Left and Right Folds - Comparison of a mathematical definition and a programmatic one

Published: 08 Aug 2021

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We compare typical definitions of the left and right fold functions, with their mathematical definitions in Sergei Winitzki’s upcoming book: The Science of Functional Programming.
Errata: Slide 13: "The way foldl does it is by associating to the right", should, of course, end in "to the left".