Scala Language Enumerations Days of the week using Scala Enumeration
Example
Java-like enumerations can be created by extending Enumeration.
object WeekDays extends Enumeration {
val Mon, Tue, Wed, Thu, Fri, Sat, Sun = Value
}
def isWeekend(day: WeekDays.Value): Boolean = day match {
case WeekDays.Sat | WeekDays.Sun => true
case _ => false
}
isWeekend(WeekDays.Sun)
res0: Boolean = true
It is also possible to add a human-readable name for values in an enumeration:
object WeekDays extends Enumeration {
val Mon = Value("Monday")
val Tue = Value("Tuesday")
val Wed = Value("Wednesday")
val Thu = Value("Thursday")
val Fri = Value("Friday")
val Sat = Value("Saturday")
val Sun = Value("Sunday")
}
println(WeekDays.Mon)
>> Monday
WeekDays.withName("Monday") == WeekDays.Mon
>> res0: Boolean = true
Beware of the not-so-typesafe behavior, wherein different enumerations can evaluate as the same instance type:
object Parity extends Enumeration {
val Even, Odd = Value
}
WeekDays.Mon.isInstanceOf[Parity.Value]
>> res1: Boolean = true
