The length accessor property of TypedArray instances returns the length (in elements) of this typed array.
TypedArray.prototype.length
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Description
The length 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 length property
js
const buffer = new ArrayBuffer(8);
let uint8 = new Uint8Array(buffer);
uint8.length; // 8 (matches the length of the buffer)
uint8 = new Uint8Array(buffer, 1, 5);
uint8.length; // 5 (as specified when constructing the Uint8Array)
uint8 = new Uint8Array(buffer, 2);
uint8.length; // 6 (due to the offset of the constructed Uint8Array)
Specifications
Browser compatibility
| Desktop | Mobile | Server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
length |
7 | 12 | 4 | 11.6 | 5.1 | 18 | 4 | 12 | 4.2 | 1.0 | 4 | 1.0 | 0.10.0 | |
See also
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/length