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-2.2.1.119	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.118	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.117	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.116	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.115	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.114	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.113	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.111	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.110	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.109	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.108	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.107	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.106	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.105	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.104	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.103	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.102	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.101	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.100	tracks/scala/exercises/bank-account/example.scala
trackler-2.2.1.99	tracks/scala/exercises/bank-account/example.scala