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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/length below:

TypedArray.prototype.length - JavaScript | MDN

Baseline Widely available

The length accessor property of TypedArray instances returns the length (in elements) of this typed array.

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer, 2);

console.log(uint8.length);
// Expected output: 6

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.

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)

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