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In this article I'm sharing some most and commonly asked javascript interview questions. And in my opinion if you can answers these questions that means you already know JavaScript well!!!.

QUESTIONS:

1. What is JavaScript?

1. Enumerate the differences between Java and JavaScript?

1. What are JavaScript Data Types?

1. What is the use of isNaN function?

1. Between JavaScript and an ASP script, which is faster?

1. What is negative infinity?

1. Is it possible to break JavaScript Code into several lines?

1. Which company developed JavaScript?

2. What are undeclared and undefined variables?

3. Write the code for adding new elements dynamically?

4. What are global variables? How are these variable declared and what are the problems associated with using them?

5. What is a prompt box?

6. What is 'this' keyword in JavaScript?

7. Explain the working of timers in JavaScript? Also elucidate the drawbacks of using the timer,if any?

8. Which symbol is used for comments in Javascript?

9. What is the difference between ViewState and SessionState?

10. Explain what is pop()method in JavaScript?

11. Whether JavaScript has concept level scope?

12. Mention what is the disadvantage of using innerHTML in JavaScript?

13. What is break and continue statements?

14. What are the two basic groups of dataypes in JavaScript?

15. What are all the types of Pop up boxes available in JavaScript?

16. What is the use of Void(0)?

17. How can a page be forced to load another page in JavaScript?

18. What is the data type of variables of in JavaScript?

19. What is the difference between an alert box and a confirmation box?

20. What are escape characters?

21. What are JavaScript Cookies?

22. How can you convert the string of any base to integer in JavaScript?

23. Explain the difference between "==" and "==="?

24. What would be the result of 3+2+"7"?

25. Explain how to detect the operating system on the client machine?

26. What is the function of delete operator?

27. What is an undefined value in JavaScript?

28. What is === operator?

29. Explain how can you submit a form using JavaScript?

30. Does JavaScript support automatic type conversion?

31. How can the style/class of an element be changed?

32. Explain how to read and write a file using JavaScript?

33. What are all the looping structures in JavaScript?

34. What is called Variable typing in Javascript?

35. What is the use of window object?

36. What are the different data types present in JavaScript?

37. What is the difference between undefined value and null value?

38. What are classes in ES6?

39. What is this [[[ ]]] ?

40. What are the differences between cookie, local storage and session storage ?

41. What is the difference between setInterval and setTimeout?

42. What are promises?

43. Explain closures.

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