SharedArrayBuffer.prototype.byteLength
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2021.
The byteLength
accessor property of SharedArrayBuffer
instances returns the length (in bytes) of this SharedArrayBuffer
.
Try it
// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(8);
console.log(buffer.byteLength);
// Expected output: 8
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 the shared array is constructed and cannot be changed.
Examples
Using byteLength
js
const sab = new SharedArrayBuffer(1024);
sab.byteLength; // 1024
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-get-sharedarraybuffer.prototype.bytelength |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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byteLength |
Legend
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- Full support
- Full support
- No support
- No support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.