oop-inheritance-composition

Inheritance vs composition requires evaluating class extensibility; inheritance creates rigid hierarchies while composition builds flexible structures by assembling separate components. This Skill demonstrates strategic application of both approaches to build maintainable object-oriented systems across multiple languages.

To implement composition, you assemble classes from distinct component objects rather than extending base classes. This Skill provides concrete examples of building class structures using composition in Java, Python, and C# to achieve loose coupling.

The mixin pattern combines multiple functionalities by injecting methods into classes without rigid inheritance. This Skill demonstrates applying mixins in Python to compose behaviors dynamically, which provides flexibility that traditional class hierarchies lack.

This object-oriented design guidance supports TypeScript and C# class structures by providing language-specific examples. It covers inheritance fundamentals in TypeScript and composition patterns in C#, ensuring the principles apply across your technology stack.

Applying the Interface Segregation Principle involves splitting bloated interfaces into smaller, specific ones so classes implement only needed methods. This Skill explains applying this principle in Java to prevent forced dependencies and maintain extensible structures.

You should not use inheritance when behaviors change dynamically or when hierarchies risk deep coupling. This Skill addresses these limitations by showing how composition and patterns like strategy provide flexible, maintainable alternatives for extending object structures.