The promise of functional programming is code that is easier to reason about, test and maintain. Referential transparency means there is no extra context to worry about, we can just focus on inputs and outputs. Examples of functional programming in the small are plentiful. Fibonacci is easy to write as a function but what about fp in the large?
Http4s is a web framework written in scala that takes a pure functional approach to building http services. Ross Baker is a contributor to http4s and he explains the benefits of this approach. We also touch on the benefits of working remotely, since he and I have both been doing it for some time.