Clojure itself is being pragmatic about many many things... If you want
removeAll() then use it...what can be better than a single method call?
mind you though, what Andy said applies here. It depends what you want
to compare for...you want to do a 'deep' comparison (per =) or fall back
to java's broken equality semantics? If you use removeAll() you
automatically lose the ability to make such decisions for yourself... :-)
Jim
On 11/03/13 19:35, Ryan wrote:
Hey Jim,
Thanks for your replies for starters.
Indeed I do not care what will happen to the original lists, i only
care to find out which objects from list A do not exist in list B.
Ignore the key part.
I was aware of the functionality which is provided by java.util.List
but I was hoping for a more clojurish way instead of calling java methods.
or is it pointless and I should just use removeAll()?
Ryan
On Monday, March 11, 2013 8:49:45 PM UTC+2, Jim foo.bar wrote:
On 11/03/13 18:35, Jim - FooBar(); wrote:
> 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.
actually there is a removeAll(Collection c) which will
(destructively)
give you exactly what you want...I guess that would be the fastest
way
if you don't care about what happens to list A...
hope that helps,
Jim
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