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Scala Enumerations


Days of the week using Scala Enumeration

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
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")
>> 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
>> res1: Boolean = true


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