JavaScript questions:

  1. What is JavaScript?
  2. How do you declare a variable in JavaScript?
  3. What are the different data types present in JavaScript?
  4. What is the difference between == and === in JavaScript?
  5. Explain the concept of hoisting in JavaScript.
  6. What are JavaScript closures? Give an example.
  7. How do you create a function in JavaScript?
  8. What are the different ways to create an object in JavaScript?
  9. Explain the prototype chain in JavaScript.
  10. What is event bubbling in JavaScript?
  11. How does the this keyword work in JavaScript?
  12. What are arrow functions, and how do they differ from regular functions?
  13. What are promises, and how do they work?
  14. Explain async/await in JavaScript.
  15. What is the Document Object Model (DOM)?
  16. How do you select elements in the DOM?
  17. What are template literals in JavaScript?
  18. How do you handle exceptions in JavaScript?
  19. What is the spread operator, and where can you use it?