I'm trying to get a better handle on eager/strict eval in haskell, and a great way to do this is by building up from simple exercises to harder exercises. So far I have exercise 1) add the integers [1..10^6] (stack overflows if you do a naive fold, as described on wiki) exercise 2) find the first integer such that average of [1..n] is > [10^6] (solution involves building an accum list of (average,listLength) tuples. again you can't do a naive fold due to stack overflow, but in this case even strict foldl' from data.list isn't "strict enough", I had to define my own custom fold to be strict on the tuples.) anybody got other suggestions, or links to places where eager eval is required to solve simply stated problems? or exercises that demystify doing eager IO/eager whatever monad, where that is required? Also am I correct that the terms eager and strict can be used more or less interchangeably in this problem space? Tired of this folk wisdom that haskell is only for the elite because getting around stack overflow from lazy eval is impossible to teach to newbies. t. --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.