My biggest time-waster this week was forgetting that the answer is always traverse.
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Do you know some resource to learn about traversals? Or is this more like something that pops up again and again naturally? While learning/writing Haskell I've used it couple of times, but would be interested to read something more... concentrated on the topic.
Also, a very loose intuition: Lens T R ~ "the T has exactly one R and some other things" Prism T R ~ "the T has exactly one R or some other things" Traversal T R ~ "the T has zero or many R and/or some other things" Iso T R ~ "the T has exactly one R and/or no other things"
