Async

var async = {
    waterfall: function (listOfRequests, callback) {
        var callbacks = 0;
        function handleCallback() {
            callbacks++;
            if (callbacks === listOfRequests.length) {
                callback();
            } else {
                listOfRequests[callbacks](handleCallback);
            }
        }
        if (listOfRequests[0]) {
            listOfRequests[0](handleCallback);
        }
    },
    parallel: function(listOfRequests, callback){
        var callbacks = 0;
        function handleCallback(){
            callbacks++;
            if (callbacks === listOfRequests.length) callback();
        }
		
        for (var i = 0; i < listOfRequests.length; i++){
            listOfRequests[i](handleCallback);
        }
    }
}

test

async.waterfall([function (cb) {
    setTimeout(function () {
        console.log('1');
        cb();
    }, 10);
}, function (cb) {
    console.log('2');
    cb();
}, function (cb) {
    setTimeout(function () {
        console.log('3');
        cb();
    }, 100);
}], function () { console.log('done') });