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

DataView.prototype.buffer - JavaScript | MDN

DataView.prototype.buffer

Baseline Widely available

The buffer accessor property of DataView instances returns the ArrayBuffer or SharedArrayBuffer referenced by this view at construction time.

Try it
// Create an ArrayBuffer
const buffer = new ArrayBuffer(123);

// Create a view
const view = new DataView(buffer);

console.log(view.buffer.byteLength);
// Expected output: 123
Description

The buffer 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 DataView is constructed and cannot be changed.

Examples Using the buffer property
const buffer = new ArrayBuffer(8);
const dataview = new DataView(buffer);
dataview.buffer; // ArrayBuffer { byteLength: 8 }
Specifications Browser compatibility See also

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