Rust Programming Language MCQ Test 2

1. Which trait in Rust allows implementing the 'index' operator for custom types?

2. In Rust, what is the purpose of the 'unsafe' keyword?

3. What is the primary purpose of the 'enum' keyword in Rust?

4. What is the ownership system designed to achieve in Rust?

5. How do you include an external crate in a Rust project?

6. What is the primary purpose of the 'Drop' trait in Rust?

7. Explain the role of 'match' in Rust and how it facilitates pattern matching beyond simple value checking.

8. What is the purpose of the 'Deref' trait in Rust?

9. What is the syntax for commenting a single line in Rust?

10. Discuss Rust's philosophy of 'Fearless Concurrency' and how its language features contribute to achieving this.

11. In Rust, how do you handle a potential panic situation?

12. In Rust, what does the 'derive' attribute do?

13. How does Rust achieve zero-cost abstractions and what is the significance of the ownership model in this context?

14. In Rust, how do you print to the standard output?

15. In Rust, how do you create an immutable reference to a variable?

16. Which Rust keyword is used to implement a trait for a type?

17. Examine Rust's trait system and its role in achieving code reusability.

18. In Rust, what is the purpose of the 'match' keyword?

19. Which Rust trait is used for defining custom string representations of objects?

20. In Rust, what does the 'Option' type represent?

21. How is error handling typically done in Rust?

22. Discuss the concept of lifetimes in the context of mutable references and how Rust ensures safety.

23. Explain the role of the 'unsafe' keyword in Rust and scenarios where its use is justified.

24. In Rust, how do you declare and instantiate a new struct?

25. Which keyword is used to bring a module into scope in Rust?

26. Which data type is used for integers in Rust?

27. Elaborate on Rust's concept of lifetimes and how it avoids dangling references.

28. Which Rust data type is used for boolean values?

29. What is the significance of Rust's 'Cargo' tool in managing dependencies and building projects?

30. Explain the concept of lifetimes in Rust and their role in the borrow checker.

31. In Rust, how do you define a constant?

32. What is the purpose of the 'Cow' type in Rust?

33. Which Rust macro is used for creating a 'match' expression?

34. Which Rust attribute is used to disable the 'dead code' lint warning?

35. Discuss the role of lifetimes in the context of function return values and their impact on variable scopes.

36. What are Rust macros, and how do they differ from functions?

37. What are Rust's unsafe blocks, and in what scenarios are they used?

38. Which Rust keyword is used to create a new instance of a struct?

39. What is the purpose of the 'as' keyword in Rust?

40. What is the file extension for Rust source code files?