Does anyone here (intentionally) use Scala without an effects library such as Cats or ZIO? Or without going "full Haskell"?

• frameless

  9 869 8.1 Scala

  Expressive types for Spark.

  

Frameless is a nice way to grab some type safety back from Spark, and features opt-in Cats integration.

• Laminar

  26 712 8.3 Scala

  Simple, expressive, and safe UI library for Scala.js (by raquo)

On the frontend, I use my own Laminar with observables that don't care about purity or tracking effects, and no Cats or Futures or anything else.

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• Http4s

  24 2,509 9.8 Scala

  A minimal, idiomatic Scala interface for HTTP

  

On the backend, I use http4s with Cats Effect, but I don't think in terms of purity or category theory, I just use IO as a nicer Future.

• ocaps

  2 17 0.0 JavaScript

  Object capability (ocap) tools and macros for Scala.

  

I agree absolutely. There are cases where using an effects library is the best thing you can do. I've written an object capabilities library in Scala, and it's a much nicer experience to use capabilities with cats-effect than doing it raw.

• cats-effect

  34 1,954 9.7 Scala

  The pure asynchronous runtime for Scala

  

Akka-stream, zio, and cats-effect all have very simple ways to do this by just passing an Int that specifies the parallelism at the call-site. Akka-stream has mapAsync. ZIO has mapMPar(f:A=%3Ezio.ZIO[R1,E1,B]):zio.stream.ZStream[R1,E1,B]), foreachPar, etc. Cats has parSequenceN and parTraverseN.

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