javascirpt arguments object
// With Rest Parameter
let sum = (...nums) => {
  let total = 0;
  for (let num of nums) {
    total += num;
  }
  return total;
};
console.log(sum(4, 23, 65, 2)); // 94
// Before
function sum() {
  let total = 0;
  for (let argument of arguments) {
    total += argument;
  }
  return total;
}
console.log(sum(4, 23, 65, 2)); // 94