rustvla | Rust practice challenges

Beta

Rust's Option<T> is a powerful enum type that represents a value that might or might not be present. It is often used to safely handle cases where a value could be missing or invalid.

The Option<T> enum has two variants:

Some(T) which contains a value of type T.
None which signifies the absence of a value.

Your Task

In this challenge, you will implement a function find_first_even that takes a list of integers and returns the first even number in the list wrapped in Some. If no even number is present, the function should return None.

For example:

If the input list is [1, 3, 5, 8, 10], the function should return Some(8).
If the input list is [1, 3, 5], the function should return None.

Your task is to implement the function so it correctly handles any list of integers.

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pub fn find_first_even(numbers: &[i32]) -> Option<i32> {
    // Your code here...
}

// Example usage
pub fn main() {
    let nums1 = vec![1, 3, 5, 8];
    let nums2 = vec![1, 3, 5];

    println!("{:?}", find_first_even(&nums1)); // Output: Some(8)
    println!("{:?}", find_first_even(&nums2)); // Output: None
}

pub fn find_first_even(numbers: &[i32]) -> Option<i32> {
    // Your code here...
}

// Example usage
pub fn main() {
    let nums1 = vec![1, 3, 5, 8];
    let nums2 = vec![1, 3, 5];

    println!("{:?}", find_first_even(&nums1)); // Output: Some(8)
    println!("{:?}", find_first_even(&nums2)); // Output: None
}