I mentioned the FAQ because the only meaningful interpretation of "intersection" of two hashes is the intersection of their keys, which leads back to determining the intersection of two lists. I would code the loop a bit differently:

my @intersection = grep { exists $hash2{$_} } keys %hash1;
my %intersection;
@intersection{ @intersection } = @hash1{ @intersection };

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Update: I made an error and had my %intersection where I should have assigned a hash slice instead. Fixed, thanks to ysth!

Update 2: Fixed a syntax error - you can't declare a hash slice via my. Spotted again by ysth!

In reply to Re^3: Intersect two hashes by Corion
in thread Intersect two hashes by HarshaHegde

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