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Talk:Blow your mind

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Revision as of 14:37, 20 December 2006 by Dougm (Talk | contribs)

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1 Could these be on their own page?

Hi Johannes - Great stuff on your page. Have you thought about making it an actual page in the WIKI? You could then add
and more people would find it. BrettGiles 16:19, 1 March 2006 (UTC)

2 Name?

Is there a better name for this page? —Ashley Y 00:55, 2 March 2006 (UTC)

i completely agree, the name pretty much sucks. but what i really wanted, was to compile a collection of "idioms" that would enlarge the readers perception of what is possible in Haskell and how to go about it. so, i'll have to find a name that reflects this plan. —--Johannes Ahlmann 14:13, 2 March 2006 (UTC)

3 Elegance before pyrotechnics

The polynomial algorithms are indeed mind-blowing, like the excess of Mardi Gras. They smuggle in subscripts, which (blessedly) Haskell usually banishes, disguised in a pyrotechnic display of abstraction, replication, concatenation, composition and enumeration.

Gilles Kahn invented a much more docile and beautiful way to do these things with true Haskell elegance long before Haskell:

 instance Num a => [a] where
   fs + [] = fs
   [] + gs = gs
   (f:fs) + (g:gs) = f+g : fs+gs
   (f:fs) * (g:gs) = f*g : [f]*gs + fs*(g:gs)
   _ * _ = []

Unlike the mind-blowing version, this code works on infinite series as well as polynomials. —User:dougm:Doug McIlroy 20 December 2006