Most Asked Javascript Interview Questions

Most Asked Javascript Interview Questions

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2 min read

  1. What is a JavaScript?
  2. What is the original name of JavaScript?
  3. Where can we use JS?
  4. What differentiates JS from other languages like Java?
  5. What are the advantages and disadvantages of JS?
  6. Why do we need JS Frameworks?
  7. What ECMAScript stands for?
  8. What paradigms exist in JS?
  9. What is Scope in JS?
  10. Explain Hoisting in JS.
  11. What is a strict mode?
  12. What are the two basic groups of data types in JS?
  13. Name all data types in JS.
  14. What are falsy values in JS?
  15. What is Memoization?
  16. What is closure?
  17. What operators exist in JS?
  18. Explain “this” keyword.
  19. What are global variables?
  20. Explain the difference between ES5 and ES6.
  21. What is the difference between var, let, and const?
  22. What are the escape characters in JS?
  23. What is the difference between Function Declarations and Function Expressions?
  24. What is the Arrow Function?
  25. What is the Self-Executing Function?
  26. What is Higher-Order Function?
  27. What are Function Default Parameters?
  28. What is the NaN property?
  29. Explain the difference between “==” and “===” operators.
  30. Explain callbacks.
  31. What are Promises?
  32. What is Async/Await?
  33. Explain Prototype Inheritance.
  34. What is a Polyfill?
  35. Explain call(), apply(), and bind() methods.
  36. What are the different types of errors in JS?
  37. What is DOM?
  38. What is Event Bubbling?
  39. What is Event Propagation?
  40. What is Event Capturing?
  41. What is the use of the Math object?
  42. What are Template Literals?
  43. What "new" keyword stands for?
  44. What is Object and Array Destructuring?
  45. Explain the same-origin policy in JS.
  46. How to write a comment in JS?
  47. What are Cookies in JS?
  48. What is Local Storage in Browser?
  49. What is the difference between Local Storage and Session Storage in Browser?
  50. Is getting Local Storage content asynchronous or synchronous action?

Credits - Twitter Thread - Eugene Zolotarenko

More Reading -

  1. GitHub - sudheerj
  2. InterviewBit
  3. Edureka
  4. Hackr.io
  5. Toptal
  6. Simplilearn
  7. GFG-S1
  8. UpGrad
  9. CodeMentor
  10. TP