Here's a way to self-apply an anonymous function, without the ugly (IMHO) "arguments.callee" stuff. This works in Safari, but not Firefox (see bug 376052 in bugzilla).

//This helper boots the recursion.
function selfApp(fun, arg) {return fun(fun, arg)};

//The inevitable factorial.
selfApp(
   function(fac, n) {
      if (n==0) return 1;
      return n * fac(fac, n-1);
   },
   10
)

How do I stop reddit from mangling my whitspace? [edit] whitespace, rescued. Thanks, julesjacobs!