Scala (Generalities)

Main Features of Scala

• All types are objects
• Type inference
• Nested Functions
• Functions are objects
• Domain specific language (DSL) support
• Traits
• Closures
• Concurrency support inspired by Erlang

Tools and Frameworks

REPL https://ammonite.io/

https://scalafiddle.io/

• The Lift Framework
• The Play framework
• The Bowler framework
• Akka

https://typelevel.org/

Install

• Need to have Java Software Development Kit (SDK) installed

java -version

export JAVA_HOME=/usr/local/java-current
export PATH=$PATH:$JAVA_HOME/bin/

https://www.scala-lang.org/download/

Compilation

scalac HelloWorld.scala  // produces HelloWorld.class
scala -classpath . HelloWorld

Scala 3 Updates

• Indentation-based syntax: Similar to Python.
• Enums: First-class support for algebraic data types.
• Extension Methods: Easier way to add methods to existing types.
• Given Instances and Using Clauses: Replacement for implicits.