Last argument is a callback

gistfile1.txt

// when the last arg is a function - call it.

function test() {
	var args     = arguments.length
	  , callback = args && arguments[args - 1]
	  , result   = callback.call && callback.call();
	
	console.log(result);
}

test(1,2,3,4,5,6,7, function(){
	console.log('The answer is 42.');
	return 42;
});