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Rubyish Perl is targeting to be fun.

At this moment, you can define object methods with “def” in your class. Here we define a Cat class that’s a subclass of Animal. While
all animal can speak according to their sound.

class Animal {

    attr_accessor "sound", "name", "weight"; # rubyish accessor builder

    def speak {
        print "A " . $self->class . " goes " . $self->sound
    };

}


class Cat {
    use base 'Animal'; # Still perlish Inheritance

    def sound { "meow, meow" };

    def hello($person) { # rubyish function prototype
        "hello, $person, I am " . $self->name . "."; # auto-injected $self 
    };

}

$oreo = Cat->new->name("oreo");
$oreo->speak; #=> A Cat goes meow, meow
$oreo->hello("shelling"); #=> hello, shelling. I am oreo.

As you can see, a variable $self is injected in to the body of methods.