Scala

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Scala is an object-functional programming and scripting language for general software applications. Scala has full support for functional programming (including currying, pattern matching, algebraic data types, lazy evaluation, tail recursion, immutability, etc.) and a very strong static type system. This allows programs written in Scala to be very concise and thus smaller in size than most general purpose programming languages. Many of Scala's design decisions were inspired by criticism over the shortcomings of Java.

Installation

Install the scala package available in the official repositories. Additionally you can install the packages scala-docs and/or scala-sources for further reference.

Since Scala runs on the JVM (Java Virtual Machine), you will need a fully functional Java Runtime Environment (JRE) in order to execute or compile your programs.

For scala3 (which is also known as dotty), you can install scala3AUR or scala-dottyAUR from AUR. Note that scala3 is incompatible with scala 2.13 or older.

Build tools

Most build tools are available in the official community repository:

Usage and IDEs

Just as in other programming languages like Python, you can interact with an interpreter 

$ scala

Welcome to Scala version 2.*.* (OpenJDK Server VM, Java 1.*.*).
Type in expressions to have them evaluated.
Type :help for more information.

scala>

as well as simply compile and run your programs from the command line. 

$ scalac HelloWorld.scala
$ scala HelloWorld

Many different IDEs such as Eclipse or Netbeans offer support for Scala. The scala-ideAUR package for example is available in the AUR. But you can also download an IDE that is optimized for Scala and also based on Eclipse directly from the official Scala Website. ammonite is an alternative REPL available in the official community repository offering features like syntax highlighting, multi-line editing, the ability to load maven artifacts directly in the REPL, and many other quality-of-life improvements missing in the default Scala REPL.

See also