Defining traits in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a trait named `Speak`.

Rust

trait [1] {
    fn speak(&self);
}

Drag options to blanks, or click blank then click option'

ASpeak

BTalk

CSay

DVoice

Attempts:

3 left

💡 Hint

Common Mistakes

Using a struct name instead of a trait name.

Forgetting to use the trait keyword.

The trait is named Speak as required.

2fill in blank

medium

Complete the code to implement the `Speak` trait for struct `Dog`.

Rust

struct Dog;

impl [1] for Dog {
    fn speak(&self) {
        println!("Woof!");
    }
}

Drag options to blanks, or click blank then click option'

AAnimal

BSound

CSpeak

DTalk

Attempts:

3 left

💡 Hint

Common Mistakes

Using the struct name instead of the trait name in the impl block.

Forgetting the for keyword.

We implement the Speak trait for the Dog struct.

3fill in blank

hard

Fix the error in the trait method signature to make it a default method.

Rust

trait Speak {
    fn speak(&self) [1] {
        println!("Hello!");
    }
}

Drag options to blanks, or click blank then click option'

A{}

B-> ()

Cdefault

D;

Attempts:

3 left

💡 Hint

Common Mistakes

Ending the method signature with a semicolon when providing a default implementation.

Using the keyword default which is not valid here.

Default method implementations use curly braces {} instead of a semicolon.

4fill in blank

hard

Fill both blanks to define a trait with a method that returns a string slice.

Rust

trait [1] {
    fn name(&self) -> [2];
}

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ANamed

B&str

CString

Dstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using String instead of &str for the return type.

Forgetting the reference symbol & in the return type.

The trait is named Named and the method returns a string slice &str.

5fill in blank

hard

Fill all three blanks to implement the `Named` trait for struct `Person`.

Rust

struct Person {
    name: String,
}

impl [1] for Person {
    fn name(&self) -> [2] {
        &self.[3]
    }
}

Drag options to blanks, or click blank then click option'

ANamed

B&str

Cname

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Returning String instead of &str.

Using the wrong field name or forgetting the reference symbol.

We implement the Named trait for Person. The method returns a string slice &str referencing the name field.