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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