(defn index-filter [pred coll]
(when pred
(for [[idx elt] (indexed coll) :when (pred elt)] idx)))
(index-filter #{\a \b} "abcdef")
-> (0 1)
but I don't know why use "when pred" in the code,
and why "(index-filter {\a \b} "abcdef")" doesn't work?
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