Can extractors be customized with parameters in the body of a case statement (or anywhere else that an extractor would be used)?

Question

Basically, I would like to be able to build a custom extractor without having to store it in a variable prior to using it.

This isn\'t a real example of how I would

Answer 1

One can customize extractors to certain extent using implicit parameters, like this:

object SomeExtractorBuilder {
  def unapply(s: String)(implicit arg: Boolean): Option[String] = if (arg) Some(s) else None
}

implicit val arg: Boolean = true
"x" match {
  case SomeExtractorBuilder(result) =>
    result
}

Unfortunately this cannot be used when you want to use different variants in one match, as all case statements are in the same scope. Still, it can be useful sometimes.