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Within LTS Haskell 24.6 (ghc-9.10.2)

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  1. maybeGen :: Gen a -> Gen (Maybe a)

    checkers Test.QuickCheck.Instances.Maybe

    No documentation available.

  2. maybeBlank :: BPState (m :: Type -> Type) il bl -> !Bool

    commonmark Commonmark.Blocks

    No documentation available.

  3. maybeLazy :: BPState (m :: Type -> Type) il bl -> !Bool

    commonmark Commonmark.Blocks

    No documentation available.

  4. maybeName :: a -> Bool -> Maybe a

    dbus DBus.Generation

    No documentation available.

  5. maybeParseString :: Parser a -> String -> Maybe a

    dbus DBus.Internal.Address

    No documentation available.

  6. maybeParseString :: MonadThrow m => Parser a -> String -> m a

    dbus DBus.Internal.Types

    No documentation available.

  7. maybeEndOfExecutable :: String -> IO (Maybe String)

    end-of-exe EndOfExe2

    Can be used instead of os to check whether the executable ends in ".exe". The function returns IO Nothing if there is neither ys nor (ys ++ ".exe") names for executables in the search path. It can also search in other locations and its behaviour is OS dependent. For more information, please, refer to the link: https://hackage.haskell.org/package/directory-1.3.4.0/docs/System-Directory.html#v:findExecutable For more information, how the executable is searched, see also the following address: https://hackage.haskell.org/package/process-1.6.18.0/docs/System-Process.html#t:CmdSpec

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

    foundation Foundation

    The maybeToList function returns an empty list when given Nothing or a singleton list when given Just.

    Examples

    Basic usage: 
    >>> maybeToList (Just 7)
[7]

    >>> maybeToList Nothing
[]
    One can use maybeToList to avoid pattern matching when combined with a function that (safely) works on lists: 
    >>> import GHC.Internal.Text.Read ( readMaybe )

>>> sum $ maybeToList (readMaybe "3")
3

>>> sum $ maybeToList (readMaybe "")
0

  9. maybeRecord :: PersistableType q => RecordFromSql q a -> ColumnConstraint NotNull a -> RecordFromSql q (Maybe a)

    persistable-record Database.Record.FromSql

    Derivation rule of RecordFromSql parser function object for Haskell Maybe type.

  10. maybeWidth :: PersistableRecordWidth a -> PersistableRecordWidth (Maybe a)

    persistable-record Database.Record.Persistable

    Derivation rule of PersistableRecordWidth from from Haskell type a into for Haskell type Maybe a.

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