2008/11/5 Daryoush Mehrtash <dmehrtash at gmail.com>: > Are there cases (function or list) where the result of foldl (or foldr)would > be different that foldl' (or foldr')? Maybe this wiki article I wrote some time ago will answer your question: http://haskell.org/haskellwiki/Foldr_Foldl_Foldl' regards, Bas