Resolve a dependency recursively based on .needs

gistfile1.js

// this will load a script, I assume each dependency contains what it needs inside 
// `dependency.needs` and we'll load that. 
//
//  stuff is called script here, but it could also be a stylesheet or whatever. 
//
// Since when we return a promise from a `.then` it unwraps and runs the promise we return, we can
// return a promise for the values of our _own_ dependencies, and continue doing so, promises will 
// unwrap everything for us.
//
// This does not do have the same `.addDependency` interface from before, it's just a function to show
// a concept, but if it 

// Assume a magical scriptFromName function exists that takes a script name returns the document's script element for it.

function resolve(script){
    var needs = script.needs; // what we need
    var needsDependencies = needs.map(function(need){ // we take each need
        var dependencyData = scriptFromName(need); // this function gets the dependency
        return resolve(dependencyData); // so, we're resolving the dependencies for it too
    });
    rerturn Promise.all(needsDependencies) // when all my dependencies resolved their own dependencies
                   .then(function(dependentScripts){ // all the scripts have also run here, we'll see how soon
                       script.execute(); // execute this script, since all the dependent scripts were 
                                         // themselves resolved, we can safely assume our dependencies are met now
                   }); // we also return a promise here, so we can hook on when it's done, 
                       //note we used this in our resolve call above
}