great for reading trees, but not for cases where nodes need to be added or removed. There's a "zipper tree" structure but it's kind of a pain to implement: htt

great for reading trees, but not for cases where nodes need to be added or removed. There's a "zipper tree" structure but it's kind of a pain to implement: https://github.com/xdavidliu/fun-problems/blob/main/zipper-tree.hs https://github.com/xdavidliu/fun-problems/blob/main/zipper-t...