Re: leftToMaybe/rightToMaybe

On 2013-08-06 at 12:21:14 +0200, Christopher Done wrote:

How about popping these in Data.Either?

-- | Maybe get the left side of an Either. leftToMaybe :: Either a b -> Maybe a leftToMaybe = either Just (const Nothing)

-- | Maybe get the right side of an Either. rightToMaybe :: Either a b -> Maybe b rightToMaybe = either (const Nothing) Just

+1 Some minor nitpicking: IMHO, the naming is inconsistent with respect to the existing functions: listToMaybe :: [a] -> Maybe a maybeToList :: Maybe a -> [a] In these two cases, '[lL]ist' and '[mM]aybe' both denote types, whereas in '{left,right}ToMaybe', 'left' is a constructor and 'Maybe' is a type. However, I have no better naming alternative to offer. -- hvr