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Float64Array
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since июль 2015 г..
ОбъектFloat64Array представляет типизированный массив 64-битных чисел с плавающей запятой (соответствует типуdouble в языке C) с платформо-зависимым порядком байт.Если необходим контроль за порядком байт, то вместо этого объекта используйтеDataView. Содержимое инициализируется значением0. Создав экземплярFloat64Array , можно получить доступ к элементам массива, используя методы объекта или стандартный синтаксис доступа к элементу массива по его индексу (с помощью скобочной нотации - квадратные скобки).
Syntax
new Float64Array(); // new in ES2017new Float64Array(length);new Float64Array(typedArray);new Float64Array(object);new Float64Array(buffer [, byteOffset [, length]]);
For more information about the constructor syntax and the parameters, seeTypedArray.
Properties
Float64Array.BYTES_PER_ELEMENTReturns a number value of the element size.
8in the case of anFloat64Array.- Float64Array.length
Static length property whose value is 0. For the actual length (number of elements), see
Float64Array.prototype.length.Float64Array.nameReturns the string value of the constructor name. In the case of the
Float64Arraytype: "Float64Array".Float64Array.prototypePrototype for theTypedArray objects.
Methods
Float64Array.from()Creates a new
Float64Arrayfrom an array-like or iterable object. See alsoArray.from().Float64Array.of()Creates a new
Float64Arraywith a variable number of arguments. See alsoArray.of().
Float64Array prototype
AllFloat64Array objects inherit from%TypedArray%.prototype.
Properties
Float64Array.prototype.constructorReturns the function that created an instance's prototype. This is the
Float64Arrayconstructor by default.Float64Array.prototype.bufferТолько для чтенияReturns the
ArrayBufferreferenced by theFloat64ArrayFixed at construction time and thusread only.Float64Array.prototype.byteLengthТолько для чтенияReturns the length (in bytes) of the
Float64Arrayfrom the start of itsArrayBuffer. Fixed at construction time and thusread only.Float64Array.prototype.byteOffsetТолько для чтенияReturns the offset (in bytes) of the
Float64Arrayfrom the start of itsArrayBuffer. Fixed at construction time and thusread only.Float64Array.prototype.lengthТолько для чтенияReturns the number of elements hold in the
Float64Array. Fixed at construction time and thusread only.
Methods
Float64Array.prototype.copyWithin()Copies a sequence of array elements within the array. See also
Array.prototype.copyWithin().Float64Array.prototype.entries()Returns a new
Array Iteratorobject that contains the key/value pairs for each index in the array. See alsoArray.prototype.entries().Float64Array.prototype.every()Tests whether all elements in the array pass the test provided by a function. See also
Array.prototype.every().Float64Array.prototype.fill()Fills all the elements of an array from a start index to an end index with a static value. See also
Array.prototype.fill().Float64Array.prototype.filter()Creates a new array with all of the elements of this array for which the provided filtering function returns true. See also
Array.prototype.filter().Float64Array.prototype.find()Returns the found value in the array, if an element in the array satisfies the provided testing function or
undefinedif not found. See alsoArray.prototype.find().Float64Array.prototype.findIndex()Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. See also
Array.prototype.findIndex().Float64Array.prototype.forEach()Calls a function for each element in the array. See also
Array.prototype.forEach().Float64Array.prototype.includes()Экспериментальная возможностьDetermines whether a typed array includes a certain element, returning
trueorfalseas appropriate. See alsoArray.prototype.includes().Float64Array.prototype.indexOf()Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. See also
Array.prototype.indexOf().Float64Array.prototype.join()Joins all elements of an array into a string. See also
Array.prototype.join().Float64Array.prototype.keys()Returns a new
Array Iteratorthat contains the keys for each index in the array. See alsoArray.prototype.keys().Float64Array.prototype.lastIndexOf()Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. See also
Array.prototype.lastIndexOf().Float64Array.prototype.map()Creates a new array with the results of calling a provided function on every element in this array. See also
Array.prototype.map().Float64Array.prototype.reduce()Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. See also
Array.prototype.reduce().Float64Array.prototype.reduceRight()Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. See also
Array.prototype.reduceRight().Float64Array.prototype.reverse()Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See also
Array.prototype.reverse().Float64Array.prototype.set()Stores multiple values in the typed array, reading input values from a specified array.
Float64Array.prototype.slice()Extracts a section of an array and returns a new array. See also
Array.prototype.slice().Float64Array.prototype.some()Returns true if at least one element in this array satisfies the provided testing function. See also
Array.prototype.some().Float64Array.prototype.sort()Sorts the elements of an array in place and returns the array. See also
Array.prototype.sort().Float64Array.prototype.subarray()Returns a new
Float64Arrayfrom the given start and end element index.Float64Array.prototype.values()Returns a new
Array Iteratorobject that contains the values for each index in the array. See alsoArray.prototype.values().Float64Array.prototype.toLocaleString()Returns a localized string representing the array and its elements. See also
Array.prototype.toLocaleString().Float64Array.prototype.toString()Returns a string representing the array and its elements. See also
Array.prototype.toString().Float64Array.prototype[@@iterator]()Returns a new
Array Iteratorobject that contains the values for each index in the array.
Examples
Different ways to create aFloat64Array:
// From a lengthvar float64 = new Float64Array(2);float64[0] = 42;console.log(float64[0]); // 42console.log(float64.length); // 2console.log(float64.BYTES_PER_ELEMENT); // 8// From an arrayvar arr = new Float64Array([21, 31]);console.log(arr[1]); // 31// From another TypedArrayvar x = new Float64Array([21, 31]);var y = new Float64Array(x);console.log(y[0]); // 21// From an ArrayBuffervar buffer = new ArrayBuffer(32);var z = new Float64Array(buffer, 0, 4);// From an iterablevar iterable = (function* () { yield* [1, 2, 3];})();var float64 = new Float64Array(iterable);// Float64Array[1, 2, 3]Спецификации
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-typedarray-objects |
Совместимость с браузерами
Compatibility notes
Starting with ECMAScript 2015,Float64Array constructors require to be constructed with anew operator. Calling aFloat64Array constructor as a function withoutnew, will throw aTypeError from now on.
var dv = Float64Array([1, 2, 3]);// TypeError: calling a builtin Float64Array constructor// without new is forbiddenvar dv = new Float64Array([1, 2, 3]);