A symmetric solution is probably better, but indexing letters but a number just called out to me for an array, even if the characters need to be converted to numbers to do so...
(def e {\a 1 \e 2 \i 3 \o 4 \u 5}) (def d [\a\e\i\o\u]) (defn encode [s] (apply str (map #(get e % %) s))) (defn decode [s] (apply str (map #(get d (- (int %) (int \1)) %) s)))
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A symmetric solution is probably better, but indexing letters but a number just called out to me for an array, even if the characters need to be converted to numbers to do so...