30+ JavaScript Interview Questions

JavaScript Interview Questions:

1. What is Ecmascript in Javascript
2. What is difference between let ,cons and var
3. What is spread operator, Rest operator, default parameter
4. What is deep copy and shallow copy in Javascript
5. What is promise , callback function , async await in Javascript
6. What is difference between promise and callback in Javascript
7. What is event bubbling and event capturing in Javascript
8. What is higher order function in Javascript
9. Explain different-2 types of function in Javascript
10. What is arrow function in Javascript
11. Why we use call, apply bind method in Javascript
12. How many way to create object in Javascript
13. What is prototype inheritance in Javascript
14. What is typescript
15. What are the array method , string method
16. What is difference between java and javascript
17. What is throttling and debouncing in js
18. What is Null and undefined in javascript
19. What are the falsy values in javascript
20. What is execution context, event loop ,stack, call queue,microtask queue in Javascript
21. What is setTimeOut and setInterval in Javascript
22. What is object.seal and object.freeze in Javascript
23. What is difference between map and set in Javascript
24. What is Weakmap and Weakset in Javascript
25. What is sessionStorage, localStorage , cookie in javascript
26. Write a program to sort an array
27. What is use of json.stringify and json parse() method in Javascript
28. What are is map, filter , reducer in javascript
29. What is generator function in Javascript
30. How to stop event propagation in Javascript
31. What is closure in Javascript
32. What is housing in Javascript
33. What is dead zone in Javascript
34. What is function currying in Javascript
35. What is mutation observer in Javascript
36. What is memorization in javascript

 

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