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Easy JavaScript Interview Questions

This section contains basic JavaScript interview questions designed for beginners. Click on each question to see its detailed answer.

  1. What is JavaScript, and why is it used ? ✅
  2. What are variables in JavaScript, and how do you declare them ? ✅
  3. What are JavaScript data types ? ✅
  4. What is the purpose of the typeof operator in JavaScript ? ✅
  5. What are JavaScript objects and how do you create them ? ✅
  6. What is a prototype in JavaScript, and how does it work? ✅
  7. What are arrays in JavaScript ? ✅
  8. What is the purpose of the alert, prompt, and confirm methods in JavaScript ? ✅
  9. What are template literals in JavaScript, and how are they used ? ✅
  10. What is the purpose of the break and continue statements in JavaScript loops ? ✅
  11. What is the difference between undefined and not defined in JavaScript ? ✅
  12. What are JavaScript events, and how do you handle them ? ✅
  13. What is the difference between var, let, and const in JavaScript ? ✅
  14. What are Truthy and Falsy values in JavaScript ? ✅
  15. Explain scopes (Global, Local, Functional, Block). ✅
  16. Explain DOM Tree ? ✅
  17. What are arrow functions and how are they different from regular functions ? ✅
  18. What is the difference between null and undefined ? ✅
  19. What is the Difference Between == and === in JavaScript ? ✅
  20. How do loops work in JavaScript ? ✅