from-sum
Canonical fromMaybeM and fromEitherM functions.
https://github.com/cdepillabout/from-sum
| Version on this page: | 0.2.1.0 |
| LTS Haskell 24.17: | 0.2.3.0 |
| Stackage Nightly 2025-10-26: | 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-0.2.1.0@sha256:066082bd3023017326216d31f32a49a94b0cf5f2af5fba8cf5d1b9e3fb94bd9d,1146Module documentation for 0.2.1.0
- Control
Depends on 2 packages(full list with versions):
Used by 1 package in lts-13.11(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]