What is ArrayBuffer in JavaScript?

ArrayBuffer in JavaScript is a pure byte array, where each elements are stored in contigous memory locations. The old array, new Array() behaves like an array, but in the core it does not store elements in contigous memory.

const a = new ArrayBuffer(6);
console.log(a);

For the code above the output will be:

ArrayBuffer { [Uint8Contents]: <00 00 00 00 00 00>, byteLength: 6 }

The 00 00 00 00 00 00 are the 6 contigous memory locations. Each memory location is treated as an Uint8 data.