act.scala

override def act: Receive = {
    case Command("calc", operation :: args, message) if args.length >= 1 =>
      val op = possibleOperations.get(operation)

      val response = op.map(f => {
        val result = args.map(_.toDouble).reduceLeft( f(_,_) )
        OutboundMessage(message.channel, s"Results is: $result")
      }).getOrElse(OutboundMessage(message.channel, s"No operation $operation"))

      publish(response)

    case Command("calc", _, message) =>
      publish(OutboundMessage(message.channel, s"No arguments specified!"))
  }