First this is not an assignment. Just a general knowledge.
I have previously raised a question about Java OO Design. As I have been self learning Ruby on Rails. In Ruby programming, I cannot find any good book talking about OO design in Ruby programming. However, it seems to be a common question for Ruby OO Design.
I am wondering any Ruby Experts here can help me to understand what is OO Design in Ruby programming.. I can't find any abstract class or interface used in Ruby programming. I am very sure I am wrong and need you experts to help me understand.
Thank you in advance.