eff VS polysemy

Compare eff vs polysemy and see what are their differences.

eff

🚧 a work in progress effect system for Haskell 🚧 (by hasura)

polysemy

:gemini: higher-order, no-boilerplate monads (by polysemy-research)
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eff polysemy
18 7
546 1,025
0.0% 0.3%
0.0 6.0
about 1 year ago 1 day ago
Haskell Haskell
ISC 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.

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 2023-07-12.

polysemy

Posts with mentions or reviews of polysemy. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-06-02.
  • Functional Declarative Design: A Comprehensive Methodology for Statically-Typed Functional Programming Languages
    4 projects | /r/haskell | 2 Jun 2023
    Thirdly, composing arbitrary effects without losing state is really, really difficult. Things are fine when you limit yourself to State and Reader, sure, but once you start with nondeterminism you’ll discover it’s shockingly easy to produce behaviors that are baffling unless you’ve spent a preposterous amount of time thinking about this stuff. (I’ve been bitten in prod by silent state-dropping bugs, and rarely have I been more flummoxed.) Consider this example, which produces silent changes in the semantics of <|> depending on whether you use it inside or outside of a higher-order effect. Every single effect library (besides the still-unreleased eff) gets certain combinations of effects + nondeterminism wrong. You could make the argument that most people don’t use nondeterministic monads, but eDSLs really shine when you have access to them, as you can turn a concrete interpreter to an abstract one fairly easily.
  • Introduction to Doctests in Haskell
    6 projects | /r/haskell | 19 Apr 2022
    Looking for a few projects that make use of it, I found accelerate, hawk, polysemy and pretty-simple, so I'll be interested to poke around in their code and see how they have things set up.
  • ReaderT pattern is just extensible effects
    2 projects | /r/haskell | 3 Feb 2022
    Right, I think I'll just give it a shot to see. Polysemy is nice but I'm still having trouble getting what I want out of it (which may very well be entirely a fault of my own understanding)
  • 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.
  • Monthly Hask Anything (June 2021)
    16 projects | /r/haskell | 2 Jun 2021
  • Trouble Reinterpreting Higher Order Effects in PolySemy
    1 project | /r/haskell | 23 Apr 2021
    Looking at the interpreter for Reader might give some clues if this doesn't work. https://github.com/polysemy-research/polysemy/blob/master/src/Polysemy/Reader.hs#L38-L45
  • Structuring Code with ZIO &amp; ZLayers
    3 projects | /r/scala | 3 Mar 2021
    *But I'm not terribly well versed in Scala's other DI offerings. I came from Haskell and didn't find anything in Scala that clicked with me until I found ZIO. It reminded me a lot of my favorite way of writing Haskell programs (https://github.com/polysemy-research/polysemy)—albeit with a completely different implementation.

What are some alternatives?

When comparing eff and polysemy you can also consider the following projects:

freer-simple - A friendly effect system for Haskell

fused-effects - A fast, flexible, fused effect system for Haskell

purescript - A strongly-typed language that compiles to JavaScript

frp-zoo - Comparing many FRP implementations by reimplementing the same toy app in each.

in-other-words - A higher-order effect system where the sky's the limit

ast-monad - A library for constructing AST by using do-notation

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

Exercism - Scala Exercises - Crowd-sourced code mentorship. Practice having thoughtful conversations about code.

mtl-style-example - A small example of using mtl style to unit test effectful code

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).

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Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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