ยค mapfilter, plookup, et al
Various utility functions for the \code{Maybe} type.
Types
mapfilter :: ??
plookup :: Foldable t => (a -> Bool) -> t (a, b) -> Maybe b
mapMaybe :: ??
stripMaybe :: ??
stripMaybeDef :: ??
isM :: ??
Description
These functions provides various common operations relating to
the Maybe type.
