rust tdd: src/lib.rs

lib.rs

// src/lib.rs

pub fn alphabet_position(s: &str) -> String {
    s.chars()                             // <-- get an iterator over all chars
        .map(|x| -> u8 { x as u8 - 'a' as u8 + 1 })   // <-- substract the ascii value of 'a'
        .map(|x| -> String { x.to_string() })         // <-- convert the char to a String
        .collect::<Vec<String>>()                     // <-- collect a Vector of String
        .join(" ")                                    // <-- join the Strings by whitespace
}