node.js synchronize multiple actions

synchro.js

/*
A simple and elegant function to synchronize multiple functions that expect callback as their last parameter.

example: 
  sync(func1, [parms], func2, func3, func4, [parms], callback);

Public domain!!

please leave me a comment if you like it!
*/

function sync() {
	var args = Array.prototype.slice.call(arguments);
	var callback = args.slice(-1)[0];
	args = args.slice(0,-1);
	// Prep the results data set
	var results = [];
	var l = args.length;
	for (var i = 0; i < l; i++) {
		if (typeof args[i] == "function")
			results.push([args[i], null, null]);
		else
			results[results.length-1][1] = args[i];
	}
	var do_nothing = false;
	// handle all callbacks here
	function doCallback() {
		var done = true;
		var result_parms = [];
		results.forEach(function(value, key) {
			result_parms[key] = value[2];
			done = done && (value[2] !== null);
		});
		if (done) {
			do_nothing = true;
			callback(result_parms);
		}
	}
	
	results.forEach(function(result, key, original) {
		function cb() {
			if (!do_nothing) {
				result[2] = Array.prototype.slice.call(arguments);
				doCallback();
			}
		}

		process.nextTick(function() {
			args = Array.prototype.slice.call(result[1]);
			args.push(cb);
			result[0].apply(null, args);
		});
	});
}