files/en-us/web/javascript/reference/global_objects/dataview/setuint8/index.md

metadata

title: DataView.prototype.setUint8()
short-title: setUint8()
slug: Web/JavaScript/Reference/Global_Objects/DataView/setUint8
page-type: javascript-instance-method
browser-compat: javascript.builtins.DataView.setUint8
sidebar: jsref

The setUint8() method of {{jsxref("DataView")}} instances takes a number and stores it as an 8-bit unsigned integer in the byte at the specified byte offset of this DataView.

{{InteractiveExample("JavaScript Demo: DataView.prototype.setUint8()")}}

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

const view = new DataView(buffer);
view.setUint8(1, 255); // Max unsigned 8-bit integer

console.log(view.getUint8(1));
// Expected output: 255

Syntax

setUint8(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

{{jsxref("undefined")}}.

Exceptions

• {{jsxref("RangeError")}}
  • : Thrown if the byteOffset is set such that it would store beyond the end of the view.

Examples

Using setUint8()

const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setUint8(0, 3);
dataview.getUint8(0); // 3

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• JavaScript typed arrays guide
• {{jsxref("DataView")}}
• {{jsxref("ArrayBuffer")}}
• {{jsxref("Uint8Array")}}