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Float32Array() constructor

The Float32Array() constructor creates Float32Array objects. The contents are initialized to 0.

Syntax

js
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

Exceptions

Examples

Different ways to create a Float32Array

js
// 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

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android Deno Node.js
Float32Array 7 12 4 11.6 5.1 18 4 12 4.2 1.0 4 1.0 0.10.0
constructor_without_parameters 7 12 55 11.6 5.1 18 55 12 5 1.0 ≤37 1.0 0.10.0
iterable_allowed 39 14 52 26 10 39 52 26 10 4.0 39 1.0 4.0.0
new_required 7 14 44 15 5.1 18 44 14 5 1.0 ≤37 1.0 0.12.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array/Float32Array