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CampingScorpion/gist:4134522

Created November 23, 2012 08:27
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doseq-indexed
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gistfile1.clj
;; Example:
;; (doseq-indexed idx [name names]
;; (println (str idx ". " name)
(defmacro doseq-indexed [index-sym [item-sym coll] & body]
`(let [idx-atom# (atom 0)]
(doseq [~item-sym ~coll]
(let [~index-sym (deref idx-atom#)]
~@body
(swap! idx-atom# inc)))))
@CampingScorpion
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Author

A lot better:

(defmacro doseq-indexed [index-sym [item-sym coll] & body]
  `(doseq [[~index-sym ~item-sym] (map list (range) ~coll)]
     ~@body))

@viebel
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viebel commented May 9, 2016

A live version of this gist: http://blog.klipse.tech/clojure/2016/05/09/macro-tutorial-4.html

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