The performance of array iteration in cljs is not good compared vs. native
iteration on js array.
For example, I would like to sum all the members of on array.
I have tried (apply + arr) and (doseq ...). See below.
Is there a way to improve my code?
(def arr (range 20480))
(set! js/arr (clj->js arr))
(js/eval "function sum(arr) {
var total = 0,
i;
for (i = 0; i < arr.length; i++) {
total += arr[i];
}
return total;
}")
(defn my-sum[a]
(def res 0)
(doseq [x a]
(set! res (+ res x )))
res)
(time (js/sum js/arr)) ; less than 1 msec
(time (apply + arr)); around 10 msec
(time (my-sum arr)); around 10 msec
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