Scala. Partial classes

Question

Is there any equivalents to C# partial classes in scala ? I would like to depart my functionality with objects like this:

// file 1:
object MainClass {
    def addValue(value: AnyRef) = ???
}

// file 2:
partial object MainClass {
    addValue(1)
}

// file 3:
partial object MainClass {
    addValue(2)
}  

// file 4: initialize MainClass
MainClass.init()

How can i achive this functionality with scala ?

Answer 1

The closest you can do is to divide your functionality into traits, and divide those across separate files:

// file 1:
class MainClass extends Functionality1, Functionality2

// file 2:
trait Functionality1 {
  self: MainClass =>
}

// file 3:
trait Functionality2 {
  self: MainClass =>
}

Note that by using the self-type and setting it to MainClass, you ensure that each trait can reference all the members that will eventually be mixed into the MainClass.