Howdy David & Co.,
One of the *really* nice things about Scala's pattern matching is the
ability to extend pattern matching using extractors. The research is
presented in
http://lampwww.epfl.ch/~emir/written/MatchingObjectsWithPatterns-TR.pdf
The practical aspects allow testing and transforming at pattern matching
time. For example:
object AsInt {
def unapply(in: String): Option[Int] = try {Some(in.toInt)} catch {case
e: Exception => None}
}
foo match {
case AsInt(number) => number + 1
case _ => 0
}
More importantly, one can use extractors to test external things:
object AsJsonFile {
def unapply(fileName: String): Option[JSON] = ... // find the file, load
it and parse it as JSON
}
What are your thoughts on adding extractors to the pattern matcher?
Thanks,
David
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