Float32Array

Summary

The Float32Array typed array represents an array of 32-bit floating point numbers (corresponding to the C float data type) 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

Float32Array(length);
Float32Array(typedArray);
Float32Array(object);
Float32Array(buffer [, byteOffset [, length]]);

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

Properties

Float32Array.BYTES_PER_ELEMENT

Returns a number value of the element size. 4 in the case of an Float32Array.

Float32Array.length

Length property whose value is 3.

Float32Array.name

Returns the string value of the constructor name. In the case of the Float32Array type: "Float32Array".

Float32Array.prototype

Prototype for the TypedArray objects.

Methods

Float32Array.from()

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

Float32Array.of()

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

Float32Array prototype

All Float32Array objects inherit from %TypedArray%.prototype.

Properties

Float32Array.prototype.constructor

Returns the function that created an instance's prototype. This is the Float32Array constructor by default.

Float32Array.prototype.buffer Read only

Returns the ArrayBuffer referenced by the Float32Array Fixed at construction time and thus read only.

Float32Array.prototype.byteLength Read only

Returns the length (in bytes) of the Float32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.

Float32Array.prototype.byteOffset Read only

Returns the offset (in bytes) of the Float32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.

Float32Array.prototype.length Read only

Returns the number of elements hold in the Float32Array. Fixed at construction time and thus read only.

Methods

Float32Array.prototype.copyWithin()

See Array.prototype.copyWithin().

Float32Array.prototype.move() Unimplemented

Former non-standard version of Float32Array.prototype.copyWithin().

Float32Array.prototype.set()

Stores multiple values in the Float32Array, reading input values from a specified array.

Float32Array.prototype.subarray()

Returns a new Float32Array from the given start and end element index.

Examples

// From a length
var float32 = new Float32Array(2);
float32[0] = 42;
console.log(float32[0]); // 42
console.log(float32.length); // 2
console.log(float32.BYTES_PER_ELEMENT); // 4

// From an array
var arr = new Float32Array([21,31]);
console.log(arr[1]); // 31

// From another TypedArray
var x = new Float32Array([21, 31]);
var y = new Float32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
var buffer = new ArrayBuffer(16);
var z = Float32Array(buffer, 0, 4);

Specifications

Browser compatibility

See also

• JavaScript typed arrays
• ArrayBuffer
• DataView