Pass unknown number of arguments into javascript function

Question

Is there a way to pass an unknown number of arguments like:

var print_names = function(names) {
    foreach(name in names) console.log(name); // something li         


        

Answer 1

You can use the spread/rest operator to collect your parameters into an array and then the length of the array will be the number of parameters you passed:

function foo(...names) {
    console.log(names);
    return names;
}

console.log(foo(1, 2, 3, 4).length);

Using BabelJS I converted the function to oldschool JS:

"use strict";

function foo() {
  for (var _len = arguments.length, names = new Array(_len), _key = 0; _key < _len; _key++) {
    names[_key] = arguments[_key];
  }

  console.log(names);
  return names;
}