var vs let vs const — JavaScript fundamentals 🔑 A small concept, but very important for writing bug-free code. Quick breakdown 👇 var ❌ Function scoped ❌ Can be re-declared ❌ Hoisted with undefined let ✔ Block scoped ✔ Can be re-assigned ❌ Cannot be re-declared const ✔ Block scoped ❌ Cannot be re-assigned ✔ Safer by default Best practice: Use const by default, let only when value changes, avoid var in modern JavaScript. Strong fundamentals = fewer bugs 🚀 #javascript #frontenddeveloper #webdevelopment #coding #learning #reactjs #softwareengineering
JavaScript var vs let vs const: A Quick Guide
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null vs undefined in JavaScript 🧠 These two confuse almost every beginner. But the difference is actually simple. undefined 👇 • JavaScript assigns it automatically • Variable is declared but not given a value • Means “value not available yet” null 👇 • Assigned intentionally by the developer • Means “empty on purpose” • Used to clear or reset a value Simple way to remember: undefined → JS did it null → YOU did it Understanding this helps avoid unexpected bugs and confusion in real projects 🚀 #javascript #frontenddeveloper #webdevelopment #coding #learningjavascript #reactjs #softwareengineering
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