Float64Array

BaselineWidely available

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

TheFloat64Array typed array represents an array of 64-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).

Float64Array is a subclass of the hiddenTypedArray class.

Constructor

Float64Array(): Creates a newFloat64Array object.

Static properties

Also inherits static properties from its parentTypedArray.

Float64Array.BYTES_PER_ELEMENT: Returns a number value of the element size.8 in the case ofFloat64Array.

Static methods

Inherits static methods from its parentTypedArray.

Instance properties

Also inherits instance properties from its parentTypedArray.

These properties are defined onFloat64Array.prototype and shared by allFloat64Array instances.

Float64Array.prototype.BYTES_PER_ELEMENT: Returns a number value of the element size.8 in the case of aFloat64Array.
Float64Array.prototype.constructor: The constructor function that created the instance object. ForFloat64Array instances, the initial value is theFloat64Array constructor.

// From a lengthconst float64 = new Float64Array(2);float64[0] = 42;console.log(float64[0]); // 42console.log(float64.length); // 2console.log(float64.BYTES_PER_ELEMENT); // 8// From an arrayconst x = new Float64Array([21, 31]);console.log(x[1]); // 31// From another TypedArrayconst y = new Float64Array(x);console.log(y[0]); // 21// From an ArrayBufferconst buffer = new ArrayBuffer(64);const z = new Float64Array(buffer, 8, 4);console.log(z.byteOffset); // 8// From an iterableconst iterable = (function* () {  yield* [1, 2, 3];})();const float64FromIterable = new Float64Array(iterable);console.log(float64FromIterable);// Float64Array [1, 2, 3]