Keith Sheppard wrote:
Is there any reason that sum isn't strict? I can't think of any case
where that is a good thing.
Prelude> sum [0 .. 1000000]
*** Exception: stack overflow
As others have said, there are cases where non-strictness is what you
want. And if you are using a type that is strict (the common case),
GHC's optimizations will catch it.
The historical reason for this is that foldl' is not Haskell 98, only foldl.
- Jake
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