http://www.perlmonks.org?node_id=919435


in reply to Difference between two arrays - is there a better way?

Your initial solution relies on users not appearing twice in a list. And that there's no user listed only in the disabled users. I very much prefer the solution of your coworker, which does not rely on these dependencies.

And if you insist on a map/grep solution: 

my %disabled = map {($_, 1)} @list2;
my @active = grep {!$disabled{$_}} @list1;

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This solution doesn't rely on the dependencies mentioned above either.

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Re^2: Difference between two arrays - is there a better way?
by blindluke (Hermit) on Aug 09, 2011 at 09:36 UTC

    Thanks.

    Both dependencies will always be met in this particular case - as I mentioned, this was not a general problem.

    Still, I also prefer the second solution - it's not only more general than mine, but looks better, and seems more simple/elegant (although the aesthetic argument may not be as valid as the one you mentioned - that it is more general).

    I was simply wondering about other ways, in the spirit of TMTOWTDI. Thank you, and thanks to BrowserUk for both other solutions.

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