Another fold question

[Thomas L. Bevan]

I stand corrected

On Thu, 6 Nov 2003 06:39 pm, Tomasz Zielonka wrote:
> On Thu, Nov 06, 2003 at 03:41:32PM +1100, Thomas L. Bevan wrote:
> > patty,
> >
> > what you have written is not a fold. A fold operates over a list. There
> > is no list in your code, only some sort of tree structure.
>
> I think you are wrong. Folds are not restricted to lists and lists are
> also "some sort of tree structure".
>
> See http://www.haskell.org/hawiki/WhatIsaFold
>
> Best regards,
> Tom

-- 
It is inconceivable that a judicious observer from another solar system
would see in our species -- which has tended to be cruel, destructive,
wasteful, and irrational -- the crown and apex of cosmic evolution.
Viewing us as the culmination of *anything* is grotesque; viewing us
as a transitional species makes more sense -- and gives us more hope.
- Betty McCollister, "Our Transitional Species", 
  Free Inquiry magazine, Vol. 8, No. 1
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