Smalltalk should be a very good source of inspiration, if you're looking for an OOP reference i believe the smalltalk folks have things to say. Being more of a

Smalltalk should be a very good source of inspiration, if you're looking for an OOP reference i believe the smalltalk folks have things to say. Being more of a lisper, I think stateless objects describe problems better suited for functionnal style and pattern matching. Relying on the type system of the implementation is a very unspecified aspect of a language. May be ok though if you know it is fast. Rubyists still have blocks and closures, bringing in a lot of functional style, almost unnoticed. The styles are complementary, finding the best one for the problem at hand is the art of program designers.