What are the best functional pearls to read?

I found the functional pearls amazing reads. I was particularly fond with the Zipper paper. However, there are just too many of these papers. I was wondering which papers have the highest leverage in terms of improving your functional programming skills. Which papers are your personal favorite to read?


I really enjoyed this functional pearl about nested datacubes:

Elegant approach on using monoidal maps to have simple grouping and aggregation of records. I used this technique once in a past to produce team reports.

I like A Play on Regular Expressions. The writing style as well as the content are great; and it’s also very accessible to people who (relatively) new to Haskell so it’s one I frequently recommend.

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