Note also that zipMap is the classic S combinatory if you think of lists as functions over the natural numbers, so there's something especially compelling about it. Similarly, repeat is K. From zipMap & repeat, you can easily define map, zip, zipWith, zipWith3, etc. s = zipWith ($) k = repeat mapT f xs = s (k f) xs zipWithT f as bs = s (mapT f as) bs zipT = zipWithT (,) zipWith3T f as bs cs = s (zipWithT f as bs) cs - Conal -----Original Message----- From: Mieszko Lis [mailto:elf@sandburst.com] Sent: Thursday, March 08, 2001 6:30 PM To: Eric Allen Wohlstadter Cc: haskell-cafe@haskell.org Subject: Re: zips and maps Eric Allen Wohlstadter wrote:
I find myself very often needing to use this function and was wondering if there was already a way to do this using zip,maps, and folds.
Do you mind using zipWith? How about zipMap = zipWith ($) ..? -- Mieszko _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe