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How do I compute the difference of two arrays? How do I compute the intersection of two arrays?by faq_monk (Initiate) |
on Oct 08, 1999 at 00:20 UTC ( [id://611]=perlfaq nodetype: print w/replies, xml ) | Need Help?? |
Current Perl documentation can be found at perldoc.perl.org. Here is our local, out-dated (pre-5.6) version: Use a hash. Here's code to do both and more. It assumes that each element is unique in a given array:
@union = @intersection = @difference = (); %count = (); foreach $element (@array1, @array2) { $count{$element}++ } foreach $element (keys %count) { push @union, $element; push @{ $count{$element} > 1 ? \@intersection : \@difference }, $element; }
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