Ruby is a fully OOP language but doesn't have multiple inheritance either. Every class is open though (you can add/change methods in them), and you can create the equivalence of multiple inheritance by using **modules** and **mixins** where you **include** them in **classes** to extend them.
You can use this paradigm with Nim too, as it also provides for **modules**. There's lots of ways to define and do/implement OO paradigms. Below is tutorial info on Ruby's implementation of its OOP paradigm [https://launchschool.com/books/oo_ruby/read/the_object_model](https://launchschool.com/books/oo_ruby/read/the_object_model) [https://www.tutorialspoint.com/ruby/ruby_object_oriented.htm](https://www.tutorialspoint.com/ruby/ruby_object_oriented.htm) Once you figure out the characteristics/features you want to have in your OOP paradigm then you can build it.
