Object-Oriented Design: Composition Over Inheritance

When building object-oriented applications, relying too heavily on inheritance often leads to rigid, tightly coupled code that is difficult to modify. By mastering object composition, you can write flexible programs that adapt to changing requirements on the fly. This text-based course guides you through the transition from static class hierarchies to dynamic runtime behavior. You will start by learning foundational object-oriented design principles, clarifying the core differences between inheritance and composition. From there, you will explore how to decouple your components, write clean interfaces, and assemble objects dynamically to modify their behavior without rewriting base classes. What you'll learn: - Understand the architectural limitations of deep inheritance hierarchies - Apply the principle of composition to build loosely coupled software systems - Implement dynamic behavior changes at runtime using modern design patterns - Use Python type hints and abstract base classes to define clear component interfaces - Refactor rigid, inherited codebases into flexible, composable structures - Practice writing unit tests for composed objects using mock interfaces This course begins with essential design terminology and core conceptual foundations before moving into step-by-step refactoring exercises and practical code implementations. You will read detailed explanations, analyze real-world software design scenarios, and complete hands-on coding exercises. This course is designed for beginner-to-intermediate developers who understand basic programming concepts and want to elevate their software architecture skills. No advanced system design experience is required. Start reading today to build adaptable, clean, and highly maintainable software.