Generic enums in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a generic enum with one type parameter.

Rust

enum Option<T> {
    Some(T),
    [1],
}

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ANone

BNothing

CEmpty

DNull

Attempts:

3 left

💡 Hint

Common Mistakes

Using variant names like 'Nothing' or 'Null' which are not valid in Rust's Option enum.

The standard generic enum Option uses None as the variant representing no value.

2fill in blank

medium

Complete the code to create a generic enum with two type parameters.

Rust

enum Result<T, E> {
    Ok(T),
    [1](E),
}

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AError

BErr

CFail

DFailing

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Error' or 'Fail' which are not the correct variant names.

The standard generic enum Result uses Err as the variant for errors.

3fill in blank

hard

Fix the error in the generic enum definition by completing the missing variant name.

Rust

enum Either<L, R> {
    Left(L),
    [1](R),
}

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ASide

BWrong

COther

DRight

Attempts:

3 left

💡 Hint

Common Mistakes

Using variant names like 'Wrong' or 'Other' which are not standard.

The generic enum Either uses Left and Right variants to hold values of two types.

4fill in blank

hard

Fill both blanks to define a generic enum with two variants holding different types.

Rust

enum Pair<T, U> {
    First([1]),
    [2](U),
}

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AT

BV

CSecond

DThird

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variant names or wrong type parameters.

The enum Pair holds two types: T and U. The variants are named First and Second.

5fill in blank

hard

Fill all three blanks to define a generic enum with three variants holding different types.

Rust

enum Triple<A, B, C> {
    First([1]),
    Second([2]),
    [3](C),
}

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AA

BB

CThird

DFourth

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variant names or mismatching types.

The enum Triple has three variants: First, Second, and Third, holding types A, B, and C respectively.