Hello, 

For a exercise I have to add something to the end of a existing map. 

So I thought this would work : 

(defn add-author [book new-author]
  (assoc book (conj :authors new-author)))

and call the function with : 

(add-author little-schemer {:name "Gerald J. Sussman"})


then I see this error message : 


ClassCastException clojure.lang.Keyword cannot be cast to 
clojure.lang.IPersistentCollection  clojure.core/conj (core.clj:83) 


Roelof




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