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Are you looking for different keys, keys/value pairs or both?

One option is iterate through both hashes in-sync (much like the "merge" step in a mergesort) and spit out any differences. What I present below is meant as more of an algorithm than an actual implementation (though it does work). It could be tweaked quite a bit in actual implementation to get much better performance. This is probably not the best perl implementation, but it is a good general-purpose algorithm for doing "diffrence of lists/difference of hashes".

my @k1=sort keys %h1; my @k2=sort keys %h2; my \$k1; my \$k2; while((scalar @k1 > 0)&&(scalar @k2 > 0)){ if(!defined \$k1){ \$k1=shift @k1; } if(!defined \$k2){ \$k2=shift @k2; } if(\$k1 eq \$k2){ if(\$h1{\$k1} ne \$h2{\$k2}){ # .. keys match but contents dont } undef \$k1; undef \$k2; }elsif(\$k1 lt \$k2){ # .. key in k1 and not in k2 undef \$k1; }else{ # .. key in k2 and not in k1 undef \$k2; } } if(defined \$k1){ foreach (\$k1,@k1){ # .. key in k1 and not in k2 } } if(defined \$k2){ foreach (\$k2,@k2){ # .. key in k2 and not in k1 } }

In reply to RE: diff of two hashes. by lhoward
in thread diff of two hashes. by ChuckularOne

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