core-engineering
Object-Oriented Design Skill
This skill defines Core Engineering: Object-Oriented Programming (OOP), SOLID, clean-code principles, and relationship types with concrete examples so an AI agent or developer can apply them consistently.
1. Four Pillars of OOP
1.1 Abstraction
What it is: Focus on what an object does, not how. Hide complex details and expose only essential behavior.
How it looks: Public methods define the contract; internals are private or hidden.
// Abstraction: caller uses start() and stop() without knowing engine details
class Car {
private engine: Engine;
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