JavaScript Data Types Explained | Dynamic Typing, null, undefined & NaN | Quirks | Coercion
Автор: hosiyar
Загружено: 2026-01-11
Просмотров: 145
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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.
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