use std::ascii::AsciiExt; // for case insensitives only

fn main() {
    // only same types can be compared
    // String and String or &str and &str
    // exception: strict equality and inequality also work on &str and String
    let a: &str = "abc";
    let b: String = "Bac".to_owned();

    // Strings are coerced to &str when borrowed and needed
    if a == b { println!("The strings are equal") }
    if a != b { println!("The strings are not equal") }
    if a  > &b { println!("The first string is lexically after the second") }
    if a  < &b { println!("The first string is lexically before the second") }
    if a >= &b { println!("The first string is not lexically before the second") }
    if a <= &b { println!("The first string is not lexically after the second") }

    // case-insensitives:

    // equality
    // this avoids new allocations
    if a.eq_ignore_ascii_case(&b) { println!("Both strings are equal when ignoring case") }

    // everything else, create owned Strings, then compare as above
    let a2 = a.to_ascii_uppercase();
    let b2 = b.to_ascii_uppercase();

    // repeat checks
}