Int8Array() constructor

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() constructor creates Int8Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

Syntax

js
new Int8Array()
new Int8Array(length)
new Int8Array(typedArray)
new Int8Array(object)

new Int8Array(buffer)
new Int8Array(buffer, byteOffset)
new Int8Array(buffer, byteOffset, length)

Note: Int8Array() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

See TypedArray.

Exceptions

See TypedArray.

Examples

Different ways to create an Int8Array

js
// 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 Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also