deferred.js

// so this is a basic deferred

var Promise = function() {
        this.successCallbacks = [];
        this.failCallbacks = [];
};

Promise.prototype.then = function(successCallback, failCallback) {
        if (successCallback) this.successCallbacks.push(successCallback);
        if (failCallback) this.failCallbacks.push(failCallback);
};

var Deferred = function() {
        this.promise = new Promise();
};

Deferred.prototype.resolve = function(value) {
        this.promise.successCallbacks.forEach(function(callback) {
                callback(value);
        });
};

Deferred.prototype.reject = function(value) {
        this.promise.failCallbacks.forEach(function(callback) {
                callback(value);
        });
};

// okay so i think thats right now, and we'd use it like this

var waitFiveSeconds = function() {
        var fiveSecondDeferred = new Deferred();
        var fiveSecondTimeout = setTimeout(function() {
                fiveSecondDeferred.resolve('its been like five seconds');
        }, 5000);
        return fiveSecondDeferred.promise;
};

waitFiveSeconds().then(function(message) {
        console.log('moooo~');
        console.log(message);
});
console.log('cows say... ');