On Thu, 14 Mar 2002, Brian Huffman wrote: > In Haskell you can produce the desired behavior by using pattern guards. > Since the pattern guards always get evaluated before the result does, they > can be used to make things more strict. Here is the foldl example: > > strict x = seq x True > > foldl' :: (a -> b -> a) -> a -> [b] -> a > foldl' f z [] = z > foldl' f z (x:xs) > | strict z = foldl' f (f z x) xs > > You can make multiple arguments strict by using && or similar, e.g.: > > f x y | strict x && strict y = ... > f x y | all strict [x,y] = ... > > Of course, with the second example x and y must have the same type. > Hope this helps. > > - Brian Huffman
Thanks! that looks like a great haskell idiom to use! Jay Cox _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
