22 Jul
2020
22 Jul
'20
4:10 p.m.
A direct implementation without using a library is interesting, thank you. I refrained from doing that, because I thought that Control.Zipper would actually do this for me. Actually, I was pretty successful with using Control.Zipper to change node labels, but failed doing more complicated stuff.
Isn't that a strong indicator that zippers are an improper abstraction for your purpose? Perhaps after rolling your own implementation you can more easily discover how to represent the algrorithm as a zipper. Olaf