[Haskell-cafe] Re: Guards
iakd0 at clusterf.urz.uni-halle.de
Mon Jan 10 04:55:51 EST 2005
On Sat, 8 Jan 2005, Lemming wrote:
> Jon Cast wrote:
> > Absolutely. In Haskell's syntax, if-then-else-if interacts badly with
> > do notation, and Haskell lacks a direct analogy to Lisp's cond.
> > case () of
> > () | p1 -> e1
> > | p2 -> e2
> > ...
> No problem:
> select :: a -> [(Bool, a)] -> a
> select def = maybe def snd . List.find fst
select def = fromMaybe def . lookup True
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