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
--
Telegram, Simply Beautiful CMS https://telegr.am
Lift, the simply functional web framework http://liftweb.net
Follow me: http://twitter.com/dpp
Blog: http://goodstuff.im
--
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/groups/opt_out.
