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Cats Core, Part 3: From Empty Batches to Checkout Totals

I knew how to combine two error reports. Monoid gives an empty batch a useful result, and foldMap takes the same idea to a shopping cart: turn each line into a contribution, then combine the totals.

8 Oct 2026 · 6 min read

#cats-core
#foldmap
#functional-programming
#monoid
#scala