y is 6 afraid of 7

fears.scala

// A scala exercise based on the http://thedet.wordpress.com/2012/04/25/y-is-6-afraidof-7/ blog entry
// The goal is to remove the parenthesis 

case class Fears(value:Int) {

  var s: String = "... Wait! %d has no fears!".format(value)

  def afraid(f: Fears) = {
    if (value == 6)
      f.s = s + f.s
    else
      f.s = s
    f
  }

  def of(n: Int = value) = n match {
      case 7 => " " + (7 to 9).toList.map(_.toString).reduce(_+" "+_)
      case _ => "... Wait! There's nothing to fear!"
  }

  def afraid_of(f: Fears) = {
    f.s = of(f.value)
    afraid(f)
  }

  override def toString() = s

}

def of(f: Fears) = {
  f.s = f.of()
  f
}

implicit def numbersFears(n: Int) = new Fears(n)


object Y {
  def is(f: Fears) = {
    f.s = f.value match {
      case 6 => "because"
      case _ => "wrong question"
    }
    f
  }
}