Another one that works with all collections. Short, but not
necessarily the most efficient:

(use '[clojure.contrib.seq-utils :only [positions]])

(defn nil-coalesce [coll subs]
  (map-indexed (zipmap (positions nil? coll) subs) coll))

Justin

On Aug 17, 4:10 pm, Justin Kramer <jkkra...@gmail.com> wrote:
> With the precondition that the first collection is a vector:
>
> (use '[clojure.contrib.seq-utils :only [positions]])
>
> (defn nil-coalesce [v subs]
>   (apply assoc v (interleave (positions nil? v) subs)))
>
> Justin

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