This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The byteLength accessor property represents the length of an SharedArrayBuffer in bytes.
sab.byteLength
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.
var sab = new SharedArrayBuffer(1024); sab.byteLength; // 1024
| Specification | Status | Comment |
|---|---|---|
| ECMAScript Shared Memory and Atomics The definition of 'SharedArrayBuffer.prototype.byteLength' in that specification. | Draft | Initial definition. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | 52 (52) [1] | No support | No support | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | 52.0 (52) [1] | No support | No support | No support |
[1] In Firefox version 46 until version 51, this feature was disabled by a preference setting. In about:config, set javascript.options.shared_memory to true.
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer/byteLength