Another approach, preserving the order of list-a, would be
(remove (comp (into #{} (map key-fn list-b)) key-fn) list-a)
On Monday, March 11, 2013 10:01:09 PM UTC+1, Marko Topolnik wrote:
>
>
> 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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