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

ES6/ES2015

Take advantage of the rest parameter syntax.

function printNames(...names) {
  console.log(`number of arguments: ${names.length}`);
  for (var name of names) {
    console.log(name);
  }
}

printNames('foo', 'bar', 'baz');

There are three main differences between rest parameters and the arguments object:

• rest parameters are only the ones that haven't been given a separate name, while the arguments object contains all arguments passed to the function;
• the arguments object is not a real array, while rest parameters are Array instances, meaning methods like sort, map, forEach or pop can be applied on it directly;
• the arguments object has additional functionality specific to itself (like the callee property).