Test Your Knowledge of Advanced Rust Programming Features

Gensen Huang

Created 6/20/2024

77.91%

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Sources

https://ecstatic-morse.github.io/rust/book/2018-edition/ch19-01-unsafe-rust.html

https://ecstatic-morse.github.io/rust/book/2018-edition/ch19-02-advanced-lifetimes.html

https://ecstatic-morse.github.io/rust/book/2018-edition/ch19-03-advanced-traits.html

https://ecstatic-morse.github.io/rust/book/2018-edition/ch19-04-advanced-types.html

How well do you really know Rust? Put your skills to the test with this quiz on advanced Rust programming features. Can you score a perfect 20/20?

1. What keyword is used in Rust to create an interface that permits other languages to call Rust functions?

extern

unsafe

goto

no_mangle

2. In Rust, what annotation is used to prevent name mangling when making Rust functions accessible from other languages?

#static

#no_mangle

#extern

#unsafe

3. What type of Rust variable can be problematic due to ownership rules, especially when accessed by multiple threads?

struct

enum

static

const

4. Which keyword is used to switch to unsafe Rust?

unsafe

static

pub

extern

5. What is the output of using fully qualified syntax to call the baby_name function as implemented on Dog from the Animal trait?

Error

A baby dog is called a puppy

dog

None

6. What concept in Rust can be used to handle tasks like statically enforcing that values are never confused and indicating units of a value?

Unsafe traits

Static variables

Newtype pattern

Type alias

7. What are the four unsafe superpowers in Rust?

JIT compilation, raw pointers, calling unsafe functions, manual memory management

Raw pointers, calling unsafe functions, mutable static variable access, implementing unsafe traits

Static variables, borrow checker, dereferencing, memory swapping

Reference counting, lifetimes, static mutability, async/await

8. What is the core purpose of lifetime bounds on generic types in Rust?

Verifying that references in generic types won't outlive the data they're referencing

Allowing mutable access to static variables

Guaranteeing C ABI compatibility

Managing thread safety

9. What feature in Rust allows ensuring that one lifetime outlives another?

Lifetime subtyping

Lifetime bounds

Lifetime inference

Static typing

10. Which keyword in Rust is used to declare a block of code that integrates functions from another language?

extern

pub

mod

unsafe

11. How does Rust handle calling methods of the same name from different traits implemented on one type?

It allows calling without disambiguation

It throws a compile-time error

It uses fully qualified syntax to specify the trait

It silently selects one trait based on priority

12. What mechanism does Rust provide to call methods with the same name but different traits on an instance?

Dynamic dispatch

Fully qualified syntax

Trait overloading

Macro expansion

13. In the context of advanced traits in Rust, what is a supertrait?

A trait that depends on another trait's functionality

A trait that implements another trait's methods

A globally available trait

A trait exclusively for unsafe code

14. What feature allows specifying a placeholder for types in trait definitions in Rust?

Associated types

Type aliases

Lifetime bounds

Constraints

15. What term defines how to call a function at the assembly level and is used with the extern keyword?

ABI (Application Binary Interface)

FFI (Foreign Function Interface)

MQ (Memory Queue)

RSI (Rust Standard Interface)

16. Which Rust feature helps when two types in the same scope implement a trait with an associated function of the same name?

Unsafe code

Type aliases

Fully qualified syntax

Macros

17. What is a 'raw pointer' in Rust?

A pointer that guarantees safety of referenced data

A pointer type that is similar to references but can be used in unsafe code

A default pointer type in safe Rust

A type of iterator in collections

18. Which of the following is NOT one of the four unsafe superpowers in Rust?

Calling an unsafe function or method

Dereferencing a raw pointer

Implementing an unsafe trait

Dynamic dispatch

19. When using trait objects in Rust, what syntax ensures proper handling of dynamically sized types?

Placing the trait object behind a pointer such as &Trait or Box<Trait>

Using static variables

Leveraging associated types

Employing unsafe blocks

20. What is the purpose of adding the #[no_mangle] attribute to Rust functions?

To prevent lifetime issues

To avoid memory leaks

To prevent the compiler from changing the function name

To enable dynamic dispatch

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