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Double factorial

Name: Anonymous 2009-02-27 13:02

GHCi, version 6.8.2: http://www.haskell.org/ghc/  :ihbt for help
Loading package base ... linking ... done.
Prelude> let fact n = product [1..n]
Prelude> fact 5
120
Prelude> let doubleFact = fact.fact
Prelude> doubleFact 3
720
Prelude>

Name: Anonymous 2009-02-27 15:31

>>5
Dude.

Name: FrozenVoid 2009-02-27 15:38

Factorizing integers to compute factorials seems wasteful to me.
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