Questions

1. What is the difference between str and String?
2. Why can’t string slices be passed into a function (string slice meaning str as opposed to &str)?
3. How do we access the data belonging to a key in a HashMap?
4. When a function results in an error, can we handle other processes, or will the error crash the program instantly?
5. Why does Rust only allow one mutable borrow at a point in time?
6. When would we need to define two different lifetimes in a function?
7. How can structs link to the same struct via one of their fields?
8. How can we add extra functionality to a struct where the functionality can also be implemented by other structs?
9. How do we allow a container or function to accept different data structures?
10. What’s the quickest way to add a trait, such as Copy, to a struct?