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TypedArray.prototype.byteLength

The byteLength accessor property represents the length (in bytes) of the typed array.

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Description

The byteLength property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when a TypedArray is constructed and cannot be changed. If the TypedArray is not specifying a byteOffset or a length, the length of the referenced ArrayBuffer will be returned. TypedArray is one of the TypedArray objects.

Examples

Using the byteLength property

const buffer = new ArrayBuffer(8);

const uint8 = new Uint8Array(buffer);
uint8.byteLength; // 8 (matches the byteLength of the buffer)

const uint8newLength = new Uint8Array(buffer, 1, 5);
uint8newLength.byteLength; // 5 (as specified when constructing the Uint8Array)

const uint8offSet = new Uint8Array(buffer, 2);
uint8offSet.byteLength; // 6 (due to the offset of the constructed Uint8Array)

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
byteLength
7
12
4
10
11.6
5.1
4
18
4
12
4.2
1.0
1.0
0.10.0

See also

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/byteLength