Function process

src/bin/error_option_unwrap_map.rs:37–41

A function to peel, chop, and cook food all in sequence. We chain multiple uses of `map()` to simplify the code.

(food: Option<Food>)

// A function to peel, chop, and cook food all in sequence.
// We chain multiple uses of `map()` to simplify the code.
fn process(food: Option<Food>) -> Option<Cooked> {
    food.map(|f| Peeled(f))
        .map(|Peeled(f)| Chopped(f))
        .map(|Chopped(f)| Cooked(f))
}

// Check whether there's food or not before trying to eat it!
fn eat(food: Option<Cooked>) {