js-promise-chaining.js

var next = function(p, $scope) {
    var create = function($scope, time) {
        var time = time || 1000;
        return new Promise(function(resolve, reject) {
            setTimeout(function() {
                console.log("Promise: " + $scope.val);
                $scope.val++;
                resolve($scope);
            }, time);
        });
    };

    if ($scope) {
        return create($scope);
    }

    return p.then(function ($scope) {
        return create($scope);
    });
};

var i = 0;
var $scope = {
    val: i
};

var p = next(p, $scope);
for (i = 4; i > 0; i--) {
    console.log("Iteration: " + i);
    p = next(p);
}

/* Also I've found some related articles for further reading:

 > http://12devs.co.uk/articles/promises-an-alternative-way-to-approach-asynchronous-javascript/
 > http://www.dustindiaz.com/async-method-queues
 > http://solutionoptimist.com/2013/12/27/javascript-promise-chains-2/
 
 */