Controller is a component in software architecture that handles user input, manages application flow, and coordinates interactions between models and views. In web development frameworks like Ruby on Rails or ASP.NET MVC, the controller acts as an intermediary, processing incoming HTTP requests, retrieving or updating data from models, and preparing the appropriate response to be rendered by the view.

How to use it in a sentence

• "I need to add a new endpoint to the UserController to handle profile updates," grumbled the engineer, dreading the thought of untangling the spaghetti code left by the previous developer who rage-quit to join a blockchain startup.

• The tech lead, in a futile attempt to sound hip and relevant, declared, "We'll use a controller to manage the chat bot's responses, because that's what all the cool kids at Facebook are doing these days, right?"

If you actually want to learn more...

• Dependency Composition - This article explores creating a top-rated handler for a restaurant rating system, focusing on the controller module's brittleness and the need for comprehensive tests.

• GUI Architectures - This piece dives into the Model View Controller (MVC) pattern, emphasizing the separation between domain objects and presentation objects, and how controllers manage user input and determine subsequent actions.

• The Practical Test Pyramid - This article highlights the importance of unit tests for all production code classes, including controllers, and provides guidance on writing effective tests using patterns like "Arrange, Act, Assert" or "given, when, then."

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