task.scala

task(2) {
  
  def isWorkingDay(day: String) = {
    var res: Boolean = false
    day match {
      case "Monday" =>
        res = true
      case "Tuesday" =>
        res = true
      case "Wednesday" =>
        res = true
      case "Thursday" =>
        res = true
      case "Friday" =>
        res = true
      case _ => 
    }
    res
  }
}