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JavaScript Questions And Answers For Freshers In 2023

Questions :
1. What is JavaScript ?
2. What is the difference between null and undefined ?
3. Explain the concept of closures in JavaScript. ?
4. What is the purpose of the bind method ?
5. What is event delegation ?
6. Explain hoisting in JavaScript.?
7. How does JavaScript handle asynchronous programming ?
8. What is the this keyword in JavaScript ?
9. Explain the same-origin policy and CORS in JavaScript.?
10. What are arrow functions ?
11. How do you handle errors in JavaScript ?
12. Explain the concept of prototype inheritance. ?
13. What is a callback function ?
14. How does the event loop work in JavaScript ?
15. What are the differences between let, const and var ?
16. How do you clone an object in JavaScript ?
17. What is the purpose of the localStorage and sessionStorage objects ?
18. How can you check the data type of a variable ?
19. What is the purpose of the map function in javascript ?
20. How can you prevent the default behavior of an event ?

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