The setInt8() method of DataView instances takes a number and stores it as an 8-bit signed integer in the byte at the specified byte offset of this DataView.

Try it

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);

const view = new DataView(buffer);
view.setInt8(1, 127); // Max signed 8-bit integer

console.log(view.getInt8(1));
// Expected output: 127

Syntax

setInt8(byteOffset, value)

Parameters

byteOffset

The offset, in bytes, from the start of the view to store the data in.

value

The value to set. For how the value is encoded in bytes, see Value encoding and normalization.

Return value

undefined.

Exceptions

RangeError

Thrown if the byteOffset is set such that it would store beyond the end of the view.

Examples

Using setInt8()

const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setInt8(0, 3);
dataview.getInt8(0); // 3

Specifications

Browser compatibility

See also

• JavaScript typed arrays guide
• DataView
• ArrayBuffer
• Int8Array