maybe you should do this:
(defn add-author [book new-author]
(update-in book [:authors] conj new-author)
Thanks,
Di Xu
2014-10-29 19:01 GMT+08:00 Roelof Wobben <rwob...@hotmail.com>:
> 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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