Mixins

BeepMixin := mixin
{
    beep := func ()
    {
        print ('beep')
    }
}

Person := class (firstName,lastName)
{
    BeepMixin()
    sayHello := func ()
    {
        print ('Hello {0} {1}',firstName,lastName)
    }
}

john := Person('John','Doe');
john.beep();