domain-modeling-made-functional rust and/or types

main.rs

// OR types
#[derive(Debug, Copy, Clone, PartialEq)]
enum AppleVariety {
    GoldenDelicious,
    GrannySmith,
    Fuji
}

#[derive(Debug, Copy, Clone, PartialEq)]
enum BananaVariety {
    Cavendish,
    GrosMichel,
    Manzano
}

#[derive(Debug, Copy, Clone, PartialEq)]
enum CherryVariety {
    Montmorency,
    Bing
}

// AND type
#[derive(Debug, Copy, Clone, PartialEq)]
struct FruitSalad {
    apple: AppleVariety,
    banana: BananaVariety,
    cherry: CherryVariety
}

#[derive(Debug, PartialEq)]
enum Snack {
    FruitSalad(FruitSalad),
    HandfulOfNuts { name: String, count: u8 }
}


fn offer_snack(snack: Snack) {
    match snack {
        Snack::FruitSalad(FruitSalad { apple: AppleVariety::GrannySmith, .. }) =>
            println!("I don't like granny smith apples"),
        Snack::FruitSalad(fs) =>
            println!("YAY fruit salad {:?}", fs),
        Snack::HandfulOfNuts { name, count } =>
            println!("Ah just {:?} {}?", count, name)
    }
}



fn main() {
    let fs = FruitSalad {
        apple: AppleVariety::GoldenDelicious,
        banana: BananaVariety::Cavendish,
        cherry: CherryVariety::Montmorency
    };

    let nuts = Snack::HandfulOfNuts { name: "almonds".to_string(), count: 20 };

    let fs_granny = FruitSalad { apple: AppleVariety::GrannySmith, .. fs };

    offer_snack(Snack::FruitSalad(fs));
    offer_snack(nuts);
    offer_snack(Snack::FruitSalad(fs_granny));

    //println!("{:?}", fs);
}