References
Scala reference
Combine object oriented and functional programming.
Scala Basics
Run a small program with an entry point.
Scala Functions as Values
Define a method and pass it to a higher-order function.
Scala Case Classes and Pattern Matching
Define a data class and take it apart with match.
Scala Collections: map and filter
Transform and filter an immutable List without loops.
Scala Maps and Option
Look up a key without nulls by using Option.