Monad.Maybe

Utility functions to work with Maybe data type as monad.

Documentation

whenJust :: Applicative f => Maybe a -> (a -> f ()) -> f ()

whenJustM :: Monad m => m (Maybe a) -> (a -> m ()) -> m ()

whenNothing :: Applicative f => Maybe a -> f a -> f a

whenNothing_ :: Applicative f => Maybe a -> f () -> f ()

whenNothingM :: Monad m => m (Maybe a) -> m a -> m a

whenNothingM_ :: Monad m => m (Maybe a) -> m () -> m ()