Thank you all, I've learned something from each entry. My latest version,
incorporating some of the changes suggested:
(defn make-crypto []
(let [lower (map char (range (int \a) (inc (int \z))))
upper (map char (range (int \A) (inc (int \Z))))
digit (map char (range (int \0) (inc (int \9))))
[sl su sd] (map shuffle [lower upper digit])
encrypt (zipmap (concat lower upper digit)
(concat sl su sd))]
(fn [s]
(apply str (map #(encrypt % %) s)))))
I specified the range the way I did because I wanted meaningful start and
end points, I don't have the code points for many characters memorized.
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