Finds the first position of an item that matches a given predicate
within col. Returns nil if not found. Optionally provide a start
offset to search from.
Source
swank/util.clj:18
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(defn position
"Finds the first position of an item that matches a given predicate
within col. Returns nil if not found. Optionally provide a start
offset to search from."
([pred coll] (position pred coll 0))
([pred coll start]
(loop [coll (drop start coll), i start]
(when (seq coll)
(if (pred (first coll))
i
(recur (rest coll) (inc i))))))
{:tag Integer})
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