Scala.js VS ZIO

Compare Scala.js vs ZIO and see what are their differences.

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Scala.js ZIO
33 59
4,522 3,980
0.3% 0.8%
9.0 9.5
8 days ago 2 days ago
Scala Scala
Apache License 2.0 Apache License 2.0
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.

Scala.js

Posts with mentions or reviews of Scala.js. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-07-01.

ZIO

Posts with mentions or reviews of ZIO. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-01-11.
  • The golden age of Kotlin and its uncertain future
    4 projects | news.ycombinator.com | 11 Jan 2024
  • I had a great experience with Scala and hopefully it will get more popular
    10 projects | /r/scala | 11 Jul 2023
    scala has 2 healthy and pretty complete lib ecosystems : check out typelevel and ZIO. Both are FP oriented, which might not be your cup of tea at first glance but I would encourage you to try em out ! Softest introduction would be to start with the typelevel cats library and build up from there. The excellent Scala with Cats will ease you softly into an FP mindset. It's a bit dated and for scala 2 only but translating to Scala 3 is a very good exercise if you feel so inclined !
  • Is it prudent to use Scala for anything new?
    2 projects | news.ycombinator.com | 14 Jun 2023
    Last but not least, Scala is currently the language with one of the best effect systems in my opinion (https://zio.dev/). Kotlin for example has copied the approach with https://arrow-kt.io/ which I think is great actually. But when comparing Scala and Kotlin here, Scala wins by a large margin, it is a completely different world. It's like building a highly concurrent system in Erlang vs C.

    Of course, if you don't want to learn things like union types, traits/typeclasses and effects (similar to async/await but more powerful) you will be annoyed by Scala. But once you learned them, you can never go back.

  • How to get started?
    4 projects | /r/scala | 2 Jun 2023
    ZIO
  • Reconnecting with Scala. What's new?
    7 projects | /r/scala | 24 May 2023
    Links: - https://dotty.epfl.ch/ - https://scala-native.org/en/stable/ - https://www.scala-js.org/ - https://typelevel.org/ - https://zio.dev/ - https://github.com/scala-native/scala-native/pull/3120 - https://github.com/lampepfl/dotty/pull/16517 - https://dotty.epfl.ch/docs/reference/experimental/index.html - https://scala-cli.virtuslab.org/ - https://scalameta.org/metals/ - https://docs.scala-lang.org/scala3/guides/migration/compatibility-intro.html - https://www.scala-lang.org/blog/2023/04/18/faster-scalajs-development-with-frontend-tooling.html - https://www.scala-lang.org/blog/2022/08/17/long-term-compatibility-plans.html
  • Is Parallel Programming Hard, and, If So, What Can You Do About It? [pdf]
    4 projects | news.ycombinator.com | 19 Feb 2023
    I use ZIO (http://zio.dev) for Scala which makes parallel programming trivial.

    Wraps different styles of asynchronicity e.g. callbacks, futures, fibers into one coherent model. And has excellent resource management so you can be sure that when you are forking a task that it will always clean up after itself.

    Have yet to see anything that comes close whilst still being practical i.e. you can leverage the very large ecosystem of Java libraries.

  • 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.
  • What’s so great about functional programming anyway?
    8 projects | news.ycombinator.com | 16 Nov 2022
    > It's a weakness of functional programming, not the language.

    I would strongly object this.

    Have you seen ZIO?

    https://zio.dev/

  • Switching career from F# to scala
    2 projects | /r/scala | 24 Oct 2022
    But overall, I'm happier with Scala. It has not one, but two lively FP communities. I recommend that you pick one of them: ZIO or TypeLevel (Cats Effect, fs2, http4s, ...). To some extent, you can mix TypeLevel libraries in ZIO projects.
  • New to Scala;
    8 projects | /r/scala | 14 Oct 2022

What are some alternatives?

When comparing Scala.js and ZIO you can also consider the following projects:

cats-effect - The pure asynchronous runtime for Scala

Monix - Asynchronous, Reactive Programming for Scala and Scala.js.

Http4s - A minimal, idiomatic Scala interface for HTTP

Vert.x - Vert.x is a tool-kit for building reactive applications on the JVM

cats - Lightweight, modular, and extensible library for functional programming.

fs2-kafka - Functional Kafka Streams for Scala

Reactor-Scala-Extensions - A scala extension for Project Reactor's Flux and Mono

Scala.Rx - An experimental library for Functional Reactive Programming in Scala

RxScala - RxScala – Reactive Extensions for Scala – a library for composing asynchronous and event-based programs using observable sequences

scalajs-react - Facebook's React on Scala.JS

Laminar - Simple, expressive, and safe UI library for Scala.js