DataView()

// ArrayBuffer 
const buffer = new ArrayBuffer(16);

// 
const view1 = new DataView(buffer);
const view2 = new DataView(buffer, 12, 4); // 12  4 
view1.setInt8(12, 42); // 42  12 

console.log(view2.getInt8(0));
// : 42

new DataView(buffer)
new DataView(buffer, byteOffset)
new DataView(buffer, byteOffset, byteLength)

const buffer = new ArrayBuffer(16);
const view = new DataView(buffer, 0);

view.setInt16(1, 42);
view.getInt16(1); // 42