scastie VS sbt

From personal experience Scala also works. It's 100% possible to learn monads using https://scastie.scala-lang.org/ as a scratch pad.

Instead I typically use https://scastie.scala-lang.org, or an ammonite script, or just create a new file that extends App in my test directory. The thing that worksheets do better is that you can import things from your project (like the little app in the test dir) but they also show runtime values (like repl or scastie). However I've just never gotten them to actually work.

I strongly recommend you play around with the local Scala REPL. I have Scala 2.13 on my main dev computer and Scala 3 on my other computer. The local REPL will let you know when things are deprecated and give you hints as to what you should use instead. Scastie https://scastie.scala-lang.org/ can also be a big help.

Operationally, as you might expect from a language borne from academia, Scala tooling can be problematic and compilation can be slow--particularly if you are not yet using Scala 3, which only recently emerged and is very slowly percolating through the ecosystem (Remember the Python 2 to Python 3 transition?). But type inference, a vast standard library, and the time-tested reliability of the JVM make you very productive once you get the hang of them. Performance varies with the JVM you're running, but regardless you do have to contend with the size of compiled objects and the latency of garbage collection at runtime. When you want to experiment, you can skip the ceremony of writing a class or test and instead use a command-line REPL, an online REPL called Scastie you can share, or an outstanding third-party command-line REPL called Ammonite. Dependency management is achieved with SBT typically but also more general JVM build tools like Gradle and Maven.

I am using https://scastie.scala-lang.org/ which does compile server side in Scala. The UI is a bit hard to handle tho.

https://github.com/scalacenter/scastie#how-do-i-embed-scastie

NOTE: I won’t mention SBT and Leiningen here because, with all due respect, they are niche build tools. I also won’t discuss Kobalt for the same reason (besides, it’s no longer actively maintained). Additionally, I won’t touch upon Bazel and Buck in this context, mainly because I’m not very familiar with them. If you have insights or comments about these tools, please feel free to share them in the comments 👇

Sbt has the primitives that would allow that, but this would change the semantics of the test task. See also testQuick and https://github.com/sbt/sbt/issues/6292

If I use IntelliJ then apparently sbtn is not supported and they don't bother with Scala-CLI or Coursier.

Version 1.3.13 has a size of 1.17 MB in zip

See scala-xml 2.x mega tracker on plugin ecosystem conflicts.

This is under discussion at https://github.com/sbt/sbt/issues/6997

See https://github.com/playframework/playframework/issues/10572 and https://github.com/sbt/sbt/issues/6235 for more details and context.

BTW, if you're curious, it appears OP is using this: https://github.com/sbt/sbt/releases/tag/v1.6.2 Pretty sure one of the executables is doing ANSI colours.

If you see the progression of documentation changes over the years pushing people towards multi-project style, and issues like https://github.com/sbt/sbt/issues/6217, hopefully you'd see that I've really tried to encourage people to use multi-project style from the get go.

Fyi in case anyone is curious, sbt is fully removing log4j going forward: https://github.com/sbt/sbt/pull/6726