> The obvious way is like the following, which traverse the sequence 2 times.
> Wondering what will be the efficient way...
(defn avg [coll]
(loop [c coll tot 0 cnt 0]
(if (empty? c)
(/ tot cnt)
(recur (rest c) (+ tot (first c)) (inc cnt)))))
This will loop only once.
It happens to be faster, but the difference is not explained by (count
coll) elimination only. Maybe reduce is a factor as well.
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