class Dog {
    has Str $.name;

    method bark(Int:D $x) {
        say self.^name;   # self is an implicit variable that refers to the invocant
        say "bark" for 1..$x;       
    }
}

my $d = Dog.new(name => "Rover");
$d.bark(3);

---output:--
Dog
bark
bark
bark