Re: [Haskell-cafe] eager/strict eval katas

benja.fallenstein:

Hi Thomas,

On Dec 12, 2007 5:31 PM, Thomas Hartman 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-... Reuse! Reuse!