BSD-3-Clause licensed by Dennis Gosnell
This version can be pinned in stack with:from-sum-0.2.3.0@sha256:b2c64e1e2073f6cfb9b69a6205606042d9dcb3b2742a7d598f574ba62f5de4ad,1321
Module documentation for 0.2.3.0
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]
0.2.3.0
- Add functions
collapseErrExceptT
, liftEitherExceptT
,
fromEitherExceptT
, fromEitherOrExceptT
, fromEitherMExceptT
,
fromEitherOrMExceptT
, fromMaybeExceptT
, fromMaybeOrExceptT
,
fromMaybeMExceptT
, fromMaybeOrMExceptT
, guardExceptT
, and
guardMExceptT
. These functions help convert Maybe
, Either
, and
Bool
to ExceptT
. #2
0.2.2.0
- Added new functions maybeToEither, maybeToEitherOr, and eitherToMaybe for
converting between
Maybe
and Either
.
#1