On: Notes on Haskell: What's Wrong with the For Loop

[Fargren]

Well, if you don't want to work with the whole sequence, you can filter it. But yeah, in those cases and some others, the for loop may be more idiomatic and better performing.

[Dn_Ab → Fargren]

Yes I'm talking about being able to stop early for one example. Or if the thing you are dealing with is not actually a sequence for another.

[darklajid → Dn_Ab]

The former can probably be solved for lots of cases by TakeWhile(), which evaluates before consuming more elements and could be used to replace "abort the loop" patterns.

The latter is a different thing..

1: http://msdn.microsoft.com/en-us/library/bb534804.aspx