I wrote this for the book:
(defn index-filter [pred coll]
(when pred
(for [[idx elt] (indexed coll) :when (pred elt)] idx)))
and I keep finding myself needing it all over the place. Is there a
better idiom for finding *positions* of things in a sequence, rather
than the things themselves? If not, should I add this to contrib?
Stuart (H)
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