On: How laziness changes thinking in Haskell

[T_S_]

The example given in the article can be addressed by using foldl' instead of foldr. The issue is discussed in

http://www.haskell.org/haskellwiki/Foldr_Foldl_Foldl

A Haskell programmer needs to understand when non-strict evaluation can/should be avoided. foldr is usually more elegant but sometimes less efficient.

[Deestan → T_S_]

Your link is missing the ' at the end.

http://www.haskell.org/haskellwiki/Foldr_Foldl_Foldl%27