Mastering JavaScript Variables: var, let, and const

📌 Understanding JavaScript variables is key to writing efficient and bug-free code. But should you use var, let, or const? Let's break it down!

🔹 What Are JavaScript Variables?

Variables are containers for storing data in JavaScript. However, with the introduction of ES6, we now have three ways to declare them:

• var – The old way (function-scoped, hoisting issues)
• let – The modern, block-scoped approach
• const – The immutable, block-scoped option

Still confused? 🎥 Watch my latest tutorial for a deep dive into JavaScript variables!

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🚀 Key Differences: var vs let vs const

Feature	var	let	const
Scope	Function-scoped	Block-scoped	Block-scoped
Hoisting	Hoisted (undefined)	Hoisted (uninitialized)	Hoisted (uninitialized)
Reassignment	✅ Yes	✅ Yes	❌ No
Best Practice?	❌ Avoid	✅ Use for mutable values	✅ Use for constants

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🛑 Why Avoid var?

Using var can lead to unexpected bugs because of its function-scoped nature and hoisting behavior. Example:

console.log(name); // ❌ Undefined (Hoisting issue)
var name = "Sam";

Whereas with let and const:

console.log(name); // ❌ ReferenceError (Not hoisted)
let name = "Sam";

Best Practice:

✔ Use const by default.

✔ Use let if reassignment is needed.

✔ Avoid var unless you absolutely must support old browsers.

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📺 Watch the Full Tutorial

For practical examples and best practices, watch my latest YouTube video:

👉 JavaScript Variables Explained

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