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-2.2.1.98	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.97	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.96	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.95	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.94	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.93	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.92	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.91	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.90	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.89	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.88	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.87	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.86	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.85	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.84	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.83	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.82	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.81	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.80	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.79	tracks/scala/exercises/bank-account/example.scala