gistfile1.txt

function ResourceBuilder(){
    this._dependencies = [];
}

ResourceBuilder.prototype.addDependency = function(dep){
    this._dependencies.add(dep);
}
ResourceBuilder.protototype.get = function(){
     var loadPromises = this._dependencies.map(loadDependency); // alternatively, dependencies could be promises already
     return Promise.all(loadPromises).then(function(loadedResourcesArray){
         // do something with obj, or return the resource
     });
}