Class — Object-Oriented Programming Reference

Quick-reference skill for OOP concepts, class design, SOLID principles, and common design patterns.

When to Use

• - Designing class hierarchies and choosing inheritance vs composition
• Applying SOLID principles to refactor code
• Understanding polymorphism, encapsulation, and abstraction
• Choosing the right design pattern for a problem
• Comparing OOP across languages (Java, Python, TypeScript, C++)

Commands

intro

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OOP fundamentals — classes, objects, the four pillars.

solid

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SOLID principles — SRP, OCP, LSP, ISP, DIP explained with examples.

inheritance

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Inheritance vs composition — when to use each, diamond problem, mixins.

patterns

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Essential design patterns — Factory, Strategy, Observer, Singleton, Builder.

access

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Access modifiers and encapsulation — public, private, protected across languages.

abstract

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Abstract classes, interfaces, and protocols — contracts and polymorphism.

pitfalls

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Common OOP pitfalls — God class, deep hierarchies, over-engineering.

comparison

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OOP across languages — Java, Python, TypeScript, Go, Rust.

help

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version

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Configuration