Question

How to use match with a enum in Rust

Answer 1

#[allow(dead_code)]

enum Temperature {
    Celsius(i32),
    Fahrenheit(i32),
}

fn main() {
    let temperature = Temperature::Celsius(21);
    

    match temperature {
        Temperature::Celsius(t) if t > 20 => println!("{} > 25 Celsius", t),
        Temperature::Celsius(t) => println!("{} < 25 Celsius", t),

        Temperature::Fahrenheit(t) if t > 80 => println!("{} > 80 Fahrenheit", t),
        Temperature::Fahrenheit(t) => println!("{} < 80 Fahrenheit", t),
    }
}




/*
run:

21 > 25 Celsius

*/

 

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Answer 2

#[allow(dead_code)]

enum Temperature {
    Celsius(i32),
    Fahrenheit(i32),
}

fn main() {
    let temperature = Temperature::Fahrenheit(70);
    

    match temperature {
        Temperature::Celsius(t) if t > 20 => println!("{} > 25 Celsius", t),
        Temperature::Celsius(t) => println!("{} < 25 Celsius", t),

        Temperature::Fahrenheit(t) if t > 80 => println!("{} > 80 Fahrenheit", t),
        Temperature::Fahrenheit(t) => println!("{} < 80 Fahrenheit", t),
    }
}




/*
run:

70 < 80 Fahrenheit

*/

 

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