I would like to share an experience I started at the end of 2005 and I followed in time up to now (in 2017). In 2005, the team I was working in (3 persons) started a from-scratch rebuild of a legacy Notes application. Today, it is a huge monolith application with lots of legacy code, having several issues these kind of application have. My goal is to retrospect its history, to hightlight impacts of some choices and then try to find solutions.
In the previous post, I started a first F# implementation, showing "beauty" of F# code ;). Now it is time to improve a bit the controller function to be more fluent.
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.