Build Subclasses with Superclasses

∟Build Subclasses with Superclasses

This section describes how to build subclasses with superclasses.

The $append statements inside the class definition body can be used to build subclasses with superclasses. No additional new statements needed.

In the example below, "person" is considered as a superclass; and "employee" is considered as a subclass.

$class person: {
   $instance x: {
      x.name;
	  $method x._first(name="John") {
         x.name = name;
	  }
	  $method x.changeName(name): {
	     x.name = name; 
	  }
   }
}

$class employee: {
   $instance x: {
      x.status;
	  $method x._first(name="Maria", status="Part-time") {
	     $append x $with person(name);
		 x.status = status;
	  }
	  $method x.changeStatus(status): {
	     x.status = status;
	  }
	  $method x.print(): {
	     write(x.name);
		 wirte(x.status);
	  }
   }
}

e = employee(name="Herong", status="Full-time");
e.print();