Yes, thank you—(key) and (val) were what I was interested in, so I'll
use the latter function you gave. What I'm wondering though is, if
MapEntries aren't guaranteed for the future, what is being planned for
(key) and (val) too. Oh, well. :)
On Nov 21, 8:23 am, "J. McConnell" <[EMAIL PROTECTED]> wrote:
> On Fri, Nov 21, 2008 at 12:03 AM, samppi <[EMAIL PROTECTED]> wrote:
>
> > Is it possible to create a MapEntry from scratch? The reason why I'm
> > asking is because I want to mess with sequences of two-sized vectors,
> > and it would be really cool if I could use the key and val functions
> > on them rather than (get % 0) and (get % 1):
>
> > (map #(str "Key:" (key %) "Value:" (val %)) [(map-entry :a 3) (map-
> > entry :b 2) (map-entry :a 1) (map-entry :c 0)])
>
> Since Rich discouraged use of the MapEntry class, here are a couple of
> options.
>
> First, one thing worth remembering is that vectors are functions of
> their indexes, so you can do this and get rid of the "get"'s:
>
> (map #(str "Key: " (% 0) "Value: " (% 1)) [[:a 3] [:b 2] [:a 1] [:c 0]])
>
> Second, if it was the use of (key) and (val) that you were most
> interested in, you could create your own (map-entry) function:
>
> user=> (defn map-entry [k v] (first {k v}))
> #'user/map-entry
> user=> (map #(str "Key:" (key %) "Value:" (val %))
> [(map-entry :a 3) (map-entry :b 2) (map-entry :a 1) (map-entry :c 0)])
> ("Key::aValue:3" "Key::bValue:2" "Key::aValue:1" "Key::cValue:0")
>
> HTH,
>
> - J.
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