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.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:
[1, 3, 5, 8, 10]
, the function should return Some(8)
.[1, 3, 5]
, the function should return None
.Your task is to implement the function so it correctly handles any list of integers.
pub fn find_first_even(numbers: &[i32]) -> Option<i32> { // Your code here... numbers.iter().find(|x| *x % 2 == 0).copied()}// Example usagepub 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... numbers.iter().find(|x| *x % 2 == 0).copied()}// Example usagepub 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> { numbers.iter().find(|&i| i%2==0).copied()}// Example usagepub 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> { numbers.iter().find(|&i| i % 2 == 0).copied()}// Example usagepub 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> { numbers.iter().find(|&n| n%2==0).copied()}// Example usagepub 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> { for number in numbers.iter(){ if number % 2 == 0 { return Some(*number) } } None}// Example usagepub 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... for num in numbers { if *num % 2 == 0 { return Some(*num); } } None}// Example usagepub 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> { numbers.iter().find(|&n| n % 2 == 0).copied()}// Example usagepub 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... for i in numbers { if *i % 2 == 0 { return Some(*i); } } None}// Example usagepub 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... for i in numbers { if i%2 == 0 { return Some(*i); } } None}// Example usagepub 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... numbers.iter().find(|&&x| x % 2 == 0).cloned()}// Example usagepub 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> { for &num in numbers.iter() { if num % 2 == 0 { return Some(num); } } None}// Example usagepub 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.... for &num in numbers.iter() { if num % 2 == 0 { return Some(num); } } None}// Example usagepub 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... for number in numbers.iter(){ if number%2 == 0{ return Some(*number) } } return None}// Example usagepub 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... numbers.iter().find(|num| *num % 2 == 0).copied()}// Example usagespub 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... numbers.iter().find(|number| *number % 2 == 0).copied()}// Example usagepub 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> { for &n in numbers { if n % 2 == 0 { return Some(n); } } return None;}// Example usagepub 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> { numbers.iter().find(|&x| x % 2 == 0).copied()}// Example usagepub 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... for n in numbers { if n % 2 == 0 { return Some(*n) } } return None}// Example usagepub 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> { for &i in numbers { if i % 2 == 0 { return Some(i); } } None}// Example usagepub 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... numbers.iter().find(|number| *number % 2 == 0).cloned()}// Example usagepub 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> { for number in numbers { if number % 2 == 0 { return Some(*number); } } None}// Example usagepub 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> { for n in numbers { if n % 2 == 0 { return Some(*n); } } None}// Example usagepub 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... let mut rez = None; for el in numbers{ if el%2 == 0 { rez = Some(el).copied(); break; } }; rez}// Example usagepub 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... let mut rez = None; for el in numbers{ if el%2 == 0 { rez = Some(el).copied(); break; } }; rez}// Example usagepub 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> {// for &number in numbers{// if number % 2 == 0{// return Some(number);// }// }// return None;// }pub fn find_first_even(numbers: &[i32]) -> Option<i32> { for number in numbers{ if number % 2 == 0{ return Some(*number); } } return None;}// Example usagepub 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> { for &num in numbers { if num % 2 == 0 { return Some(num); } } None}// Example usagepub 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> { for &number in numbers.iter() { if number % 2 == 0 { return Some(number); } } None}// Example usagepub 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> { for num in numbers { if num % 2 == 0 { return Some(*num); } } None}// Example usagepub 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> { numbers.iter().find(|&&n| n % 2 == 0).copied()}// Example usagepub 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... numbers.iter().find(|&&x| x % 2 == 0).copied()}// Example usagepub 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> { for n in numbers { if n % 2 == 0 {return Some(*n);} } return None;}// Example usagepub 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> { let n_iter = numbers.iter(); for n in n_iter { if n % 2 == 0 {return Some(*n);} } return None;}// Example usagepub 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... numbers.iter().find(|i| *i % 2 == 0).map(|i| *i)}// Example usagepub 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... for element in numbers.iter() { if element % 2 == 0 { return Some(*element); } } None}// Example usagepub 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> { for num in numbers { if num % 2 == 0 { return Some(*num); } } return None;}// Example usagepub 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... for num in numbers { if num % 2 == 0 { return Some(*num) } } return None}// Example usagepub 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... for n in numbers.iter() { if n % 2 == 0 { return Some(*n) } } return None}// Example usagepub 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> { numbers.iter().find(|&&n| n % 2 == 0).copied()}// Example usagepub 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> { for number in numbers { if number % 2 == 0 { return Some(*number) } } return None}// Example usagepub 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... for number in numbers { if number % 2 == 0 { return Some(*number); } } None}// Example usagepub 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... for number in numbers { if number & 1 != 1 { return Some(*number); } } return None;}// Example usagepub 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... for number in numbers { if number & 1 != 1 { return Some(*number); } } return None;}// Example usagepub 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> { for number in numbers { if number % 2 == 0 { return Some(*number)}; } return None;}// Example usagepub 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> { for number in numbers { match number { num if num % 2 == 0 => return Some(num.clone()), _ => None::<i32>, }; } return None;}// Example usagepub 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> { for num in numbers { if num % 2 == 0 { return Some(*num) } } None}// Example usagepub 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... numbers.iter().find(|x| *x%2==0).copied()}// Example usagepub 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... for &i in numbers { if i % 2 == 0 { return Some(i) } } None}// Example usagepub 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... for num in numbers.iter() { if num % 2 == 0 { return Some(*num) } } None}// Example usagepub 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> { if let Some(number) = numbers.iter().filter(|number| *number % 2 == 0).next() { return Some(*number) } None}// Example usagepub 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}