3 key differences between Elixir and Ruby?

[StefanHoutzager]

You can btw work without implementation inheritance / subtype polymorphism in oo languages. Recommended.
Paper Do We Need Inheritance? from Wolfgang Weck and Clemens Szyperski:
https://pdfs.semanticscholar.org/3d49/436db0516018018aca6e17e9a0ca68db25ca.pdf