Programming-Idioms

Edit summary for version 23 by Naxels:
[Clojure] Putting the -1)) on the new line, enhances the readability by users of the (or path

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2021-03-26, 18:36:51

2021-08-08, 13:32:02

Idiom #222 Find first index of an element in list

Set i to the first index in list items at which the element x can be found, or -1 if items does not contain x.

Set i to the first index in list items at which the element x can be found, or -1 if items does not contain x.

i,x,items

i,x,items

position

position

(defn find-index [x items]
  (or (->> items
         (map-indexed vector)
         (filter #(= x (peek %)))
         ffirst) -1))

(defn find-index [x items]
  (or (->> items
           (map-indexed vector)
           (filter #(= x (peek %)))
           ffirst)
      -1))

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