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core-engineering

Explains OOP and SOLID principles with TypeScript/JavaScript code examples.

Updated Mar 20, 2026
Search Tags:#inheritance#abstraction#oop#encapsulation#clean-code#polymorphism#solid-principles
One-click install
npx skills add https://github.com/JustineDevs/E-Commerce --skill core-engineering-justinedevs
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: core-engineering
Source: https://github.com/JustineDevs/E-Commerce/tree/main/.claude/skills/core-engineering
Command: npx skills add https://github.com/JustineDevs/E-Commerce --skill core-engineering-justinedevs

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Object-oriented design and SOLID principles provide a structured framework to build maintainable, robust AI agents and software systems. It clarifies how to reason about abstractions, encapsulation, inheritance, polymorphism, and clean-code practices to reduce complexity and improve long-term adaptability.

Core Features & Use Cases

  • Comprehensive explanation of the Four Pillars of OOP: Abstraction, Encapsulation, Inheritance, and Polymorphism.
  • Clear coverage of SOLID principles (SRP, OCP, LSP, ISP, DIP) and how they interrelate with composition over inheritance.
  • Practical code examples across languages (TypeScript/JavaScript style) illustrating how to apply these principles in real-world software design.
  • Use cases include structuring AI agent architectures, modular systems, and maintainable codebases that scale with evolving requirements.

Quick Start

Refactor a small class design to demonstrate abstraction and encapsulation, then apply SOLID principles in a step-by-step improvement.

Frequently Asked Questions about core-engineering

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I apply SOLID principles in TypeScript to structure maintainable software?▼

To apply SOLID principles in TypeScript, you refactor classes to handle single responsibilities, use interfaces for abstraction, and favor composition over inheritance, resulting in maintainable software systems.

What is the difference between composition and inheritance in object-oriented design?▼

In object-oriented design, composition involves building classes by containing other objects, whereas inheritance extends classes directly, with composition often preferred to reduce coupling and improve long-term adaptability.

How do I structure AI agent architectures using object-oriented programming?▼

Structure AI agent architectures using object-oriented programming by applying encapsulation to hide internal state, abstraction for complex logic, and polymorphism to handle varying agent behaviors modularly.

Can I use clean-code practices and OOP concepts to refactor existing JavaScript codebases?▼

Yes, you can refactor existing JavaScript codebases by applying OOP concepts and clean-code practices, using step-by-step improvements to demonstrate abstraction, encapsulation, and SOLID principles.

When should I avoid inheritance in favor of polymorphism and interfaces?▼

Avoid deep inheritance hierarchies when subclasses do not strictly substitute their parents, violating the Liskov Substitution Principle; instead, use polymorphism and interfaces to decouple behaviors.

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