filter and report multiple predicates

Question

This is a kind of cosmetic Scala question. A list with objects needs to be filtered on the objects\' attributes. I need to report if the first check on the attribute results

Answer 1

The pattern matching works, the error of your code comes from the fact that you are trying to return _ in the second case, you may want to check here and here for why this could be a problem:

accounts.filter(_.id == 1) match {
       case List() => { println("error"); List() }
       case x => x.filter(_.balance > 1.0)
}
// res19: List[Account] = List(Account(1,5.0))


accounts.filter(_.id == 5) match {
       case List() => { println("error"); List() }
       case x => x.filter(_.balance > 1.0)
}
// error
// res20: List[Account] = List()