Nice! And with just a bit more, we have a clean, sorting DSL:
(def asc compare)
(def desc #(compare %2 %1))
;; compare-by generates a Comparator:
(defn compare-by [& key-cmp-pairs]
(fn [x y]
(loop [[k cmp & more] key-cmp-pairs]
(let [result (cmp (k x) (k y))]
(if (and (zero? result) more)
(recur more)
result)))))
(sort (compare-by :last-name asc, :date-of-birth desc) coll)
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