op.scala

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scala> import frdomain.ch3.repository._
import frdomain.ch3.repository._

scala> import reader._
import reader._

scala> val a = Account("a-123", "abc")
a: frdomain.ch3.repository.Account = Account(a-123,abc,Tue Apr 28 02:14:04 GMT+05:30 2015,None,Balance(0))

scala> val s = AccountRepositoryInMemory
s: frdomain.ch3.repository.AccountRepositoryInMemory.type = frdomain.ch3.repository.AccountRepositoryInMemory$@705b0bc4

scala> s.store(a)
res0: scala.util.Try[frdomain.ch3.repository.Account] = Success(Account(a-123,abc,Tue Apr 28 02:14:04 GMT+05:30 2015,None,Balance(0)))

scala> import AccountService._
import AccountService._

scala> object App {
     |   def op(no: String) = for {
     |     _ <- credit(no, BigDecimal(100))
     |     _ <- credit(no, BigDecimal(300))
     |     _ <- debit(no, BigDecimal(160))
     |     b <- balance(no)
     |   } yield b 
     | }
defined object App

scala> import App._
import App._

scala> op("a-123") run s
res2: scala.util.Try[frdomain.ch3.repository.Balance] = Success(Balance(240))

scala> op("a-143") run s
res3: scala.util.Try[frdomain.ch3.repository.Balance] = Failure(java.lang.Exception: No account exists with no a-143)

scala>