How make implicit Ordered on java.time.LocalDate

Question

I want to use java.time.LocalDate and java.time.LocalDateTime with an implicit Ordered like:

val date1 = java.time.Loc         


        

Answer 1

You can use Ordering.by to create ordering for any type, given a function from that type to something that already has an Ordering - in this case, to Long:

implicit val localDateOrdering: Ordering[LocalDate] = Ordering.by(_.toEpochDay)