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Haskell Blog Explains the Difference Between Foldl and Foldr
Original: Differences Between `Foldl` and `Foldr`
The official Haskell blog has published a new article explaining the differences between the foldl and foldr functions, two core recursion tools in the language. The post breaks down how the two folds evaluate differently, with implications for performance, laziness and stack behavior, a recurring point of confusion for developers learning functional programming.
Why now: Fold semantics and their performance pitfalls are a perennial source of confusion and debate among functional programmers.
Evidence
- Differences Between `Foldl` and `Foldr` · signa11 · 140
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