> I have two lists which contain java objects of the same class. I am trying
> to find out if there is a clojure function which i can use to compare those
> lists based on a key and return the objects from list A that do not exist
> in list B.
>
Lists as in Clojure lists, or as in java.util.Lists?
Anyway, since you apparently need your own equality function (can't rely on
Object#equals), you'll have to build more structures. Make a function that
extract the key from the entire object, say *key-fn*, and then do
(apply dissoc (into {} (map #(-> [(key-fn %) %] list-a))) (map key-fn
list-b))
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