OOP

What this skill is about

Encapsulation · polymorphism · SOLID

Topics we drill

• Four pillars (encapsulation, inheritance, polymorphism, abstraction)
• SOLID principles in practice
• Composition vs inheritance
• Design patterns (Strategy, Observer, Factory)
• Common smells + refactoring

Why this matters at interviews

Real interviewers don’t just check if you know the syntax — they probe whether you’ve used the concept under production pressure. Our drills mirror that. Adaptive difficulty, named anti-patterns called out as you go, and a senior-staff voice that teaches the production vocabulary rather than dumbing it down.