try_example8

try_example8.scala

object Program {
  def apply(): Program = new Program()
}
 
trait Program {
def collectData(): Try[List[Data]] = {
  val data = dataGetter()
  if(data.length < 1)
    throw new DataException("Data Collection Fails")
  else
    data
}

val results: Int = {
  val program = Program()
  for {
    data <- program.collectData()
    results <- data.sumBy(i => i.value
  } yield results
}