Yeah! Golf!
user=> (defn nil-coalesce
[coll replacements]
(lazy-seq
(when-let [s (seq coll)]
(let [fst (first s)]
(if (nil? fst)
(cons (first replacements)
(nil-coalesce (rest s) (rest replacements)))
(cons fst (nil-coalesce (rest s) replacements)))))))
#'user/nil-coalesce
user=> (nil-coalesce [nil 1 2 3 nil nil] [4 5])
(4 1 2 3 5 nil)
Sincerely
Meikel
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