I enjoy simple mappings of input to outputs. For tree based processing functional programming Ocaml and Haskell are meant to be very effective. Especially if y

I enjoy simple mappings of input to outputs. For tree based processing functional programming Ocaml and Haskell are meant to be very effective. Especially if you can think of your problem as a functional isomorphism. When I created my toy database I used a pipeline of tuples that were reduced. Relational data is easy to process with functional ideas. Clojure pipelines are similar. My problem with functional programming is its readability. If someone had a different idea of how they would approach the problem functionally, it can be tricky to read the code that performs the functional mapping.