Cursus Raku / Addendum 🆕 / Genera et machinae textuales / Obiecta et classes / Exercises / Animalia quae loquuntur

Solutio: Animalia quae loquuntur

Ecce solutio possibilis huius exercitationis.

Codex

class Animal {
    has $.name;
    method speak { '...' }
    method greet { "{$.name} says {self.speak}" }
}

class Dog is Animal { method speak { 'Woof' } }
class Cat is Animal { method speak { 'Meow' } }

for Dog.new(name => 'Rex'), Cat.new(name => 'Tom') -> $pet {
    say $pet.greet;
}

🦋 Inveni codicem fontem in archivo animal-inheritance.raku.

Exitus

Rex says Woof
Tom says Meow

Commentarii

1. greet semel in classe fundamentali definitur, sed self.speak vocat. Quia self obiectum actuale est, vocatio ad speak proprium classis subditae pervenit.

2. Haec polymorphia est: idem greet Woof pro cane et Meow pro fele producit sine ullo codice condicionali.

Navigatio cursus

← Animalia quae loquuntur   |   Expressiones regulares et grammaticae →