As an application grows, controllers may bloat as we add code to coordinate behavior between multiple objects. In our Spacetraders web client, we’ve established a highly functional core loop – accept user input, call the API, process the response, and update the UI. As we add new features—automations, logging, reminders, and more—our neat controller methods can quickly become tangled, copy-pasted messes. In this article, I’ll show you how to facilitate communication between related classes without putting all your eggs in your controller’s basket. by Oscar Merida