Int8Array

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The Int8Array typed array represents an array of 8-bit signed integers. The contents are initialized to 0 unless initialization data is explicitly provided. 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 TypedArray class.

Constructor

Int8Array(): Creates a new Int8Array object.

Static properties

Also inherits static properties from its parent TypedArray.

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

Static methods

Inherits static methods from its parent TypedArray.

Instance properties

Also inherits instance properties from its parent TypedArray.

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

Int8Array.prototype.BYTES_PER_ELEMENT: Returns a number value of the element size. 1 in the case of a Int8Array.
Int8Array.prototype.constructor: The constructor function that created the instance object. For Int8Array instances, the initial value is the Int8Array constructor.

Instance methods

Inherits instance methods from its parent 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

Specification
ECMAScript® 2026 Language Specification # table-49