DataView.prototype.setUint8()

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);

const view = new DataView(buffer);
view.setUint8(1, 255); // Max unsigned 8-bit integer

console.log(view.getUint8(1));
// Expected output: 255

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.setUint8(1, 3);
dataview.getUint8(1); // 3