OOP is about polymorphism. Classes and inheritance are not necessary, just like encapsulation or private data. In long: http://beza1e1.tuxen.de/articles/oop.htm

OOP is about polymorphism. Classes and inheritance are not necessary, just like encapsulation or private data. In long: http://beza1e1.tuxen.de/articles/oop.html http://beza1e1.tuxen.de/articles/oop.html The question is not where the type syntactically is. The question is, if the dispatching between functions/methods happens dynamically or statically.