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Example smart constructor in Scala: DayOfWeek.scala post this code
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sealed trait DayOfWeek { val value: Int /* * Core Abstraction */ override def toString = value match { case 1 => "Monday" case 2 => "Tuesday" case 3 => "Wednesday" case 4 => "Thursday" case 5 => "Friday" case 6 => "Saturday" case 7 => "Sunday" } } /* * The companion object or the module */ object DayOfWeek { private def unsafeDayOfWeek(d: Int) = new DayOfWeek { val value = d } private val isValid: Int => Boolean = { i => i >= 1 && i