these vs fused-effects

these

An either-or-both data type, with corresponding hybrid error/writer monad transformer. (by isomorphism)

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fused-effects

A fast, flexible, fused effect system for Haskell (by fused-effects)

Control Fused Haskell Effects algebraic-effects

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these		fused-effects
	Project
-	Mentions	3
115	Stars	635
0.0%	Growth	0.6%
3.4	Activity	4.5
7 days ago	Latest Commit	about 2 months 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.

these

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

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

fused-effects

Posts with mentions or reviews of fused-effects. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-11-17.

Where's more discussion of the designs of effect systems?
4 projects | /r/ProgrammingLanguages | 17 Nov 2021

Languages such as Koka only support algebraic effects, not scoping operations such as catch and listen. The Effect Handlers in Scope paper introduces scoping operations, which lead to the Haskell libraries fused-effects and polysemy, but they turned out to have some weird semantics. eff is her effort to fix that.
Haskell doesn't make sense without pure functions
4 projects | /r/haskell | 2 Oct 2021
Monthly Hask Anything (June 2021)
16 projects | /r/haskell | 2 Jun 2021

What are some alternatives?

When comparing these and fused-effects you can also consider the following projects:

capability - Extensional capabilities and deriving combinators

polysemy - :gemini: higher-order, no-boilerplate monads

conduit-combinators - Type classes for mapping, folding, and traversing monomorphic containers

eveff - Efficient Haskell effect handlers based on evidence translation.

unexceptionalio - IO without any PseudoExceptions

eff - 🚧 a work in progress effect system for Haskell 🚧

control-monad-exception - Explicitly Typed exceptions as a library

freer-simple - A friendly effect system for Haskell

extensible-effects - Extensible Effects: An Alternative to Monad Transformers

control-monad-free - Free monads and monad transformers

abstract-par

ghc - Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).