Trees go extremely well with FP. In fact, a lot of Elm's core data structures are implemented with trees. Dicts, Arrays, Sets. Here's an example of a zipper pac

Trees go extremely well with FP. In fact, a lot of Elm's core data structures are implemented with trees. Dicts, Arrays, Sets. Here's an example of a zipper package in Elm: http://package.elm-lang.org/packages/wernerdegroot/listzipper/latest http://package.elm-lang.org/packages/wernerdegroot/listzippe...