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Lifting functions for transformers #60

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chshersh opened this issue Aug 19, 2018 · 1 comment
Closed

Lifting functions for transformers #60

chshersh opened this issue Aug 19, 2018 · 1 comment
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new Bring something new into library (add function or type or interface)
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#1: JoJo's Bizarre Adventure (Septemb...
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v0.3.0: Combinators

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maybeToMaybeT :: Maybe a -> MaybeT m a
eitherToExceptT :: Either e a -> ExceptT e m a
@chshersh chshersh added the new Bring something new into library (add function or type or interface) label Aug 19, 2018
@chshersh chshersh added this to the v0.3.0: Combinators milestone Aug 19, 2018
@chshersh
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chshersh commented Sep 8, 2018

I see that such functions exist in errors package, which means, that we don't need to invent new names. Let's have the following functions:

hoistMaybe  :: Applicative m => Maybe a -> MaybeT m a
hoistEither :: Applicative m => Either e a -> ExceptT e m a

hlint rules can be added according to implementation.

vrom911 added a commit that referenced this issue Sep 9, 2018
@vrom911
[#60] Add lifting to transformers functions
7cc9f72
@vrom911 vrom911 mentioned this issue Sep 9, 2018
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#1: JoJo's Bizarre Adventure (September, 2018) automation moved this from To do to Done: issues Sep 9, 2018
chshersh pushed a commit that referenced this issue Sep 9, 2018
@vrom911 @chshersh
[#60] Add lifting to transformers functions (#77)
c8c3238
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new Bring something new into library (add function or type or interface)
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#1: JoJo's Bizarre Adventure (Septemb...
  
Done: issues
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v0.3.0: Combinators
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@chshersh @vrom911