JavaScript Data Types Explained | Dynamic Typing, null, undefined & NaN | Quirks | Coercion

Welcome to Video #2 of our JavaScript Mastery series 🚀

In this video, we dive into JavaScript Data Types and the unique behaviors that often confuse beginners.
JavaScript is a dynamically typed language, and understanding this properly will save you from many bugs and interview traps.

🧠 What you’ll learn in this video:
✔️ What dynamic typing means in JavaScript
✔️ Why JavaScript behaves differently from strongly typed languages
✔️ Classification of data types in JavaScript
• Primitive data types
• Non-primitive (reference) data types
✔️ Understanding type coercion
• Implicit vs explicit coercion
• Common coercion pitfalls
✔️ JavaScript quirks you must know
✔️ Clear explanation of
• null
• undefined
• NaN
✔️ Why typeof null behaves strangely

⚠️ Why this video is critical?
Many JavaScript bugs happen not because of syntax, but because developers misunderstand types and coercion.

This video builds mental clarity, not just rules.

🧭 Series Progress
✅ Video #0: JavaScript Basics – START HERE
✅ Video #1: Variables in JavaScript
▶️ Video #2: Data Types & Dynamic Typing (this video)
⏭️ Next: Operators & Expressions

👉 Follow the playlist in order for best results.

👨‍🎓 Who should watch this?
Beginners learning JavaScript
Students preparing for interviews
Developers confused by null, undefined, and NaN

📌 Strong fundamentals now will make functions, objects, and frameworks easy later.