How do I find the index of an item in a vector?

Question

Any ideas what ???? should be? Is there a built in? What would be the best way to accomplish this task?

(def v [\"one\" \"two\" \"three\" \"two         


        

Answer 1

I'd go with reduce-kv

(defn find-index [pred vec]
  (reduce-kv
    (fn [_ k v]
      (if (pred v)
        (reduced k)))
    nil
    vec))