from-sum
Canonical fromMaybeM and fromEitherM functions.
https://github.com/cdepillabout/from-sum
| Version on this page: | 0.2.0.0 |
| LTS Haskell 22.19: | 0.2.3.0 |
| Stackage Nightly 2024-04-27: | 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-0.2.0.0@sha256:316199c77c9374f105507488b90c47def9ff83308d4191645fcc6c20c7ca364c,1146Module documentation for 0.2.0.0
- Control
Depends on 2 packages(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]