Top 3 JavaScript Interview Questions Every Developer Should Know

Top 3 JavaScript Interview Questions

If you’re preparing for your next JavaScript developer role, it pays to nail the fundamentals and show off your problem‑solving skills. Here are three common questions you might face:

1. Explain closures in JavaScript.

   Discuss how a function can access variables from its outer scope, even after that outer function has returned. Bonus points if you give a short example.

2. What’s the difference between var, let, and const?

   Cover scope, hoisting, and reassignment rules for each keyword, with a quick code snippet to illustrate.

3. How does asynchronous code work in JavaScript?

   Talk about the event loop, callbacks, promises, and async/await. Interviewers love seeing that you understand execution flow.

💡 Pro tip: Don’t just memorize answers — be ready to explain concepts in your own words and connect them to real‑world scenarios from your experience.