Float32Array() constructor

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since July 2015.

The Float32Array() constructor creates Float32Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

Syntax

new Float32Array()
new Float32Array(length)
new Float32Array(typedArray)
new Float32Array(object)

new Float32Array(buffer)
new Float32Array(buffer, byteOffset)
new Float32Array(buffer, byteOffset, length)

Note: Float32Array() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

See TypedArray.

Exceptions

See TypedArray.

Examples

Different ways to create a Float32Array

// From a length
const 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
const x = new Float32Array([21, 31]);
console.log(x[1]); // 31

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

// From an ArrayBuffer
const buffer = new ArrayBuffer(32);
const z = new Float32Array(buffer, 4, 4);
console.log(z.byteOffset); // 4

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const float32FromIterable = new Float32Array(iterable);
console.log(float32FromIterable);
// Float32Array [1, 2, 3]

Specifications

Specification
ECMAScript® 2027 Language Specification # sec-typedarray-constructors

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`Float32Array`	7	12	4	11.6	5.1	18	4	12	4.2	1.0	4	4.2	1.0.0	1.0	0.10.0
`constructor_without_parameters`	7	12	55	11.6	5.1	18	55	12	5	1.0	4.4	5	1.0.0	1.0	0.10.0
`iterable_allowed`	39	14	52	26	10	39	52	26	10	4.0	39	10	1.0.0	1.0	4.0.0