contravariant vs managed

contravariant

Haskell 98 contravariant functors (by ekmett)

Control Contravariant

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hackage.haskell.org

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managed

A monad for managed values (by Gabriella439)

Control

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contravariant		managed
	Project
1	Mentions	-
72	Stars	49
-	Growth	-
0.0	Activity	0.0
almost 2 years ago	Latest Commit	about 1 year ago
Haskell	Language	Haskell
BSD 3-clause "New" or "Revised" License	License	BSD 3-clause "New" or "Revised" License

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

contravariant

Posts with mentions or reviews of contravariant. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-10-21.

Co-Applicative programming style
2 projects | /r/haskell | 21 Oct 2021

The operator also pops up in George Wilson's 2018 talk, Contravariant Functors: the Other Side of the Coin, along with (>*) and (*<) operators to help things along. Shortly after its publication, Issue #57 for contravariant was raised, suggesting not only (>*<) but the other operators from George's talk.

managed

Posts with mentions or reviews of managed. We have used some of these posts to build our list of alternatives and similar projects.

We haven't tracked posts mentioning managed yet.
Tracking mentions began in Dec 2020.

What are some alternatives?

When comparing contravariant and managed you can also consider the following projects:

control-monad-free - Free monads and monad transformers

distributed-fork - A distributed data processing framework in Haskell.

hdph - Haskell distributed parallel Haskell

unliftio - The MonadUnliftIO typeclass for unlifting monads to IO

effect-monad - Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.

parallel - a library for parallel programming

streamproc - Haskell library providing a continuation-based stream processor arrow

freer-simple - A friendly effect system for Haskell

recursion-schemes - Generalized bananas, lenses and barbed wire

motor - Type-safe effectful state machines in Haskell

can-i-haz - Generic implementation of the Has pattern for MonadReader/MonadState and CoHas for MonadError

monad-validate - (NOTE: REPOSITORY MOVED TO NEW OWNER: https://github.com/lexi-lambda/monad-validate) A Haskell monad transformer library for data validation