Complete Programming Interview Guide

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4 Principles of OOP | The Foundation of Clean Code

Object-Oriented Programming is built on four core principles that make code cleaner, reusable, and easier to maintain.

🔹 Abstraction
Focus on what an object does, not how it does it.
Expose only essential features and hide complexity.

🔹 Encapsulation
Bundle data and methods together.
Protect internal state by controlling access with modifiers.

🔹 Polymorphism
One interface, many forms.
The same method can behave differently based on the object or context.

🔹 Inheritance
Reuse and extend existing code.
Create new classes based on existing ones to avoid duplication.

Why it matters:
Mastering these principles helps you design scalable systems and write professional, production-ready code.

https://www.freecodecamp.org/news/how-to-build-projects-as-a-junior-developer/

How to Build Successful Projects as a Junior Developer Several months ago, I stumbled upon a coding challenge that intrigued me. Here's what it was: > Fun frontend question I was asked in an interview one time Build six squares with no color Every time you click one, it turns green When the last square turns green, they all