doseq with index

[Răzvan Rotaru]

Hi,

Is there an elegant way to use a doseq or for and also get an index to use? I find myself using map-indexed in these cases, and I prefer more the for constructs.


(doall (map-indexed
        (fn [i x]
          ;do stuff with side effects using i and x
         )
        a-lazy-seq))


Cheers,
Razvan

[Sam Ritchie]

(doseq [[idx item] (map-indexed vector a-lazy-seq)]
   (do-stuff! item idx))

Răzvan Rotaru

June 22, 2014 at 1:50 PM

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[Mikera]

I found this to be fairly common pattern so I wrote a "doseq-indexed" macro, which is part of my clojure-utils library.

Source: https://github.com/mikera/clojure-utils/blob/master/src/main/clojure/mikera/cljutils/loops.clj

usage:

(doseq-indexed [x (some-sequence) i]

  ;; do things with x and i bound to the element and the index respectively  

)