I am reading The Joy of Clojure now and am finishing chapter 5 on sequence 
abstractions. There is an example given that demonstrates how to locate the 
index of an element in a sequence by value, but I don't understand why the 
character lookup here is returning 13. Can somebody please explain this to 
me?

(defn index [coll]
>   (cond
>    (map? coll) (seq coll)
>    (set? coll) (map vector coll coll)
>    :else (map vector (iterate inc 0) coll)))
>
> (defn pos [pred coll]
>   (for [[i v] (index coll) :when (pred v)] i))
>
 

> (pos \3 ":a 4 :b 1 :c 3 :d 4")   

 

=> 13


J 

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