Rust Intermediate Quiz 1
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Quiz 1
1. What is the primary purpose of 'lifetimes' in Rust?
To track how long a program runs
To ensure references do not outlive the data they point to
To manage the CPU usage of a thread
2. Which smart pointer is used to allocate a value on the heap?
Box<T>
Rc<T>
RefCell<T>
3. When should you use 'Rc<T>'?
For multi-threaded data sharing
To make a value mutable
For multiple ownership in single-threaded scenarios
4. What pattern does 'RefCell<T>' implement?
Thread-safe borrowing
Interior mutability
Static dispatch
5. What does the 'move' keyword do when used with a closure?
Forces the closure to take ownership of captured variables
Makes the closure run on a different thread
Deletes the variables after the closure finishes
6. Which iterator method would you use to modify elements in a collection?
iter()
iter_mut()
into_iter()
7. What is a 'trait bound'?
A limit on how many traits a struct can have
A way to hide traits from other modules
A requirement that a generic type must implement a trait
8. What does it mean that Rust iterators are 'lazy'?
They don't perform computations until consumed
They are slower than for-loops
They can only be used once
9. Which smart pointer should be used for thread-safe shared ownership?
Rc<T>
Arc<T>
Box<T>
10. What is the 'orphan rule' in Rust?
You cannot have traits without a parent module
You must implement all methods of a trait
You can only implement a trait if either the trait or the type is local to your crate
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