As a followup of the previous post, I would like to adjust the last example (using some comments' suggestions) and introduce a first basic F# implementation, which will allow to illustrate Railway Oriented Programming.
I already mentioned the video from Mark Seeman about Functional Architecture. I proposed sessions on this subject at SocratesCH to discuss and to understand it better. My understanding is still far from perfect, and in this blog post, I would like to give some feedbacks on experiments I have done with an OOP language, sketching hexagonal architecture implementations, before switching to functional implementation.