Float64Array

20157

Float64Array 64 ( C ) DataView 0 ()

new Float64Array(length);
new Float64Array(typedArray);
new Float64Array(object);
new Float64Array(buffer [, byteOffset [, length]]);

TypedArray.

Float64Array.BYTES_PER_ELEMENT: Float64Array 8
Float64Array.length: 3 () Float64Array.prototype.length
Float64Array.prototype: TypedArray

Float64Array.from(): Float64Array Array.from()
Float64Array.of(): Float64Array Array.of()

TypedArray

Float64Array.prototype.constructor: Float64Array
Float64Array.prototype.buffer: Float64Array ArrayBuffer
Float64Array.prototype.byteLength: Float64Array ArrayBuffer ()
Float64Array.prototype.byteOffset: Float64Array ArrayBuffer ()
Float64Array.prototype.length: Float64Array

TypedArray

// From a length
var 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
var arr = new Float64Array([21, 31]);
console.log(arr[1]); // 31

// From another TypedArray
var x = new Float64Array([21, 31]);
var y = new Float64Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
var buffer = new ArrayBuffer(32);
var z = new Float64Array(buffer, 0, 4);


ECMAScript 2027 LanguageSpecification # sec-typedarray-objects

ECMAScript 2015 (ES6) Float32Array new Float32Array new TypeError

var dv = Float64Array([1, 2, 3]);
// TypeError: calling a builtin Float64Array constructor
//  new

var dv = new Float64Array([1, 2, 3]);

MDN

2026526 MDN

GitHub