Safe Haskell | Safe-Inferred |
---|
A strict version of the Maybe
type.
Import qualified, as in
import qualified Agda.Utils.Maybe.Strict as Strict
Copyright : (c) 2006-2007 Roman Leshchinskiy (c) 2013 Simon Meier License : BSD-style (see the file LICENSE)
Copyright : (c) 2014 Andreas Abel
- module Data.Strict.Maybe
- toStrict :: Maybe a -> Maybe a
- toLazy :: Maybe a -> Maybe a
- listToMaybe :: [a] -> Maybe a
- maybeToList :: Maybe a -> [a]
- catMaybes :: [Maybe a] -> [a]
- mapMaybe :: (a -> Maybe b) -> [a] -> [b]
- unionMaybeWith :: (a -> a -> a) -> Maybe a -> Maybe a -> Maybe a
- unzipMaybe :: Maybe (a, b) -> (Maybe a, Maybe b)
- filterMaybe :: (a -> Bool) -> a -> Maybe a
- forMaybe :: [a] -> (a -> Maybe b) -> [b]
- caseMaybe :: Maybe a -> b -> (a -> b) -> b
- maybeM :: Monad m => m b -> (a -> m b) -> m (Maybe a) -> m b
- fromMaybeM :: Monad m => m a -> m (Maybe a) -> m a
- caseMaybeM :: Monad m => m (Maybe a) -> m b -> (a -> m b) -> m b
- ifJustM :: Monad m => m (Maybe a) -> (a -> m b) -> m b -> m b
- whenJust :: Monad m => Maybe a -> (a -> m ()) -> m ()
- whenJustM :: Monad m => m (Maybe a) -> (a -> m ()) -> m ()
Documentation
module Data.Strict.Maybe
listToMaybe :: [a] -> Maybe aSource
Analogous to listToMaybe
in Data.Maybe.
maybeToList :: Maybe a -> [a]Source
Analogous to maybeToList
in Data.Maybe.
catMaybes :: [Maybe a] -> [a]Source
Analogous to catMaybes
in Data.Maybe.
mapMaybe :: (a -> Maybe b) -> [a] -> [b]Source
Analogous to mapMaybe
in Data.Maybe.
Collection operations.
unionMaybeWith :: (a -> a -> a) -> Maybe a -> Maybe a -> Maybe aSource
unionWith
for collections of size <= 1.
unzipMaybe :: Maybe (a, b) -> (Maybe a, Maybe b)Source
Unzipping a list of length <= 1.
filterMaybe :: (a -> Bool) -> a -> Maybe aSource
Filtering a singleton list.
filterMaybe p a =listToMaybe
(filter
p [a])
Conditionals and loops.
Monads and Maybe.
fromMaybeM :: Monad m => m a -> m (Maybe a) -> m aSource
Monadic version of fromMaybe
.
caseMaybeM :: Monad m => m (Maybe a) -> m b -> (a -> m b) -> m bSource
ifJustM :: Monad m => m (Maybe a) -> (a -> m b) -> m b -> m bSource
caseMaybeM
with flipped branches.