> (defn mash
> "Reduce a seq-able to a map. The given fn should return a 2-element tuple
> representing a key and value in the new map."
> [f coll]
> (reduce
> (fn [memo elem]
> (let [[k v] (f elem)]
> (assoc memo k v)))
> {} coll))
I called this "map-map" in my utilities. Mine was even a bit more
general, in that it could take multiple collections like "map". This
allowed you to say thinks like
(map-map vector s (iterate inc 0))
to get a map from elements of s to indices.
Then Chouser pointed out [1] that map-map is equivalent to just
(into {} (map f coll1 coll2 ...))
[1]
http://groups.google.com/group/clojure/browse_thread/thread/134642cc76de17f7/b93b74fa4a6806cd?hl=en&q=utilities&lnk=ol&;
I still kind of like map-map, although I'm not sure if it's really any
better than the idiom Chouser gave. YMMV, but I'm pretty sure the
consensus was that map-map didn't belong in core, or probably even
contrib.
-Jason
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