On Jul 27, 11:57 am, Aaron Cohen <aa...@assonance.org> wrote:
> On Wed, Jul 27, 2011 at 2:39 PM, Ken Wesson <kwess...@gmail.com> wrote:
> > On Wed, Jul 27, 2011 at 2:35 PM, Aaron Cohen <aa...@assonance.org> wrote:
> > > I may be wrong, but don't you need to swap the order of the arguments to
> > f?
>
> > You can do that by writing f itself appropriately. Usually either it
> > will be a closure or it won't matter (core +, etc.).
>
> If the order of evaluation doesn't matter, you should probably just be using
> reduce in the first place.

I wrote my foldr to swap the order of arguments to f, but I think
Ken's right not to. Having acc be on the right is a good reminder that
you're folding right, and makes some of the most common patterns, like
(cons x acc) look natural.

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