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#

bash

scripts/script.sh intro

OOP fundamentals — classes, objects, the four pillars.

solid#

bash

scripts/script.sh solid

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

inheritance#

bash

scripts/script.sh inheritance

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

patterns#

bash

scripts/script.sh patterns

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

access#

bash

scripts/script.sh access

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

abstract#

bash

scripts/script.sh abstract

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

pitfalls#

bash

scripts/script.sh pitfalls

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

comparison#

bash

scripts/script.sh comparison

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

help#

bash

scripts/script.sh help

version#

bash

scripts/script.sh version

Configuration#

VariableDescriptionCLASS_DIRData directory (default: ~/.class/)

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