On Mon, May 24, 2010 at 05:41, Drew Colthorp <dcolth...@gmail.com> wrote:
> A few weeks ago I announced a pattern matching library called
> matchure. I'm excited to say it's being merged into clojure.contrib as
> clojure.contrib.match. I'd like some feedback on ideas for some
> backward-incompatible changes I'm planning to make before it's
> actually pushed to clojure.contrib.
>
> In the discussion below, I'll use "matchure" when I'm speaking of the
> current behavior, and "clojure.contrib.match" when I'm describing
> proposed behavior of the library when it's merged in. See
> http://github.com/dcolthorp/matchure/blob/master/README.md for an
> introduction to matchure and the existing syntax, though I'll describe
> the relevant before and after behaviors below.
>
> Change 1: {:foo #"bar"} becomes {#"bar" :foo}
>
> In matchure, maps test against the values of corresponding keys. I'm
> going to change this so that the pattern is first and the key
> second. This makes the behavior closer to let, makes
> clojure.contrib.match more consistent in that patterns will always be
> to the left of the matched value, and patterns like {even? :foo} read
> better. This seems like an easy decision.
This strikes me as an odd change. Did you overlook the fact that map
keys have to be unique?
{even? :foo,
even? :bar}
Might read nicely, but will it work?
// Ben
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