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maybeToEither :: b -> Maybe a -> Either b ahaskoin-core Haskoin.Util.Helpers Transform a Maybe value into an Either value. Just is mapped to Right and Nothing is mapped to Left. Default Left required.
maybeFilePath :: Event -> Maybe RawFilePathhinotify System.INotify No documentation available.
maybeFilePath :: Event -> Maybe RawFilePathhinotify System.INotify No documentation available.
maybeFilePath :: Event -> Maybe RawFilePathhinotify System.INotify No documentation available.
maybeFilePath :: Event -> Maybe RawFilePathhinotify System.INotify No documentation available.
maybeFilePath :: Event -> Maybe RawFilePathhinotify System.INotify No documentation available.
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incipit-base Incipit.Base 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
maybeToLeft :: r -> Maybe l -> Either l rincipit-base Incipit.Either Turn Just into Left and Nothing into Right with the supplied value.
maybeToRight :: l -> Maybe r -> Either l rincipit-base Incipit.Either Turn Just into Right and Nothing into Left with the supplied value.
maybeBraces :: Bool -> Doc -> Docliquid-fixpoint Text.PrettyPrint.HughesPJ.Compat