This is the easiest way to swap the keys with the values in a hash-map.
(defn flip-map [m] (zipmap (vals m) (keys m))) #'user/flip-map user> (def m1 (apply hash-map (range 8))) #'user/m1 user> m1 {0 1, 2 3, 4 5, 6 7} user> (def m2 (flip-map m1)) #'user/m2 user> m2 {7 6, 5 4, 3 2, 1 0}
11.06.2013, 14:30, "Michael-Keith Bernard" <mkbernard....@gmail.com>:
An alternative implementation that shuffles all printable characters. This version returns the encryption map and generalizes the encrypt/decrypt functionality.https://gist.github.com/SegFaultAX/5754209
On Tuesday, August 12, 2008 10:25:00 PM UTC-7, Joubert Nel wrote:Hello,
I have a hash map, and want to derive another map from it but with the
key/value pairs swapped.
To do this, I wrote:
(def *reverseMap* (loop [result (hash-map)
keys (keys *myMap*)]
(if (== (count keys) 0)
result
(recur (merge result (hash-map (val (find *myMap* (first
keys)))
(first keys)))
(rest keys)))))
It works fine, but I suspect there is a better way.
Any suggestions?
Joubert--
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