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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