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Comment by alankay1 | Hacker News Reader

I liked Self. "Good OOP" is still waiting for a much better notion to replace the idea of a "Class"

Trygve Reenskaug (MVC inventer ) and Jim Coplien (Patterns/Hillside) developed the DCI paradigm as a way model code around the roles played by objects, rather than the concrete type (class) of each object.

video: https://www.infoq.com/presentations/Reflection-OOP-Social

PDF: http://fulloo.info/Documents/RestoringFunctionAndFormToPatte...

Website: http://fulloo.info/

Alan, of you are aware of DCI, what is your response to it?

It (or more specifically, Jim Coplien) claims to build on your vision of OOP, but also criticises "emergence" within the OO vision. (Personally, I think those problems are design issues apart from the OO model)

We had a lot of fun with Trygve and we all learned a lot. I'm glad that they've been pushing at these issues.

In FOAM (the Feature-Oriented Active Modeler) we replace classes with Models, which are just collections of Axioms. There are pre-built Axiom types for standard things like methods and properties, but also for things like imports, exports, traits, listeners, topics, templates, actions, inner-models/classes, etc. Axioms are themselves modeled, so you can create new types as required. In the end, you still end up with a class, but it's defined/built with an extensible composition of objects rather than by a more limited and static class definition.

https://www.youtube.com/watch?v=S4LbUv5FsGQ

Could you list something to read please?

https://github.com/foam-framework/foam/wiki

https://github.com/foam-framework/foam/wiki/How-FOAM-is-Diff...

https://github.com/foam-framework/foam/wiki/KeyConcepts

http://foam-framework.github.io/foam/

Worth comparing to Dan Ingalls' Lively Kernel https://www.lively-kernel.org/

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