eff
ðŸš§ a work in progress effect system for Haskell ðŸš§ (by hasura)
extensibleeffects
Extensible Effects: An Alternative to Monad Transformers (by suhailshergill)
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eff  extensibleeffects  

15  1  
514  175  
0.0%    
0.5  0.0  
about 2 years ago  about 2 years ago  
Haskell  Haskell  
ISC License  MIT License 
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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.
eff
Posts with mentions or reviews of eff.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 20221213.

Effectful  PaweÅ‚ Szulc  Lambda Days 2022
Details are in https://github.com/hasura/eff/issues/12 and https://www.reddit.com/r/haskell/comments/pywuqg/unresolved_challenges_of_scoped_effects_and_what/.

Looking for languages that combine algebraic effects with parallel execution
You'll get fearless parallel with STM in the mixture, and GHC is getting a work in progress effect system for Haskell, as Delimited continuation primops has been merged.

Should I pick up OCaml or Haskell?
My last example is algebraic effects, some of which have been made possible in a both practical and efficient way thanks to extremely recent research, and that I can use to implement architectures like Ports and Adapters or Clean Architecture and have very maintainable code. (Extensible Effects â€” An Alternative to Monad Transformers was published in 2013, Effect Handlers in Scope was published in 2014 and they are behind Polysemy, while there is ongoing work on effects with even better performance, like Eff)

[ANN] cleff  fast and consise extensible effects
cleff's Eff monad is esentially implemented as a ReaderT IO. [...] This is first done by eff, [...]

Opinions on Reader + Continuationbased IO?
Here is link number 1  Previous text "eff"
This is essentially how continuation based effect systems work, check out eveff and eff.

Where's more discussion of the designs of effect systems?
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 fusedeffects and polysemy, but they turned out to have some weird semantics. eff is her effort to fix that.
While her eff is still under construction, there are relative more mature pieces like Koka etc. I'd very much like to understand how her concerns map to those other effect systems, but can't find more writeups about the design space of effect systems.

The Problem of Effects (2020)
Let me tell you what I'm worried about with effects systems: One of the smartest people I know of has a library called Eff https://github.com/hasura/eff that efficiently implements effects through some modifications to GHC. The thing is, she's pretty much stopped working on because she found some really nasty semantic edgecases that she couldn't resolve to her satisfaction. (I don't understand the problems well enough to describe them, and I think they're specific to lazy languages, but it has left me cautious about the effect model in general.)

A solid GUI Framework for Haskell?
Why do you need a GUI library, if you can write your application using extensible effects frameworks, just choose any and enjoy!
extensibleeffects
Posts with mentions or reviews of extensibleeffects.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 20210627.

A solid GUI Framework for Haskell?
Why do you need a GUI library, if you can write your application using extensible effects frameworks, just choose any and enjoy!
What are some alternatives?
When comparing eff and extensibleeffects you can also consider the following projects:
ether  Monad Transformers and Classes
frpnow
freersimple  A friendly effect system for Haskell
controlmonadexception  Explicitly Typed exceptions as a library
atl  Arrow Transformer Library
effectmonad  Provides 'graded monads' and 'parameterised monads' to Haskell, enabling finegrained reasoning about effects.
MonadRandom  A monad transformer and corresponding type class for computations which consume random values.
ControlMonadMultiPass
fusedeffects  A fast, flexible, fused effect system for Haskell
freereffects  An implementation of "Freer Monads, More Extensible Effects".
frpzoo  Comparing many FRP implementations by reimplementing the same toy app in each.