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 BankAccount {
  def apply(): BankAccount = Account()
}

Version data entries

26 entries across 26 versions & 1 rubygems

Version	Path
trackler-2.0.3.0	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.2.0	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.1.2	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.1.1	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.1.0	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.10	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.9	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.8	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.7	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.6	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.5	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.4	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.3	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.2	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.1	tracks/scala/exercises/bank-account/example.scala
trackler-2.0.0.0	tracks/scala/exercises/bank-account/example.scala
trackler-1.0.4.1	tracks/scala/exercises/bank-account/example.scala
trackler-1.0.4.0	tracks/scala/exercises/bank-account/example.scala
trackler-1.0.3.0	tracks/scala/exercises/bank-account/example.scala
trackler-1.0.2.1	tracks/scala/exercises/bank-account/example.scala