[Haskell-cafe] Left fold enumerator - a real pearl overlooked?

Johan Tibell johan.tibell at gmail.com
Sat Feb 28 12:59:53 EST 2009

On Sat, Feb 28, 2009 at 5:08 PM, Gü?nther Schmidt <gue.schmidt at web.de> wrote:
> Hi all,
> in the last few months I was looking for haskell database library,
> eventually settling for HDBC (thanks John btw).
> Takusen also caught my eye although I even failed installing it.
> Nevertheless a particular property of takusen, left-fold-enumerator, also
> sparked  my interest and I tried to follow it up.
> I had the impression this is something of relevance but something that is
> not mentioned or made use of often. There are actually only a few references
> on the net and most of those by one person only, Oleg.
> There was one post from John Goerzen about Haskell HTTP libraries in which
> he hinted using left-fold enumerators.
> Anyway what I'm saying is that the whole topic is somewhat off the radar of
> the larger haskell community, how come, or am I merely overestimating its
> relevance and usefulness?

A couple of people (me included) have been discussing different
possible designs outside this mailing list. I think we're getting a
better understanding of the design space but I feel like there's more
to be discovered which is probably the reason none of us have release
a library that makes use of left fold enumerators.



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