Scala Programming Language Intro

• Scala stands for "scalable language" and is a general-purpose programming language providing support for functional programming (multi-paradigm)
• also object-oriented
• Designed to be concise
• Scala is the 25th most popular programming language in February 2020 according to the TIOBE index
• License: Apache License 2.0
• File extensions: .scala, .sc
• First appeared January 20, 2004
• Hello World example:

 object HelloWorld extends App {
   println("Hello, World!")
 }

• Compile with:

$ scalac HelloWorld.scala

• Runs with:

$ scala HelloWorld

• var keyword: mutable variable

var myVar : String = "Foo"

• val keyword: immutable variable

val myVal : String = "Foo"

• Syntax for variable:

val or val VariableName : DataType = [Initial Value]