(function() {
	// this is the "global" store. the function below has access to it because of closure
	var store = {}

	function librarySystem(name, dependencies, libraryCallback) {
		if(arguments.length < 2) {
			return store[name];
		} else {
			if(dependencies.length > 0) {
				// map the returned dependency to the passed in string array
				dependencies = dependencies.map(function(library) {
					if(Array.isArray(library)) {
						librarySystem(name, library, libraryCallback)
					} else {
						return store[library];
					}
				})
				// run the callback with passed in libraries
				store[name] = libraryCallback.apply(this, dependencies);
			} else {
				store[name] = libraryCallback();
			}
		}
	}
	window.librarySystem = librarySystem;
})();