How to write a JS function that accepts and "forwards" variable number of parameters?

Question

How do I write a Javascript function that accepts a variable number of parameters, and forwards all of those parameters to other anonymous functions?

For example, consider the scenario of a method that fires an event:

function fireStartedEvent(a,b,c,d,e,f,g,...) {
    for(var i = 0; i < startedListeners.length; i++) {
        startedListeners[i](a,b,c,d,e,f,g,...);
    }
}

Especially since I have an event factory that generates these fire methods, these methods have no interest in knowing how many parameters a given event or its handlers consume. So I have it hard-wired at 7 right now (a through g). If it's any less, no problem. If it's any more, they get cut off. How can I just capture and pass on all parameters?

Thanks.

(Using jQuery or any other Javascript framework is not an option here.)

Answer 1

This link explains it all.

It covers the use of 'arguments' and 'apply' giving several examples as well as showing other features of the Javascript language.

Answer 2

I think "apply" and "arguments" are two JavaScript concepts you can use here:

function fireStartedEvent() {
  for (var i = 0; i < startedListeners.length; i++) {
    startedListeners[i].apply(startedListeners[i], arguments);
  }
}

Here's some code from my Firebug console I tried this out with:

a = function(foo) { alert('a: ' + foo); };
b = function(foo, bar) { alert('b: ' + foo + ', ' + bar); };

startedListeners = [a, b];

function fireStartedEvent() {
  for (var i = 0; i < startedListeners.length; i++) {
    startedListeners[i].apply(startedListeners[i], arguments);
  }
}


fireStartedEvent('one', 'two');