Start

• No primitive types, everything is an object
• No semicolon
• Object is a singleton
• Methods can be defined private or protected. If no modifer is given, method is public.
• No static methods

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

if/else-Constructs have a return value

for (i <- 1 to 10) println(i)

Implizites break

val iValue = 3
iValue match{
  case 1 => println("one")
  case _ => println("empty")
}

There are no static methods/vars in scala and singleton objects can't be constructed using a constructor with new.

object ScalaObject {
 
  val b = 5
 
  def test(a: Double) : Double = {
    3.* + b 
  }
}

Prerequisite: object and class have the same name and are defined in the same file. Companion objects can access their private variables. Singleton objects without companion clases are standalone objects.

Use a factory method for construction All passed parameters are a val-variable of the class Can be used for pattern matching Implement toString, hashCode, equals and have a copy method

case class Person (firstName : String, lastName : String, age : Int){

def isAdult : Boolean = if (age >= 18) true else false

}

http://www.scalatutorial.de/topic143.html