Cool, thank you.
On Thu, Aug 30, 2018 at 11:38 AM, Sam Tobin-Hochstadt <sa...@cs.indiana.edu>
wrote:
> No, there isn't something here that you're missing. An addition here
> would probably be useful, though -- you might take a look at how
> Clojure does this, since they pattern match on a lot of dictionaries.
>
> Sam
> On Thu, Aug 30, 2018 at 11:36 AM David Storrs <david.sto...@gmail.com>
> wrote:
> >
> > I'd like to be able to write something like this:
> >
> > (match (hash 'a 1 'b 2)
> > [(hash-table ('a a) ('b b) ('c c)) (list a b c)])
> >
> > ...except with something that says "if 'c isn't present, that's fine.
> Use this value instead."
> >
> > I've gone through the page on pattern matching and been unable to find
> anything. I've tried various things with #:when but that doesn't seem to
> do what I need -- it only controls whether the match succeeds or fails.
> >
> > I could write multiple clauses or do the defaulting before the match,
> but that's a lot of bother and it feels like there should be a more elegant
> solution. Have I missed anything?
> >
> >
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