Enum

^Syntax
Enumeration :
   enum IDENTIFIER {
      EnumField^*
      EnumMethod^*
   }

EnumField :
   IDENTIFIER | IDENTIFIER(TupleElements^?)

EnumMethod :
   Function

TupleElements :
   Type ( , Type )^*

An enum, also referred to as enumeration is a simultaneous definition of a nominal Enum type, that can be used to create or pattern-match values of the corresponding type.

Enumerations are declared with the keyword enum.

An example of an enum item and its use:

enum Animal {
    Dog
    Cat
    Bird(BirdType)
    
    pub fn bark(self) -> String<10> {
        match self {
            Animal::Dog => {
                return "bow"
            }

            Animal::Cat => {
                return "meow"
            }
            
            Animal::Bird(BirdType::Duck) => {
                return "quack"
            }
            
            Animal::Bird(BirdType::Owl) => {
                return "hoot"
            }
        }
    }
}

enum BirdType {
    Duck
    Owl
}

fn f() {
    let barker: Animal = Animal::Dog
    barker.bark()
}