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Within LTS Haskell 24.49 (ghc-9.10.3)

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  1. fromMaybeOrM_ :: (Applicative m, Monoid b) => Maybe a -> m b -> m b

    from-sum Control.FromSum

    A fliped version of fromMaybeM.

  2. parseFrontmatterMaybe :: ByteString -> Maybe ByteString

    frontmatter Data.Frontmatter

    parseFrontmatter but returning a Maybe

  3. parseYamlFrontmatterMaybe :: FromJSON a => ByteString -> Maybe a

    frontmatter Data.Frontmatter

    parseYamlFrontmatter but returning a Maybe

  4. catMaybes :: [Maybe a] -> [a]

    github GitHub.Internal.Prelude

    The catMaybes function takes a list of Maybes and returns a list of all the Just values.

    Examples

    Basic usage: 
    >>> catMaybes [Just 1, Nothing, Just 3]
[1,3]
    When constructing a list of Maybe values, catMaybes can be used to return all of the "success" results (if the list is the result of a map, then mapMaybe would be more appropriate): 
    >>> import GHC.Internal.Text.Read ( readMaybe )

>>> [readMaybe x :: Maybe Int | x <- ["1", "Foo", "3"] ]
[Just 1,Nothing,Just 3]

>>> catMaybes $ [readMaybe x :: Maybe Int | x <- ["1", "Foo", "3"] ]
[1,3]

  5. executeRequestMaybe :: forall am (mt :: MediaType Type) a . (AuthMethod am, ParseResponse mt a) => Maybe am -> GenRequest mt 'RO a -> IO (Either Error a)

    github GitHub.Request

    Helper for picking between executeRequest and executeRequest'. The use is discouraged.

  6. class EventHasMaybeSender eventKind

    github-webhooks GitHub.Data.Webhooks.Events

    Represents an event that may contain its sender information.

  7. extractSymMaybe :: forall (knd :: SymbolKind) . (ExtractSym a, IsSymbolKind knd) => a -> Maybe (SymbolSet knd)

    grisette Grisette.Core

    No documentation available.

  8. extractSymMaybe1 :: forall f a (knd :: SymbolKind) . (ExtractSym1 f, ExtractSym a, IsSymbolKind knd) => f a -> Maybe (SymbolSet knd)

    grisette Grisette.Core

    Lift the standard extractSymMaybe to unary type constructors.

  9. extractSymMaybe2 :: forall f a b (knd :: SymbolKind) . (ExtractSym2 f, ExtractSym a, ExtractSym b, IsSymbolKind knd) => f a b -> Maybe (SymbolSet knd)

    grisette Grisette.Core

    Lift the standard extractSymMaybe to binary type constructors.

  10. genericExtractSymMaybe :: forall a (knd :: SymbolKind) . (Generic a, GExtractSym Arity0 (Rep a), IsSymbolKind knd) => a -> Maybe (SymbolSet knd)

    grisette Grisette.Core

    Generic extractSym function.

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