Scala is a functional, object-oriented programming language that runs on the JVM. Scala is suited for multi-threaded, multi-processor development because it is quite simple to pass immutable messages between threads.
Scala is different. Any is the base class of all objects. None represents null or the empty set. Nothing, Nil, Null, Some, Option are classes in Scala's API. Before investigating the API, let's just clarify a little syntax, the difference between val and var. vals are simply values - immutable. vars are variables. Two ways to declare fields with immutability as the obvious difference.
Other reserved words in the Scala syntax are: