cleff
eff
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cleff | eff | |
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5 | 18 | |
102 | 546 | |
- | 0.9% | |
0.0 | 0.0 | |
11 months ago | 12 months ago | |
Haskell | Haskell | |
BSD 3-clause "New" or "Revised" License | ISC License |
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cleff
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Implicit parameters vs ReaderT
I ended up using a different approach to guiding inference in my project, but I still thought the IP way was cool
- Comparing ZIO to Haskell effects libraries like Polysemy?
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Effect Zoo for Scala 3
Consider 2 Haskell projects: Cleff and Effectful. They both are extensible effect systems, built around ReaderT design pattern. At their core, they use fused ReaderT + IO monad, with extensible environment. This architecture is very similar to ZIO's. All 3 even share the same limitation - inability to express nondeterminism (not very relevant fact, but I just want to emphasize the similarity).
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[ANN] effectful - an easy to use, performant extensible effects library
cleff and effectful are very similar, to the point that I offered to join forces (for the record, majority of the conversation refers to things that are no longer true for both libraries as we inspired each other to fix most quirks :). The main difference is the internal environment - in effectful it's mutable, while in cleff it's immutable. All differences pretty much grow from this. The main ones:
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[ANN] cleff - fast and consise extensible effects
I'm pleased to announce cleff, a new extensible effects library for Haskell: https://github.com/re-xyr/cleff.
eff
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Haskellers who moved to Rust: What has been your experience?
You can swap-out implementations for testing, avoid the crazy N^2 instances issues, etc. They're pretty cool. Currently there are many competing libraries. polysemy and eff both have good examples on their homepages.
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What are the current hot topics in type theory and static analysis?
Effect systems and Algebraic effects. ocaml has just released a stripped-down effect system. People are also working on Effect systems for Haskell (eff, fused-effects, effet). Koka is a language built with effects first and foremost and it’s rapidly gaining popularity. Unison also has effects.
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[ANNOUNCE] GHC 9.6.1 is now available
There are also a few subtle issues that arise with delconts related to semantics of higher order effects (see here and here), but they might be solvable.
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Effectful | Paweł 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/.
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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.
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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 — 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)
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[ANN] cleff - fast and consise extensible effects
cleff's Eff monad is esentially implemented as a ReaderT IO. [...] This is first done by eff, [...]
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Opinions on Reader + Continuation-based IO?
Here is link number 1 - Previous text "eff"
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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 fused-effects and polysemy, but they turned out to have some weird semantics. eff is her effort to fix that.
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Languages that don't support Error-Catching as a Control Structure?
There are a few languages that have algebraic effect systems, most notably Haskell, but these systems are implemented as libraries, not baked into the language (which can have advantages and disadvantages).
What are some alternatives?
effectful - An easy to use, fast extensible effects library with seamless integration with the existing Haskell ecosystem.
freer-simple - A friendly effect system for Haskell
fused-effects - A fast, flexible, fused effect system for Haskell
effect-zoo - Effect Zoo for Scala
frp-zoo - Comparing many FRP implementations by reimplementing the same toy app in each.
hackage-server - Hackage-Server: A Haskell Package Repository
in-other-words - A higher-order effect system where the sky's the limit
Truth - Changes and Pinafore projects. Pull requests not accepted.
polysemy - :gemini: higher-order, no-boilerplate monads
effect-zoo - Comparing Haskell effect systems for ergonomics and speed
extensible-effects - Extensible Effects: An Alternative to Monad Transformers