| Copyright | (c) 2016 Stephen Diehl (c) 2016-2018 Serokell (c) 2018-2019 Kowainik |
|---|---|
| License | MIT |
| Maintainer | Kowainik <xrom.xkov@gmail.com> |
| Safe Haskell | Safe |
| Language | Haskell2010 |
Relude.List.NonEmpty
Description
This module contains safe functions to work with list type in terms of NonEmpty.
Synopsis
- viaNonEmpty :: (NonEmpty a -> b) -> [a] -> Maybe b
- whenNotNull :: Applicative f => [a] -> (NonEmpty a -> f ()) -> f ()
- whenNotNullM :: Monad m => m [a] -> (NonEmpty a -> m ()) -> m ()
Documentation
viaNonEmpty :: (NonEmpty a -> b) -> [a] -> Maybe b Source #
For safe work with lists using functinons for NonEmpty.
>>>viaNonEmpty head [1]Just 1>>>viaNonEmpty head []Nothing
whenNotNull :: Applicative f => [a] -> (NonEmpty a -> f ()) -> f () Source #
Performs given action over NonEmpty list if given list is non empty.
>>>whenNotNull [] $ \(b :| _) -> print (not b)>>>whenNotNull [False,True] $ \(b :| _) -> print (not b)True
whenNotNullM :: Monad m => m [a] -> (NonEmpty a -> m ()) -> m () Source #
Monadic version of whenNotNull.