Proposal: Add isLeft/isRight to Data.Either
illissius at gmail.com
Wed Dec 5 09:13:44 CET 2012
+1 for maybeLeft/maybeRight too
On Tue, Dec 4, 2012 at 11:04 PM, Henning Thielemann
<lemming at henning-thielemann.de> wrote:
> On Tue, 4 Dec 2012, Herbert Valerio Riedel wrote:
>> btw, what I've been missing even more than isLeft/isRight is something
>> leftMaybe :: Either a b -> Maybe a
>> leftMaybe (Left x) = Just x
>> leftMaybe _ = Nothing
>> rightMaybe :: Either a b -> Maybe b
>> rightMaybe (Right x) = Just x
>> rightMaybe _ = Nothing
> These seem to be more useful for me than isLeft and isRight.
> However, I think I would prefer maybeLeft and maybeRight.
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