javascript function unknown number of argument code example

Example 1: Pass unknown number of arguments into javascript function

var print_names = function(...names) {
    for (let i=0; i<names.length; i++) console.log(names[i]);
}

Example 2: javascript unknown number of parameters

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

add(2, 3);
add(5, 3, 7, 2);