Should not it be empty colection instead?
It seems odd to me since it is inconsistent and forces to consider one
more case (nil or collection).
And another question. I have written this function
(defn index-by
"Make map (f x) -> x"
[f coll]
(reduce #(assoc %1 (f %2) %2) {} coll))
I wonder, is there already such function somewhere in Clojure libraries?
--
Petr Gladkikh
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