[Haskell-cafe] eager/strict eval katas

[Don Stewart]

benja.fallenstein:
> Hi Thomas,
> 
> On Dec 12, 2007 5:31 PM, Thomas Hartman <thomas.hartman at db.com> wrote:
> >   (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.)
> 
> Might it be worthwhile considering the use of a custom strict pair
> type instead of rewriting the strict fold functions? I.e., define
> 
> data Pair a b = Pair !a !b
> 
> and then use ordinary foldl' and foldr' on that.

And no need to even use custom ones, just use the library strict pairs,

    http://hackage.haskell.org/packages/archive/strict/0.2/doc/html/Data-Strict-Tuple.html

Reuse! Reuse!