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
scripts/script.sh intro
OOP fundamentals — classes, objects, the four pillars.
solid
scripts/script.sh solid
SOLID principles — SRP, OCP, LSP, ISP, DIP explained with examples.
inheritance
scripts/script.sh inheritance
Inheritance vs composition — when to use each, diamond problem, mixins.
patterns
scripts/script.sh patterns
Essential design patterns — Factory, Strategy, Observer, Singleton, Builder.
access
scripts/script.sh access
Access modifiers and encapsulation — public, private, protected across languages.
abstract
scripts/script.sh abstract
Abstract classes, interfaces, and protocols — contracts and polymorphism.
pitfalls
scripts/script.sh pitfalls
Common OOP pitfalls — God class, deep hierarchies, over-engineering.
comparison
scripts/script.sh comparison
OOP across languages — Java, Python, TypeScript, Go, Rust.
help
scripts/script.sh help
version
scripts/script.sh version
Configuration
| Variable | Description |
|---|---|
CLASS_DIR |
Data directory (default: ~/.class/) |
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