototype.constructor

Returns the function that created an instance's prototype. This is the Uint32Array constructor by default.

Uint32Array.prototype.buffer Read only

Returns the ArrayBuffer referenced by the Uint32Array Fixed at construction time and thus read only.

Uint32Array.prototype.byteLength Read only

Returns the length (in bytes) of the Uint32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.

Uint32Array.prototype.byteOffset Read only

Returns the offset (in bytes) of the Uint32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.

Uint32Array.prototype.length Read only

Returns the number of elements hold in the Uint32Array. Fixed at construction time and thus read only.

Methods

Uint32Array.prototype.copyWithin()

See Array.prototype.copyWithin().

Uint32Array.prototype.move() Unimplemented

Former non-standard version of Uint32Array.prototype.copyWithin().

Uint32Array.prototype.set()

Stores multiple values in the Uint32Array, reading input values from a specified array.

Uint32Array.prototype.subarray()

Returns a new Uint32Array from the given start and end element index.

Examples

// From a length
var uint32 = new Uint32Array(2);
uint32[0] = 42;
console.log(uint32[0]); // 42
console.log(uint32.length); // 2
console.log(uint32.BYTES_PER_ELEMENT); // 4

// From an array
var arr = new Uint32Array([21,31]);
console.log(arr[1]); // 31

// From another TypedArray
var x = new Uint32Array([21, 31]);
var y = new Uint32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
var buffer = new ArrayBuffer(16);
var z = Uint32Array(buffer, 0, 4);

Specifications

Browser compatibility

See also

• JavaScript typed arrays
• ArrayBuffer
• DataView