[Haskell-cafe] Re: Implementing "unionAll"
haskell at benmachine.co.uk
Thu Feb 18 11:04:57 EST 2010
On Thu, Feb 18, 2010 at 8:07 AM, Evan Laforge <qdunkan at gmail.com> wrote:
> And BTW again, here's something I've occasionally found useful:
> -- | Handy to merge or sort a descending list.
> reverse_compare :: (Ord a) => a -> a -> Ordering
> reverse_compare a b = case compare a b of
> LT -> GT
> EQ -> EQ
> GT -> LT
I wondered why there wasn't one of these in the standard library until
someone pointed out to me that
reverse_compare = flip compare
which actually takes fewer characters to type :P
More information about the Haskell-Cafe