Bridget and Guru are both right about the reason that \3 is found at 
position 13 in the string. However, the code you typed isn't valid Clojure, 
since the pos function expects pred to be a function of v. Thus, your pos 
call would need to look like this:

(pos #(= % \3) ":a 4 :b 1 :c 3 :d 4") => (13)  ;; note that pos returns a 
list of all indeces matching pred

Alternatively, you could have defined pos to simply perform equality 
matching on its first argument like so:

(defn pos [val coll]
  (for [[i v] (index coll) :when (= val v)] i))

(pos \3 ":a 4 :b 1 :c 3 :d 4") => (13)

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