number_compress.js

// @ts-check

const BITS = 8;
function encode(...nums: number[] ) {
  let num = 0;
  for (let i = 0; i < nums.length; i++) {
    num |= nums[i] << (i * BITS);
  }

  return num;
}

function decode(num: number, amount: number) {
  const arr = [];
  const mask = 2 ** BITS - 1;
  for (let i = 0; i < amount; i++) {
    arr.push(num & mask);
    num >>= BITS;
  }

  return arr;
}

console.log(encode(2))
console.log(decode(encode(1),1))

const BITS = 8;
function decode(num: number, amount: number) {
  const arr = [];
  const mask = 2 ** BITS - 1;
  for (let i = 0; i < amount; i++) {
    arr.push(num & mask);
    num >>= BITS;
  }

  return arr;
}