Functions with unknown amount of args.

Hi,

Yes, it is. It was only added within the last month or two though. I've just discovered that prefix increment isn't in there yet (and I think you have a typo after 'i=0'), however the following code works fine:

function add() {
  var i, len, result = 0;
  for (i = 0, len = arguments.length; i < len; i++) {
  result += arguments[i];
  }
  return result;
}
add(3, 7, 4, 6);  //result = 20