W3cubDocs

Float16Array() constructor

Baseline 2025

Newly available

Since ⁨April 2025⁩, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The Float16Array() constructor creates Float16Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

Syntax

new Float16Array()
new Float16Array(length)
new Float16Array(typedArray)
new Float16Array(object)

new Float16Array(buffer)
new Float16Array(buffer, byteOffset)
new Float16Array(buffer, byteOffset, length)

Note: Float16Array() 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 Float16Array

// From a length
const float16 = new Float16Array(2);
float16[0] = 42;
console.log(float16[0]); // 42
console.log(float16.length); // 2
console.log(float16.BYTES_PER_ELEMENT); // 2

// From an array
const x = new Float16Array([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Float16Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(32);
const z = new Float16Array(buffer, 4, 4);
console.log(z.byteOffset); // 4

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const float16FromIterable = new Float16Array(iterable);
console.log(float16FromIterable);
// Float16Array [1, 2, 3]

Specifications

Specification
ECMAScript® 2026 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
`Float16Array`	135	135	129	120	18.2	135	129	89	18.2	29.0	135	18.2	1.1.23	1.43	24.0.0