Higher-Order Functions - ModernesCpp.com
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haskell - How does this `++` implementation by `foldr` work? - Stack Overflow
Drawing foldl and foldr – Blog – Joachim Breitner's Homepage
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Higher Order Functions - Learn You a Haskell for Great Good!
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Fold - HaskellWiki
Week 15: A tutorial on the expressiveness and universality of fold | Swizec Teller
Functional Programming - Reduce / fold - YouTube
1 Foldl and Foldr In class we discussed the foldl | Chegg.com
Right and left folds, primitive recursion patterns in Python and Haskell - Eli Bendersky's website
