from-sum
Canonical fromMaybeM and fromEitherM functions.
https://github.com/cdepillabout/from-sum
| Version on this page: | 0.2.2.0 |
| LTS Haskell 24.17: | 0.2.3.0 |
| Stackage Nightly 2025-10-30: | 0.2.3.0 |
| Latest on Hackage: | 0.2.3.0 |
Maintained by [email protected]
This version can be pinned in stack with:
from-sum-0.2.2.0@sha256:7ddedfd4602adc2a6bdd6a2ad72de930a2598abc4422a6aeaf84225a729f7f78,1261Module documentation for 0.2.2.0
- Control
Depends on 2 packages(full list with versions):
Used by 1 package in lts-14.20(full list with versions):
Control.FromSum
This Haskell module exports the fromEitherM and fromMaybeM convenience
functions.
fromMaybeM :: m a -> Maybe a -> m a
fromEitherM :: (e -> m a) -> Either e a -> m a
fromEitherM leftAction eitherValue is the same as either leftAction pure eitherValue.
fromMaybeM nothingAction maybeValue is the same as maybe nothingAction pure maybeValue.
Usage
>>> import Control.FromSum (fromEitherM, fromMaybeM)
>>> fromMaybeM [] $ Just 5
[5]
>>> fromMaybeM [] Nothing
[]
>>> fromEitherM (\s -> [length s]) $ Right 5
[5]
>>> fromEitherM (\s -> [length s]) $ Left "foo"
[3]