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function ResourceBuilder(){
this._dependencyPromises = [];
}
ResourceBuilder.prototype._load = function () {
// specific to the resource...
};
ResourceBuilder.prototype.addDependency = function(dep){
this._dependencyPromises.add(dep);
}
ResourceBuilder.protototype.get = function(){
return Promise.all([this._load()].concat(this._dependencyPromises)).then(function(){
// both the resource and its dependencies are now loaded
// this was done in parallel.
});
}
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