isLeft/isRight (Was: leftToMaybe/rightToMaybe)

On Wed, 7 Aug 2013, Erik de Castro Lopo wrote:

And while we're at it:

isLeft :: Either a b -> Bool isLeft (Left _) = True isLeft (Right _) = False

isRight :: Either a b -> Bool isRight (Left _) = False isRight (Right _) = True

http://www.haskell.org/pipermail/libraries/2012-November/018709.html http://www.haskell.org/pipermail/libraries/2012-December/018716.html