index.md

---

title: Int8Array
slug: Web/JavaScript/Reference/Global_Objects/Int8Array
page-type: javascript-class
browser-compat: javascript.builtins.Int8Array

---

{{JSRef}}

The Int8Array typed array represents an array of twos-complement 8-bit signed integers. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

Int8Array is a subclass of the hidden {{jsxref("TypedArray")}} class.

Constructor

• {{jsxref("Global_Objects/Int8Array/Int8Array", "Int8Array()")}}

  • : Creates a new Int8Array object.

Static properties

Also inherits static properties from its parent {{jsxref("TypedArray")}}.

• {{jsxref("TypedArray.BYTES_PER_ELEMENT", "Int8Array.BYTES_PER_ELEMENT")}}

  • : Returns a number value of the element size. 1 in the case of Int8Array.

• {{jsxref("TypedArray.name", "Int8Array.name")}}

  • : Returns the string value of the constructor name. "Int8Array" in the case of Int8Array.

Static methods

Inherits static methods from its parent {{jsxref("TypedArray")}}.

Instance properties

Also inherits instance properties from its parent {{jsxref("TypedArray")}}.

These properties are defined on Int8Array.prototype and shared by all Int8Array instances.

• {{jsxref("TypedArray.BYTES_PER_ELEMENT", "Int8Array.prototype.BYTES_PER_ELEMENT")}}

  • : Returns a number value of the element size. 1 in the case of a Int8Array.

• {{jsxref("Object/constructor", "Int8Array.prototype.constructor")}}

  • : The constructor function that created the instance object. For Int8Array instances, the initial value is the {{jsxref("Int8Array/Int8Array", "Int8Array")}} constructor.

Instance methods

Inherits instance methods from its parent {{jsxref("TypedArray")}}.

Examples

Different ways to create an Int8Array

// From a length
const int8 = new Int8Array(2);
int8[0] = 42;
console.log(int8[0]); // 42
console.log(int8.length); // 2
console.log(int8.BYTES_PER_ELEMENT); // 1

// From an array
const x = new Int8Array([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Int8Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(8);
const z = new Int8Array(buffer, 1, 4);
console.log(z.byteOffset); // 1

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const int8FromIterable = new Int8Array(iterable);
console.log(int8FromIterable);
// Int8Array [1, 2, 3]

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Polyfill of Int8Array in core-js

• JavaScript typed arrays

• {{jsxref("ArrayBuffer")}}

• {{jsxref("DataView")}}