On Nov 21, 11:40 am, samppi <[EMAIL PROTECTED]> wrote:
> 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. :)
>
There's a difference between supporting key and val and allowing you
to create MapEntries directly. key and val will stick around.
Rich
> 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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