mbank8.scala

val (finalEntity, finalEvents) =
  commands.foldLeft((sampleAccount, List.empty[BankAccountEvent])) {
    case ((acc, events), cmd) =>
      val newEvents = acc.processCommand(cmd)
      val newAcc = newEvents.foldLeft(acc) {
        case (acc, evt) =>
          acc.processEvent(evt)
      }
      (newAcc, events ++ newEvents)
  }

println(show"Final state 1:\n${finalEntity.state}")

/* Output:
Final state 1:
Account holder: Ben Johnson
Balance: 80
*/