Float16Array

Baseline2025

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

TheFloat16Array typed array represents an array of 16-bit floating point numbers in the platform byte order. If control over byte order is needed, useDataView instead. The contents are initialized to0 unless initialization data is explicitly provided. 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).

Float16Array is a subclass of the hiddenTypedArray class.

Note:Float16 support is not universal, both in the JavaScript API and the underlying CPU architecture. Using it may result in slower performance on some platforms. It is intended for interacting with highly optimized and performance-sensitive systems such asfloat-backed canvases, WebGPU, WebGL, and deep learning models includingstable diffusion.

Constructor

Float16Array(): Creates a newFloat16Array object.

Static properties

Also inherits static properties from its parentTypedArray.

Float16Array.BYTES_PER_ELEMENT: Returns a number value of the element size.2 in the case ofFloat16Array.

Static methods

Inherits static methods from its parentTypedArray.

Instance properties

Also inherits instance properties from its parentTypedArray.

These properties are defined onFloat16Array.prototype and shared by allFloat16Array instances.

Float16Array.prototype.BYTES_PER_ELEMENT: Returns a number value of the element size.2 in the case of aFloat16Array.
Float16Array.prototype.constructor: The constructor function that created the instance object. ForFloat16Array instances, the initial value is theFloat16Array constructor.

// From a lengthconst float16 = new Float16Array(2);float16[0] = 42;console.log(float16[0]); // 42console.log(float16.length); // 2console.log(float16.BYTES_PER_ELEMENT); // 2// From an arrayconst x = new Float16Array([21, 31]);console.log(x[1]); // 31// From another TypedArrayconst y = new Float16Array(x);console.log(y[0]); // 21// From an ArrayBufferconst buffer = new ArrayBuffer(32);const z = new Float16Array(buffer, 4, 4);console.log(z.byteOffset); // 4// From an iterableconst iterable = (function* () {  yield* [1, 2, 3];})();const float16FromIterable = new Float16Array(iterable);console.log(float16FromIterable);// Float16Array [1, 2, 3]