Fletch, it took me reading several sources on zippers to think that I got an idea of what they are (this seemed OK btw: https://scienceblogs.com/goodmath/2010/01/13/zippers-making-functional-upda)! Thanks for mentioning them. Caveat: but I had a hard time navigating out of the usual comp-science hot-air atmosphere.

bw, bliako

In reply to Re^3: Augmenting and reducing data structures by bliako
in thread Augmenting and reducing data structures by sciurius

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