Returns a new subclass of the receiver class. You can use this method to create a new class that is a subclass of the superclass to which you send the message. The classid is a string that identifies the subclass. (You can use the id method to retrieve this string.)

The metaclass is a class object. If you specify metaclass, the new subclass is an instance of metaclass. (A metaclass is a class that you can use to create a class, that is, a class whose instances are classes. The Class class and its subclasses are metaclasses.)

If you do not specify a metaclass, the new subclass is an instance of the default metaclass of the receiver class. For subclasses of the Object class, the default metaclass is the Class class.

The methods is a collection whose indexes are the names of methods and whose items are method objects (or strings or arrays of strings containing method code). If you specify methods, the new class is enhanced with class methods from this collection. (The metaclass of the new class is not affected.)

The metaclass method returns the metaclass of a class.

The method search order of the new subclass is the same as that of the receiver class, with the addition of the new subclass at the start of the order.

room=.object~subclass("Room")   /* Superclass is .object     */
                                /* Subclass is room          */
                                /* Subclass identity is Room */