Question

How to reverse the case of each character in a string with Rust

Answer 1

fn reverse_case(s: &str) -> String {
    s.chars()
        .map(|ch| {
            if ch.is_lowercase() {
                ch.to_uppercase().to_string()
            } else if ch.is_uppercase() {
                ch.to_lowercase().to_string()
            } else {
                ch.to_string()
            }
        })
        .collect()
}

fn main() {
    let s = "ABC++xyz";
    
    let output = reverse_case(s);
    
    println!("{}", output); 
}



      
/*
run:
  
abc++XYZ

*/

 

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