Interfaces

Interace is an abstration that defines what a class can do without specifying how to do it. It consists of a set of a abstract methods.

The following example defines an interface that serves as a contract for any entity requring authentication.

interface Authenticatable {

    // Validate the provided credential
    fn login(password: string) -> bool

}

To implement an interface use the : Interface syntax in class declaration:

class User(
    var name: string,
    priv var passwordHash: string
) : Authenticatable {

    fn login(password: string) -> bool {
        return secureHash(password) == password
    }

}