Simple Async handling

somethingAsync

var uselessAsync = {};

	uselessAsync.parallel = function(tasks, callback) {
		var completed = 0;
		var finalData = [];


		var cb = function(err, data, iter) {
			
			completed++;
			finalData[iter] = data;
			if(completed === tasks.length) {
				callback(finalData);
			}
		};
		
		//Loop through the tasks and exceute them by passing in callback which excutes and checks 
		//for the counter variable if equal to number of tasks then it assumes it to be last 
		//task and then executes the main callback the user gives.
		
		for(var i = 0 ; i < tasks.length; i++) {
			
			tasks[i]((function(ii) {
				return function(err, data) {
					cb(null, data, ii);
				};	
			}(i)));

		}
	};

How to use

uselessAsync.parallel([
        function(cb) {
            setTimeout(function() {

                cb(null,'one');
            }, 3000);
        },
        function(cb) {
            setTimeout(function() {
                cb(null,'Two');
            }, 1000);
        },
        function(cb) {
            setTimeout(function() {
                cb(null,'Three');
            }, 5000);
        } 

        ], function(data) {
            console.log(data);
                        //Outputs as ['one', 'two', 'three']
        });