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Int8Array

BaselineWidely available

ОбъектInt8Array представляет типизированный массив 8-разрядных целых значений. Содержимое инициализируется значением 0. Создав экземплярInt8Array, возможно получить доступ к элементам массива, используя методы объекта или стандартный синтаксис доступа к элементу массива по его индексу (с помощью скобочной нотации).

Syntax

new Int8Array(); // new in ES2017new Int8Array(length);new Int8Array(typedArray);new Int8Array(object);new Int8Array(buffer [, byteOffset [, length]]);

Для более детальной информации о синтаксисе конструктора смотритеTypedArray.

Properties

Int8Array.BYTES_PER_ELEMENT

Возвращает числовое значение размера элемента массива.1 в случае сInt8Array.

Int8Array.length

Статическая длина конструктораInt8Array, всегда равна3 (т.к. конструктор принимает до 3 аргументов). Чтобы узнать длину созданного массива, seeInt8Array.prototype.length.

Int8Array.name

Возвращает строчное значение имени конструктора. В случае сInt8Array: "Int8Array".

Int8Array.prototype

Прототип дляTypedArray objects.

Methods

Int8Array.from()

Creates a newInt8Array from an array-like or iterable object. See alsoArray.from().

Int8Array.of()

Creates a newInt8Array with a variable number of arguments. See alsoArray.of().

Int8Array prototype

AllInt8Array objects inherit from%TypedArray%.prototype.

Properties

Int8Array.prototype.constructor

Returns the function that created an instance's prototype. This is theInt8Array constructor by default.

Int8Array.prototype.bufferТолько для чтения

Returns theArrayBuffer referenced by theInt8Array Fixed at construction time and thusread only.

Int8Array.prototype.byteLengthТолько для чтения

Returns the length (in bytes) of theInt8Array from the start of itsArrayBuffer. Fixed at construction time and thusread only.

Int8Array.prototype.byteOffsetТолько для чтения

Returns the offset (in bytes) of theInt8Array from the start of itsArrayBuffer. Fixed at construction time and thusread only.

Int8Array.prototype.lengthТолько для чтения

Returns the number of elements hold in theInt8Array. Fixed at construction time and thusread only.

Methods

Int8Array.prototype.copyWithin()

Copies a sequence of array elements within the array. See alsoArray.prototype.copyWithin().

Int8Array.prototype.entries()

Returns a newArray Iterator object that contains the key/value pairs for each index in the array. See alsoArray.prototype.entries().

Int8Array.prototype.every()

Tests whether all elements in the array pass the test provided by a function. See alsoArray.prototype.every().

Int8Array.prototype.fill()

Fills all the elements of an array from a start index to an end index with a static value. See alsoArray.prototype.fill().

Int8Array.prototype.filter()

Creates a new array with all of the elements of this array for which the provided filtering function returns true. See alsoArray.prototype.filter().

Int8Array.prototype.find()

Returns the found value in the array, if an element in the array satisfies the provided testing function orundefined if not found. See alsoArray.prototype.find().

Int8Array.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 alsoArray.prototype.findIndex().

Int8Array.prototype.forEach()

Calls a function for each element in the array. See alsoArray.prototype.forEach().

Int8Array.prototype.includes()Экспериментальная возможность

Determines whether a typed array includes a certain element, returningtrue orfalse as appropriate. See alsoArray.prototype.includes().

Int8Array.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 alsoArray.prototype.indexOf().

Int8Array.prototype.join()

Joins all elements of an array into a string. See alsoArray.prototype.join().

Int8Array.prototype.keys()

Returns a newArray Iterator that contains the keys for each index in the array. See alsoArray.prototype.keys().

Int8Array.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 alsoArray.prototype.lastIndexOf().

Int8Array.prototype.map()

Creates a new array with the results of calling a provided function on every element in this array. See alsoArray.prototype.map().

Int8Array.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 alsoArray.prototype.reduce().

Int8Array.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 alsoArray.prototype.reduceRight().

Int8Array.prototype.reverse()

Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See alsoArray.prototype.reverse().

Int8Array.prototype.set()

Stores multiple values in the typed array, reading input values from a specified array.

Int8Array.prototype.slice()

Extracts a section of an array and returns a new array. See alsoArray.prototype.slice().

Int8Array.prototype.some()

Returns true if at least one element in this array satisfies the provided testing function. See alsoArray.prototype.some().

Int8Array.prototype.sort()

Sorts the elements of an array in place and returns the array. See alsoArray.prototype.sort().

Int8Array.prototype.subarray()

Returns a newInt8Array from the given start and end element index.

Int8Array.prototype.values()

Returns a newArray Iterator object that contains the values for each index in the array. See alsoArray.prototype.values().

Int8Array.prototype.toLocaleString()

Returns a localized string representing the array and its elements. See alsoArray.prototype.toLocaleString().

Int8Array.prototype.toString()

Returns a string representing the array and its elements. See alsoArray.prototype.toString().

Int8Array.prototype[@@iterator]()

Returns a newArray Iterator object that contains the values for each index in the array.

Examples

Different ways to create anInt8Array:

js
// From a lengthvar int8 = new Int8Array(2);int8[0] = 42;console.log(int8[0]); // 42console.log(int8.length); // 2console.log(int8.BYTES_PER_ELEMENT); // 1// From an arrayvar arr = new Int8Array([21, 31]);console.log(arr[1]); // 31// From another TypedArrayvar x = new Int8Array([21, 31]);var y = new Int8Array(x);console.log(y[0]); // 21// From an ArrayBuffervar buffer = new ArrayBuffer(8);var z = new Int8Array(buffer, 1, 4);// From an iterablevar iterable = (function* () {  yield* [1, 2, 3];})();var int8 = new Int8Array(iterable);// Int8Array[1, 2, 3]

Спецификации

Specification
ECMAScript® 2026 Language Specification
# sec-typedarray-objects

Совместимость с браузерами

Compatibility notes

Starting with ECMAScript 2015,Int8Array constructors require to be constructed with anew operator. Calling aInt8Array constructor as a function withoutnew, will throw aTypeError from now on.

js
var dv = Int8Array([1, 2, 3]);// TypeError: calling a builtin Int8Array constructor// without new is forbidden
js
var dv = new Int8Array([1, 2, 3]);

Смотрите также

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