Cats-effect Alternatives

cats-effect reviews and mentions

• A question about Http4s new major version
  3 projects | /r/scala | 25 Apr 2023

  Those benchmarks are using a snapshot version of cats-effect. I don't know where that one comes from, but previously they were using a snapshot from https://github.com/typelevel/cats-effect/pull/3332 which had some issues (3.5-6581dc4, 70% performance degradation), which have since been resolved (see that PR for more info and comparative benchmarks).

• The Great Concurrency Smackdown: ZIO versus JDK by John A. De Goes
  3 projects | /r/scala | 18 Feb 2023

  Recently, CE3 has had similar issues reported across multiple repositories, almost an epidemic of reports!

• 40x Faster! We rewrote our project with Rust!
  5 projects | /r/rust | 30 Jan 2023

  The one advantage Rust has over Scala is that it detects data races at compile time, and that's a big time saver if you use low level thread synchronization. However, if you write pure FP code with ZIO or Cats Effect that's basically a non-issue anyway.

• Sequential application of a constructor?
  2 projects | /r/scala | 21 Jan 2023

  See also cats-effect and fs2. cats-effect gives you your IO Monad (and IOApp to run it with on supported platforms). fs2 is the ecosystem’s streaming library, which is much more pervasive in functional Scala than in Haskell. For example, http4s and Doobie are both based on fs2.

• Should I Move From PHP to Node/Express?
  13 projects | /r/node | 13 Oct 2022

  On the contrary, switching to the functional mindset, with something like Typelevel Scala3 and respective cats and cats-effect fs2 frameworks, helps to rethink a lot of designs and development approaches.

• Next Steps for Rust in the Kernel
  8 projects | news.ycombinator.com | 21 Sep 2022

  I think "better Haskell on JVM" (in contrast to "worse Haskell") is a good identity for Scala to have. (Please note that this is an intentional hyperbole.)

  Of course, there are areas where Haskell is stronger than Scala (hint: modularity, crucial for good Software Engineering, is not one of them). And Scala has its own way of doing things, so just imitating Haskell won't work well.

  Examples of this "better Haskell" are https://typelevel.org/cats-effect/ and https://zio.dev/ .

  All together, Scala may be a better choice for you if you want to do Pure Functional Programming. And is definitely less risky (runs on JVM, Java libraries interop, IntelliJ, easy debugging, etc...).

  None of the other languages you mentioned are viable in this sense (if also you want a powerful type system, which rules out Clojure).

  I agree that Rust's identity is pretty clear: a modern language for use cases where only C or C++ could have been used before.

• Java 19 Is Out
  4 projects | news.ycombinator.com | 20 Sep 2022

  I would use Scala. I like FP and Scala comes with some awesome libraries for concurrent/async programming like Cats Effect or ZIO. Good choice for creating modern style micro-services to be run in the cloud (or even macro-services, Scala has a powerful module system, so it's made to handle large codebases).

  https://typelevel.org/cats-effect/

  https://zio.dev/

  The language, the community and customs are great. You don't have to worry about nulls, things are immutable by default, domain modelling with ADTs and patter matching is pure joy.

  The tooling available is from good to great and Scala is big enough that there are good libraries for typical if not vast majority of stuff and Java libs as a reliable fallback.

• Scala isn't fun anymore
  10 projects | /r/programming | 10 Sep 2022

  The author is the creator of Monix and implemented the first version of cats-effect. He knows what he is doing.

• Question about some advanced types
  3 projects | /r/scala | 5 Sep 2022

  You want Kernmantle, which quite honestly shouldn't be hard to implement around Cats and cats-effect. In particular, although Kernmantle doesn't require the use of the Arrow typeclass, there happen to be Arrow (actually ArrowChoice) instances for both Function1 from the standard library and Kleisli from Cats itself, given a Monad instance for the Kleilsi's F[_] type parameter. In other words, we should be able to port Kernmantle from Haskell to Scala (with the Typelevel ecosystem) and instantly be able to use pretty much anything else from the Typelevel ecosystem, or wrapped with it, in our workflow graphs. Pure functions, monadic functions, applicative functions, GADTs with hand-written interpreters, any of it. I think this would be eminently worth doing.

• A Python-compatible statically typed language erg-lang/erg
  27 projects | news.ycombinator.com | 13 Aug 2022
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