I posted because clojure *tends* to be so succinct and in this case
the solution complexity seems disproportionate to the problem. In my
first post I forgot to mention my second attempt...
(map #(if (nil? %1) %2 %1) [nil 1 2 3 nil nil] [4 5])
but it got ugly because I needed to extend the replacements to the the
same length as the maybe-nil collection...
(defn nil-coalesce2 [maybe-nil replacements]
(let [cnt-mn (count maybe-nil)
cnt-r (count replacements)]
(if (= cnt-mn cnt-r)
(map #(if (nil? %1) %2 %1) maybe-nil replacements)
(map #(if (nil? %1) %2 %1) maybe-nil (concat replacements (repeat
(- cnt-mn cnt-r) nil))))))
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