enums

An enum is destructured as:

#[derive(Drop)]
enum Color {
    // These 3 are specified solely by their name.
    Red,
    Blue,
    Green,
    // These likewise tie `u32` tuples to different names: color models.
    RGB: (u32, u32, u32),
    HSV: (u32, u32, u32),
    HSL: (u32, u32, u32),
    CMY: (u32, u32, u32),
    CMYK: (u32, u32, u32, u32),
}

fn main() {
    let color = Color::RGB((122, 17, 40));
    // TODO ^ Try different variants for `color`

    println!("What color is it?");
    // An `enum` can be destructured using a `match`.
    match color {
        Color::Red => println!("The color is Red!"),
        Color::Blue => println!("The color is Blue!"),
        Color::Green => println!("The color is Green!"),
        Color::RGB((r, g, b)) => println!("Red: {}, green: {}, and blue: {}!", r, g, b),
        Color::HSV((h, s, v)) => println!("Hue: {}, saturation: {}, value: {}!", h, s, v),
        Color::HSL((h, s, l)) => println!("Hue: {}, saturation: {}, lightness: {}!", h, s, l),
        Color::CMY((c, m, y)) => println!("Cyan: {}, magenta: {}, yellow: {}!", c, m, y),
        Color::CMYK((
            c, m, y, k,
        )) => println!("Cyan: {}, magenta: {}, yellow: {}, key (black): {}!", c, m, y, k),
        // Don't need another arm because all variants have been examined
    }
}

See also:

enum