Rust Generic Quiz

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40 comprehensive questions on Rust's generic programming system, covering generic functions, structs, enums, impl blocks, and monomorphization — with 11 code examples demonstrating practical generic usage patterns.

40 Questions

~80 minutes

Question 1

What are generics in Rust?

A way to write code that works with multiple types while maintaining type safety

A way to create generic containers

A way to avoid type checking

A way to create dynamic types

Question 2

How do you define a generic function?

fn function_name<T>(param: T) -> T { ... }

fn function_name(param: Generic) -> Generic { ... }

fn function_name(param: T) -> T { ... }

Generic functions cannot be defined

Question 3

What will this generic function do?

rust

fn largest<T>(list: &[T]) -> &T {
    let mut largest = &list[0];
    for item in list {
        if item > largest {
            largest = item;
        }
    }
    largest
}

fn main() {
    let numbers = vec![34, 50, 25, 100, 65];
    let result = largest(&numbers);
    println!("The largest number is {}", result);
}

Prints 'The largest number is 100'

Compilation error because T doesn't implement comparison

Prints 'The largest number is 34'

Runtime error

Question 4

How do you add trait bounds to generic functions?

fn function<T: Trait>(param: T) or fn function<T>(param: T) where T: Trait

fn function(param: T) requires Trait

Trait bounds cannot be added to functions

Use implements keyword

Question 5

What is monomorphization?

The process where the compiler creates specific versions of generic code for each concrete type used

The process of making code polymorphic

The process of optimizing generic code

The process of erasing type information

Question 6

What are the benefits of monomorphization?

Zero runtime cost, static dispatch, optimal performance

Smaller binary size

Dynamic type checking

Runtime polymorphism

Question 7

How do you define a generic struct?

struct StructName<T> { field: T }

struct StructName { field: Generic }

struct StructName<T> { field: Generic }

Generic structs cannot be defined

Question 8

What will this generic struct instantiation create?

rust

struct Point<T> {
    x: T,
    y: T,
}

fn main() {
    let integer_point = Point { x: 5, y: 10 };
    let float_point = Point { x: 1.0, y: 4.0 };
}

Two Point instances with different concrete types

Compilation error

One Point instance

Runtime error

Question 9

How do you implement methods for generic structs?

impl<T> StructName<T> { fn method(&self) { ... } }

impl StructName { fn method(&self) { ... } }

impl StructName<T> { fn method(&self) { ... } }

Methods cannot be implemented for generic structs

Question 10

What will this generic method implementation do?

rust

struct Point<T> {
    x: T,
    y: T,
}

impl<T> Point<T> {
    fn x(&self) -> &T {
        &self.x
    }
}

fn main() {
    let p = Point { x: 5, y: 10 };
    println!("p.x = {}", p.x());
}

Prints 'p.x = 5'

Compilation error

Prints 'p.x = 10'

Runtime error

Question 11

How do you implement methods only for specific types in generic structs?

Use concrete type in impl block: impl Point<f32> { ... }

Add type constraints to the struct

Use where clauses

This is not possible

Question 12

What are generic enums?

Enums that can hold different types of data in their variants

Enums with type parameters

Both A and B

Enums that cannot be generic

Question 13

How is Option<T> defined?

enum Option<T> { Some(T), None }

enum Option { Some(T), None }

struct Option<T> { value: T }

Option is not generic

Question 14

How is Result<T, E> defined?

enum Result<T, E> { Ok(T), Err(E) }

enum Result<T> { Ok(T), Err(E) }

struct Result<T, E> { ok: T, err: E }

Result is not generic

Question 15

What is the difference between Option<T> and Result<T, E>?

Option represents optional values, Result represents operations that can fail

Option has two variants, Result has one

Result is simpler than Option

There is no difference

Question 16

How do you use multiple generic type parameters?

fn function<T, U>(param1: T, param2: U)

fn function<T U>(param1: T, param2: U)

fn function(param1: T, param2: U)

Multiple parameters are not allowed

Question 17

What are const generics?

Generic parameters that are constant values known at compile time

Generic parameters that are constant at runtime

Generic parameters for constants

Const generics don't exist

Question 18

How do you define a const generic parameter?

fn function<const N: usize>(arr: [i32; N])

fn function<N: usize>(arr: [i32; N])

fn function(arr: [i32; N])

Const generics are not supported

Question 19

What is the where clause used for?

Specifying complex trait bounds that are clearer than inline bounds

Defining where functions are implemented

Specifying where generics can be used

Where clauses are not used in Rust

Question 20

What will this where clause example do?

rust

fn some_function<T, U>(t: T, u: U) -> i32
    where T: Display + Clone,
          U: Clone + Debug
{
    // function body
}

Requires T to implement Display and Clone, U to implement Clone and Debug

Compilation error

Requires T and U to implement the same traits

Runtime error

Question 21

What is generic lifetime in relation to generics?

Lifetime parameters can be generic just like type parameters

Generic lifetimes don't exist

Lifetimes are not generic

Generic lifetimes are the same as type generics

Question 22

How do you declare generic lifetimes?

fn function<'a, T>(param: &'a T)

fn function<T, 'a>(param: &'a T)

fn function(param: &'a T)

Generic lifetimes cannot be declared

Question 23

What is the relationship between generics and performance?

Generics provide zero-cost abstractions through monomorphization

Generics have runtime overhead

Generics are slower than concrete types

Generics increase binary size significantly

Question 24

What happens to binary size with generics?

May increase due to monomorphization creating multiple versions

Always decreases

Remains the same

Dramatically increases

Question 25

How do you create a generic type alias?

type Result<T> = std::result::Result<T, std::io::Error>;

alias Result<T> = std::result::Result<T, std::io::Error>;

typedef Result<T> = std::result::Result<T, std::io::Error>;

Generic type aliases are not supported

Question 26

What is generic associated type?

An associated type that is itself generic

A type associated with generics

Generic types in associated positions

Generic associated types don't exist

Question 27

How do you define a generic associated type?

trait Trait { type Associated<T>; }

trait Trait { type Associated: Generic; }

trait Trait { generic type Associated; }

Generic associated types are not supported

Question 28

What is higher-kinded types in relation to generics?

Types that take other types as parameters, like Vec<T> taking T

Types that are higher-order

Types that cannot be generic

Higher-kinded types are not supported in Rust

Question 29

What is the turbofish operator (::<>)?

Explicit type annotation syntax for generic function calls

Operator for fast operations

Operator for type casting

The turbofish operator doesn't exist

Question 30

When would you use the turbofish operator?

When the compiler cannot infer the generic type parameters

For all generic function calls

To improve performance

Turbofish is never needed

Question 31

What will this turbofish example do?

rust

let numbers: Vec<i32> = vec![];
let result = numbers.into_iter().collect::<Vec<_>>();

Explicitly specifies Vec<_> as the collect target type

Compilation error

Uses default collection type

Runtime error

Question 32

What is generic covariance and contravariance?

How generic types relate to their type parameters' subtyping relationships

How generics vary in performance

How generics handle variance

Variance is not relevant to generics

Question 33

What is phantom data in generic contexts?

Zero-sized type parameters used to enforce type safety or carry metadata

Data that is invisible at runtime

Data that is not generic

Phantom data doesn't exist

Question 34

How do you use PhantomData?

struct MyStruct<T> { data: PhantomData<T> }

struct MyStruct { phantom: T }

struct MyStruct<T> { phantom: PhantomData }

PhantomData is not used in structs

Question 35

What is generic specialization?

Providing specific implementations for certain generic types

Making generics more specific

Specializing generic code for performance

Generic specialization is not supported

Question 36

What are the limitations of generics in Rust?

Cannot perform dynamic dispatch, monomorphization can increase binary size

Cannot use with all types

Cannot be nested deeply

Generics have no limitations

Question 37

How do generics interact with trait objects?

Generics use static dispatch, trait objects use dynamic dispatch

They cannot be used together

Generics replace trait objects

Trait objects replace generics

Question 38

What is generic inference?

The compiler's ability to automatically determine generic type parameters

Manual specification of generic types

Runtime type determination

Generic inference doesn't exist

Question 39

When does generic inference fail?

When there are multiple valid interpretations or insufficient context

When types are complex

When using turbofish

Inference never fails

Question 40

In a scenario where you're building a generic data structure that needs to work with any comparable type, how would you design the generic constraints?

Use trait bounds like <T: Ord> to ensure types can be compared and ordered

Use runtime type checking

Avoid generics and use concrete types

Use trait objects for all operations

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Master Rust's file system operations and I/O handling for robust data persistence and streaming

Smart Pointers

Master Rust's smart pointer types for automatic memory management and safe heap allocation

Concurrency

Master Rust's concurrency model with threads, channels, and synchronization primitives for safe parallel programming

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Master asynchronous programming in Rust with futures, async/await, and concurrent execution patterns

Memory Management

Deep dive into Rust's ownership system, borrowing rules, and advanced memory management patterns for safe and efficient code

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Rust Generic Quiz

Question 1

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Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40

About This Generics Quiz

What You Will Practise

Other Quiz Categories

QUIZZES IN Rust

Cargo and Project Setup

Variables and Mutability

Data Types

Control Flow

Functions

Ownership

Borrowing

Lifetimes

Strings

Collections

Slices

Pattern Matching

Enums

Struct

Modules

Traits

Generic

Iterators

Closures

Error Handling

File and I/O Operations

Smart Pointers

Concurrency

Async Programming

Memory Management

Macros

Attributes

Testing

Crate Architecture

Performance and Optimization