I am a nodejs/express developer and am looking to move to a functional development approach. I have reviewed alot of information on the concepts of functional programming; monads, currying, functors, partial application, etc. but I am struggling to find examples explaining an ideal way a node.js express app folder structure should be organized when functional programming is utilized? How would functional programming change how business rules are organized and grouped? I am looking for online links, etc. that would walk through how organization changes in a move to fp. Most things I have seen so far cover the concepts like currying, functor, etc. but not applying within the concept of an application.