Ejercicio: Encadenamiento de métodos del iterador
In this exercise, you will need to find and use some of the provided methods in the Iterator
trait to implement a complex calculation.
Copy the following code to https://play.rust-lang.org/ and make the tests pass. Use an iterator expression and collect
the result to construct the return value.
#![allow(unused)] fn main() { /// Calcula las diferencias entre los elementos de `values` offset por offset, /// envolviendo de esta forma los elementos desde el final de `values` hasta el principio. /// /// El elemento `n` del resultado es `values[(n+offset)%len] - values[n]`. fn offset_differences<N>(offset: usize, values: Vec<N>) -> Vec<N> where N: Copy + std::ops::Sub<Output = N>, { unimplemented!() } #[test] fn test_offset_one() { assert_eq!(offset_differences(1, vec![1, 3, 5, 7]), vec![2, 2, 2, -6]); assert_eq!(offset_differences(1, vec![1, 3, 5]), vec![2, 2, -4]); assert_eq!(offset_differences(1, vec![1, 3]), vec![2, -2]); } #[test] fn test_larger_offsets() { assert_eq!(offset_differences(2, vec![1, 3, 5, 7]), vec![4, 4, -4, -4]); assert_eq!(offset_differences(3, vec![1, 3, 5, 7]), vec![6, -2, -2, -2]); assert_eq!(offset_differences(4, vec![1, 3, 5, 7]), vec![0, 0, 0, 0]); assert_eq!(offset_differences(5, vec![1, 3, 5, 7]), vec![2, 2, 2, -6]); } #[test] fn test_custom_type() { assert_eq!( offset_differences(1, vec![1.0, 11.0, 5.0, 0.0]), vec![10.0, -6.0, -5.0, 1.0] ); } #[test] fn test_degenerate_cases() { assert_eq!(offset_differences(1, vec![0]), vec![0]); assert_eq!(offset_differences(1, vec![1]), vec![0]); let empty: Vec<i32> = vec![]; assert_eq!(offset_differences(1, empty), vec![]); } }