/top-javascript-interview-questions

List of Top JavaScript Interview Questions with Answers

Top JavaScript Interview Questions and Answers

'Top JavaScript Interview Questions and Answers' contains the most frequently asked questions at these companies. These questions and answers will help you prepare for these interviews.

  1. What is Hoisting in JavaScript?
  2. What are Callbacks in JavaScript?
  3. What are Closures in JavaScript?
  4. What are async functions in JavaScript?
  5. What is the purpose of constructors in JavaScript?
  6. What is the difference between '==' and '===' in JavaScript?
  7. What is the difference between 'null' and 'undefined' in JavaScript?
  8. What are the different data types in JavaScript?
  9. What is NaN in JavaScript?
  10. What are var, const, let keywords in JavaScript?
  11. What is 'strict mode' in JavaScript?
  12. What are Arrow Functions in JavaScript?
  13. What is Object Destructuring in JavaScript?
  14. What is the Spread Syntax or Spread Operator?
  15. What is the Rest Syntax or Rest Operator?
  16. What are Higher-order functions in JavaScript?
  17. What is the difference between map() and forEach() in JavaScript?
  18. What is Immediately Invoked Function Expression (IIFE) in JavaScript?
  19. What is the purpose of the 'this' operator in JavaScript?
  20. What are Promises in JavaScript?
  21. What are events in JavaScript?
  22. What are setTimeout and setInterval methods in JavaScript?
  23. What is debouncing and throttling in JavaScript?
  24. What is event bubbling in JavaScript?
  25. What are the different scopes in JavaScript?
  26. What is Scope Chain in JavaScript?
  27. What are function prototypes in JavaScript?
  28. What are call(), apply() and bind() methods in JavaScript?
  29. How do you create a polyfill for the bind() function?
  30. What is HTML DOM?
  31. What is the difference between window and document in JavaScript?
  32. What is Event Loop in JavaScript?
  33. What is Callback Queue in JavaScript?
  34. What is Type Coercion in JavaScript?
  35. What is Currying in JavaScript?
  36. What is the difference between 'async' and 'defer' attributes?
  37. What is Temporal Dead Zone in JavaScript?
  38. What is Object Flattening in JavaScript?
  39. What are iterators and generators in JavaScript?
  40. What is Prototypal Inheritance (prototype chain) in JavaScript?