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(ns clojure.examples.example
(:gen-class))
(defn Example []
(def x (atom 0))
(add-watch x :watcher
(fn [key atom old-state new-state]
(println "The value of the atom has been changed")
(println "old-state" old-state)
(println "new-state" new-state)))
(reset! x 2))
(Example)
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