Contents

trait BankAccount {

  def closeAccount(): Unit

  def getBalance: Option[Int]

  def incrementBalance(increment: Int): Option[Int]
}

protected case class Account(var balance: Option[Int] = Some(0)) extends BankAccount {

  private def runThreadSafe[A](block: => A): A = this.synchronized(block)

  override def closeAccount(): Unit = runThreadSafe(balance = None)

  override def getBalance: Option[Int] = runThreadSafe(balance)

  override def incrementBalance(increment: Int): Option[Int] = runThreadSafe {
    balance flatMap { amount =>
      balance = Some(amount + increment)
      balance
    }
  }
}

object Bank {
  def openAccount(): BankAccount = Account()
}

Version data entries

370 entries across 370 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.179	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.178	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.177	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.176	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.175	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.174	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.173	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.172	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.171	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.170	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.169	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.167	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.166	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.165	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.164	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.163	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.162	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.161	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.160	tracks/scala/exercises/bank-account/example.scala