1. What is JavaScript?

2. What are JavaScript data types?

3. What is a function in JavaScript?

4. What is the DOM?

5. What are JavaScript arrays?

6. What is an object in JavaScript?

7. What is a callback function?

8. What is the difference between let, const, and var?

9. What is the purpose of the 'this' keyword?

10. What are promises in JavaScript?

11. What is the difference between == and ===?

12. What is event bubbling?

13. What is hoisting?

14. What is the difference between synchronous and asynchronous programming?

15. What is closure?

41. How does a basic 'for' loop work in JavaScript?

42. How does 'forEach' work in JavaScript?

43. How do you use 'for...of' in JavaScript?

44. How do you use 'for...in' in JavaScript?

45. How does 'if-else' work in JavaScript?

46. How does 'switch' work in JavaScript?

16. What is the spread operator?

17. What are template literals?

18. What is a module in JavaScript?

19. What is an IIFE?

20. What is the difference between Object.freeze() and Object.seal()?

21. What is the event delegation?

22. What is JSON?

23. What are arrow functions?

24. What is the purpose of the 'bind' method?

25. What is the difference between shallow copy and deep copy?

26. What is local storage?

27. What is the fetch API?

28. What is the purpose of setTimeout()?

29. What is 'strict mode'?

30. What is the difference between function expressions and function declarations?

31. What is the 'finally' block in promises?

32. What is the 'map' method?

33. What is the 'reduce' method?

34. What are higher-order functions?

35. What is a generator function?

36. What is the 'instanceof' operator?

37. What is the purpose of 'setInterval()'?

38. What is the difference between call() and apply()?

39. What is a Promise.all()?

40. What is the 'slice()' method?

41. What is the 'for...of' loop?

42. What are template literals?

43. What is the spread operator?

44. What is the 'reduceRight()' method?

45. What is a self-invoking function?

46. What is the 'includes()' method?

47. What is method chaining?

48. What is the 'every()' method?

49. What is the 'some()' method?

50. What are IIFEs (Immediately Invoked Function Expressions)?

51. What is 'Object.assign()'?

52. What is the 'bind()' method?

53. What is 'window.onload'?

54. What is the 'map()' method?

55. What is the 'filter()' method?

56. What is 'localStorage'?

57. What is the 'sessionStorage'?

58. What is 'null' in JavaScript?

59. What is the 'typeof' operator?

60. What is the 'concat()' method?

61. What are 'async' functions?

62. What is the 'try...catch' statement?

63. What is the 'Math.random()' method?

64. What is the 'setTimeout()' function?

65. What is the 'setInterval()' function?