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 create a function using the spread/rest operator and from there on, you achieved your goal. Please take a look at the chunk below.

const print_names = (...args) => args.forEach(x => console.log(x));

Answer 2

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).

Answer 3

function print_args() {
    for(var i=0; i<arguments.length; i++)
        console.log(arguments[i])
}

Answer 4

let x = function(){
  return [].slice.call(arguments);
};

console.log(x('a','b','c','d'));

Answer 5

arguments.length. you can use a for loop on it.

(function () {
    for (var a = [], i = arguments.length; i--;) {
        a.push(arguments[i]);
    };
    return a;
})(1, 2, 3, 4, 5, 6, 7, 8)

Answer 6

var 
print_names = function() {
    console.log.apply( this, arguments );
};

print_names( 1, 2, 3, 4 );