Re: [Haskell-cafe] Re: Implementing "unionAll"

On Thu, Feb 18, 2010 at 8:07 AM, Evan Laforge 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