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1. mayBeNull :: Arg -> Bool

   haskell-gi	Data.GI.GIR.Arg

   No documentation available.

2. maybeAuthorized :: Yesod site => Route site -> Bool -> HandlerT site IO (Maybe (Route site))

   yesod-core	Yesod.Core

   Return the same URL if the user is authorized to see it. Built on top of isAuthorized. This is useful for building page that only contain links to pages the user is allowed to see.

3. maybeCryptoError :: CryptoFailable a -> Maybe a

   cryptonite	Crypto.Error

   Transform a CryptoFailable to a Maybe

4. maybeTagText :: Tag str -> Maybe str

   tagsoup	Text.HTML.TagSoup

   Extract the string from within TagText, otherwise Nothing

5. maybeTagWarning :: Tag str -> Maybe str

   tagsoup	Text.HTML.TagSoup

   Extract the string from within TagWarning, otherwise Nothing

6. maybeToList :: Maybe a -> [a]

   strict	Data.Strict.Maybe

   Analogous to maybeToList in Data.Maybe.

7. maybeCodec :: ValueCodec input output -> ValueCodec (Maybe input) (Maybe output)

   autodocodec	Autodocodec

   Maybe codec This can be used to also allow null during decoding of a Maybe value. During decoding, also accept a null value as Nothing. During encoding, encode as usual.

   Example usage

   >>> toJSONVia (maybeCodec codec) (Just 'a')
   String "a"
   
   >>> toJSONVia (maybeCodec codec) (Nothing :: Maybe Char)
   Null
   

8. maybeCodec :: ValueCodec input output -> ValueCodec (Maybe input) (Maybe output)

   autodocodec	Autodocodec.Codec

   Maybe codec This can be used to also allow null during decoding of a Maybe value. During decoding, also accept a null value as Nothing. During encoding, encode as usual.

   Example usage

   >>> toJSONVia (maybeCodec codec) (Just 'a')
   String "a"
   
   >>> toJSONVia (maybeCodec codec) (Nothing :: Maybe Char)
   Null
   

9. maybeToLeft :: b -> Maybe a -> Either a b

   either	Data.Either.Combinators

   Maybe produce a Left, otherwise produce a Right.

   >>> maybeToLeft "default" (Just 12)
   Left 12
   

   >>> maybeToLeft "default" Nothing
   Right "default"
   

10. maybeToRight :: b -> Maybe a -> Either b a

    either	Data.Either.Combinators

    Maybe produce a Right, otherwise produce a Left.

    >>> maybeToRight "default" (Just 12)
    Right 12
    

    >>> maybeToRight "default" Nothing
    Left "default"
    

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