The Float64Array() constructor creates Float64Array objects. The contents are initialized to 0.
Syntax
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 withnew. Attempting to call it withoutnewthrows a TypeError.
Parameters
See TypedArray.
Exceptions
See TypedArray.
Examples
Different ways to create a Float64Array
// 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]