This is one with functional lists:
diag = foldr1 (zipWith (.) $. id ~> (id:) ~> id)
$. map (++ repeat id) ~> takeWhile (not.null.($[]))
$. (map.map) (:) ~> ($[]) . mconcat
On Apr 20, 2009, at 1:48 PM, Sebastian Fischer wrote:
On Apr 18, 2009, at 2:48 AM, Sjoerd Visscher wrote:
using Matt Hellige's pointless fun
http://matt.immute.net/content/pointless-fun
diag = foldr1 (zipWith (++) $. id ~> ([]:) ~> id)
$. map (++ repeat []) ~> takeWhile (not.null)
$. (map.map) (:[]) ~> concat
pretty! Those seem to be exactly the combinators that I was looking
for.
Unfortunately, I still don't manage to mimic my version that uses
functional lists and continuations (but no ++) mainly because I'm
lacking an equivalent of the second line of the above solution which
allows for the simpler 'zipWith (++)' instead of the merge function.
Anyway, once you know what they mean, Matt's combinators are quite
useful. Thanks for pointing that out!
Cheers,
Sebastian
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Sjoerd Visscher
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