[Haskell-cafe] Re: Bathroom reading
a.biurvOir4 at asuhan.com
Fri Aug 17 05:25:11 EDT 2007
> Someone mentioned the "Blow your mind" page.
> One example there really caught my attention.
> "1234567" => ("1357","246")
> foldr (\a ~(x,y) -> (a:y,x)) (,)
> I've known about lazy match since an early version of the Haskell
> report, but have never actually used it. Last night, looking at
> that example, the lights went on and I finally grokked why it's
> there and understood when/why I might use it myself.
Don't you want an infinite list to illustrate the necessity
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