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.
TheInt8Array() constructor createsInt8Array objects. The contents are initialized to0 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)Parameters
SeeTypedArray.
Exceptions
SeeTypedArray.
Examples
Different ways to create an Int8Array
js
// From a lengthconst int8 = new Int8Array(2);int8[0] = 42;console.log(int8[0]); // 42console.log(int8.length); // 2console.log(int8.BYTES_PER_ELEMENT); // 1// From an arrayconst x = new Int8Array([21, 31]);console.log(x[1]); // 31// From another TypedArrayconst y = new Int8Array(x);console.log(y[0]); // 21// From an ArrayBufferconst buffer = new ArrayBuffer(8);const z = new Int8Array(buffer, 1, 4);console.log(z.byteOffset); // 1// From an iterableconst 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-constructors |