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
Int8Arrayobject.
Static properties
Also inherits static properties from its parent TypedArray.
Int8Array.BYTES_PER_ELEMENT-
Returns a number value of the element size.
1in the case ofInt8Array.
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.
1in the case of anInt8Array. Int8Array.prototype.constructor-
The constructor function that created the instance object. For
Int8Arrayinstances, the initial value is theInt8Arrayconstructor.
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 # sec-typedarray-objects |