JavaScript Interview Questions 2026 | What is a Closure in JavaScript? | Frontend Prep 🚀

🔥 Want to master JavaScript Closures and crack your next Frontend Developer interview?

In this video, you'll learn one of the most important JavaScript concepts: Closures.

✅ What is a Closure?
✅ How Closures Work Internally
✅ Lexical Scope Explained
✅ Real-World Examples
✅ Private Variables Using Closures
✅ Function Factories
✅ Common Interview Questions
✅ Frontend & React Use Cases

📌 Example:

function outer() {
let count = 0;
function inner() {
count++;
console.log(count);
}
return inner;
}

const counter = outer();
counter(); // 1
counter(); // 2
counter(); // 3

💡 Explanation:

The inner() function forms a closure because it remembers the variable count from its outer function even after outer() has finished executing.

Output:
1
2
3

🎯 Why are Closures Important?

✔ Data Privacy
✔ State Management
✔ Event Handlers
✔ Callbacks
✔ React Hooks Understanding
✔ Frequently Asked in Interviews

👨‍💻 Perfect For:

• JavaScript Beginners
• Frontend Developers
• React Developers
• Web Developers
• Software Engineers
• Interview Preparation

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