Rust/src/ciphers/rot13.rs at master · cnidev/Rust

Repository navigation

pub fn rot13(text: &str) -> String {

let to_enc = text.to_uppercase();

to_enc

.chars()

.map(|c| match c {

'A'..='M' => ((c as u8) + 13) as char,

'N'..='Z' => ((c as u8) - 13) as char,

_ => c,

})

.collect()

}

#[cfg(test)]

mod test {

use super::*;

#[test]

fn test_single_letter() {

assert_eq!("N", rot13("A"));

}

#[test]

fn test_bunch_of_letters() {

assert_eq!("NOP", rot13("ABC"));

}

#[test]

fn test_non_ascii() {

assert_eq!("😀NO", rot13("😀AB"));

}

#[test]

fn test_twice() {

assert_eq!("ABCD", rot13(&rot13("ABCD")));

}