gistfile1.txt

(defn followers-minus-friends [screenname]
  (let [difference-ids (difference (idset show-followers screenname)
                                   (idset show-friends screenname))
        x (swank.core/break)
        userinfos (userinfos difference-ids)]
    (map :screen_name userinfos)))

;; test:

(fact (followers-minus-friends ...name...) => ["Dude"]
      (provided (idset show-followers ...name...) => #{1 2 3}
                (idset show-friends ...name...) => #{1 2}
                (userinfos #{3}) => [{:screen_name "Dude"}]))