Pattern matching over non-case class in Scala

Question

Lets assume that I have a plain third party (i.e. I cannot modify it) class defined like:

class Price(var value: Int)

Is this possible to m

Answer 1

You can create custom extractor:

package external {
    class Price(var value: Int)
}

object Price {
    def unapply(price: Price): Option[Int] = Some(price.value)
}

def printPrice(price: Price) = price match {
    case Price(v) if v <= 9000 => println(s"price is $v")
    case _ => println("price is over 9000")
}

printPrice(new Price(10))
printPrice(new Price(9001))

For case classes compiler generates it automaticaly. I think in your case extractors is overkill, but may be it's only simplified sample.