Float64Array() constructor

The Float64Array() constructor creates Float64Array objects. The contents are initialized to 0.

Syntax

js
new Float64Array()
new Float64Array(length)
new Float64Array(typedArray)
new Float64Array(object)

new Float64Array(buffer)
new Float64Array(buffer, byteOffset)
new Float64Array(buffer, byteOffset, length)

Note: Float64Array() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

Exceptions

Examples

Different ways to create a Float64Array

js
// From a length
const float64 = new Float64Array(2);
float64[0] = 42;
console.log(float64[0]); // 42
console.log(float64.length); // 2
console.log(float64.BYTES_PER_ELEMENT); // 8

// From an array
const x = new Float64Array([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Float64Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(64);
const z = new Float64Array(buffer, 8, 4);
console.log(z.byteOffset); // 8

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const float64FromIterable = new Float64Array(iterable);
console.log(float64FromIterable);
// Float64Array [1, 2, 3]

Specifications

Specification
ECMAScript Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also