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Alex Rivera
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I tried to create an unapply method to use in pattern matching, and I tried to make it return something different than Option , however, Eclipse shows that as an error. Is it a rule that unapply must return an Option[T] ? EDIT: here's the code I'm trying to use. I switched the code from the previous section so that unapply returns a Boolean import java.util.regex._ object NumberMatcher { def apply(x:String):Boolean = { val pat = Pattern.compile("\\d+") val matcher = pat.matcher(x) return matcher.find } def unapply(x:String):Boolean = { val pat = Pattern.compile("\\d+") val matcher = pat.matcher(x) return matcher.find } } object x { def main(args : Array[String]) : Unit = { val strings = List("geo12","neo493","leo") for(val str <- strings) { str match { case NumberMatcher(group) => println(group) case _ => println ("no") } } } } Eclipse says wrong number of arguments for object NumberMatcher . Why is that?
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