1. What is Swift?

2. What is a variable in Swift?

3. Explain if-else statement in Swift.

4. What is a loop in Swift?

5. What is an array in Swift?

6. What is a dictionary in Swift?

7. Explain the for-in loop syntax.

8. How to define a function in Swift?

9. Explain the while loop.

10. What is a class in Swift?

11. Explain inheritance in Swift.

12. What is a protocol in Swift?

13. Explain optional in Swift.

14. What is a closure in Swift?

15. Explain enumerations in Swift.

16. What is a struct in Swift?

17. Explain the guard statement.

18. What are computed properties?

19. Explain lazy properties in Swift.

20. What is type casting?

21. Explain encapsulation.

22. What is a tuple in Swift?

23. Explain generics in Swift.

24. What are extensions?

25. Explain map, filter, and reduce functions.

26. What is a switch statement?

27. Explain higher-order functions.

28. What is ARC (Automatic Reference Counting)?

29. Explain weak and unowned references.

30. What are subscripts?

31. What is a dispatch queue?

31. What is optional chaining in Swift?

32. What is a singleton pattern?

33. Explain `defer` in Swift.

34. What is a custom initializer?

35. Explain error handling in Swift.

36. What are type aliases in Swift?

37. Explain property observers in Swift.

38. What is a higher-order function in Swift?

39. Explain Codable in Swift.

40. What is multithreading with GCD?