files/en-us/web/javascript/reference/global_objects/dataview/getuint8/index.md

metadata

title: DataView.prototype.getUint8()
short-title: getUint8()
slug: Web/JavaScript/Reference/Global_Objects/DataView/getUint8
page-type: javascript-instance-method
browser-compat: javascript.builtins.DataView.getUint8
sidebar: jsref

The getUint8() method of {{jsxref("DataView")}} instances reads 1 byte at the specified byte offset of this DataView and interprets it as an 8-bit unsigned integer.

{{InteractiveExample("JavaScript Demo: DataView.prototype.getUint8()")}}

// 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

getUint8(byteOffset)

Parameters

• byteOffset
  • : The offset, in bytes, from the start of the view to read the data from.

Return value

An integer from 0 to 255, inclusive.

Exceptions

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

Examples

Using getUint8()

const { buffer } = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
const dataview = new DataView(buffer);
console.log(dataview.getUint8(1)); // 1

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

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