Question

I would like to write a javascript function that works something like this…

f([["a"]], function(e){alert(e);});
// results in alert("a");

f([["a"], ["b"]], function(e1,e2){alert(e1 + ":" + e2);});
//results in alert("a:b");

f([["a", "b"], ["c"]], function(e1,e2){alert(e1 + ":" + e2);});
//results in alert("a:c");alert("b:c");

I can think of a recursive solution for the looping, but how do I send a “unknown” number of variables to a function?

Answer 1

If you put all your arguments into an array (lets call it foo), you can call a function fn with those arguments by using the apply-function.

fn.apply(null, foo)

The first argument (null in this case) is whatever you want this to be inside of the called function. null will probably work for you.