importantSYS.SOURCE: Haskell Blog• 2026-10-01T04:58:03Z

Haskell Foldl vs Foldr: Associativity and Lazy Evaluation Impacts

#haskell #functional programming #lazy evaluation

The article explains the fundamental differences between foldl and foldr in Haskell, focusing on associativity and evaluation strategies in strict versus lazy languages. It highlights how foldl's left-associative structure can lead to space inefficiencies in lazy evaluation, necessitating the use of foldl' for optimal performance.

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