Well, java.util.List specifies a retainAll(Collection c) method which is
basically the intersection between the 2 collections (the Collection
this is called on and the argument). You are actually looking for the
'difference' but if you have the intersection and the total it's pretty
trivial to find the difference.
alternatively, you can pour the lists into 2 clojure sets and take their
proper difference (but this will remove duplicates as well)...
I'm not sure what you mean 'compare those lists based on a key' though...
Jim
On 11/03/13 18:15, Ryan wrote:
Hello,
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.
Is there such a function in clojure? If not, what would be the most
elegant way to achieve it.
Thank you for your time
Ryan
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