use trait to compose

fromScalaConsole.scala

case class Account(userId:String, money: Int)

trait Converter {
  def convert(number:Int):Int = number
}

trait Add10Converter extends Converter {
  override def convert(number:Int) = super.convert(2*number)
}

trait SquareConverter extends Converter {
  override def convert(number:Int) = super.convert(10 + number)
}

trait NegativeConverter extends Converter {
  override def convert(number:Int) = super.convert(-1 * number)
}

object Mod0 extends SquareConverter with Add10Converter with NegativeConverter {
  
}

object Mod1 extends Add10Converter with NegativeConverter with SquareConverter {
  
}

object Mod2 extends  NegativeConverter with Add10Converter with SquareConverter {
  
}

def convert(i:Int):Int = {


  i%3 match {
    case 0 => Mod0.convert(i)
    case 1 => Mod1.convert(i)
    case 2 => Mod2.convert(i)
  }


}