Hoisting — When JavaScript Reads Before You Write 🪄 | var vs let vs const Explained

Ever seen JavaScript run code before you write it? That’s hoisting — one of the most misunderstood parts of JS execution.

In this short, we break down how functions, var, let, and const are hoisted differently, why the Temporal Dead Zone (TDZ) exists, and how a single var in a loop can crash production async code 😱.

🧠 Topics covered:

How JavaScript’s creation and execution phases work

Function vs variable hoisting

Why var leads to hidden async bugs

TDZ and safer scoping with let and const

Real-world example: async loop bug with var

💡 Modern best practices:

// ✅ Prefer const
// ✅ Use let when needed
// ❌ Avoid var in new code


🔍 Learn something new every day — subscribe for #DailyDevDose of short, technical, developer-first content.

#JavaScript #WebDevelopment #CodingShorts #Hoisting #AsyncJS #LetVsConst #FrontendDev #CodeTips #DeveloperLife