...REST

rest.js

// functions REST
const add = function (...numbers) {
  let sum = 0;
  for (let i = 0; i < numbers.length; i++) sum += 
  numbers[i];
  console.log(sum);
};

add(2, 3);
add(5, 6, 7, 8, 9);
add(1, 2, 3, 4, 5, 6, 7, 8, 9);