Yes, that is the usual way it is done. The perl reference documentation article sort has a nice discussion with several examples and some hints about making sorts efficient.
BTW, if you are only using $key to handle the array elements, you can declare it directly in the foreach loop. That is considered better practice because it keeps the variable as close as possible to where it is actually used:
foreach my $key (@keys)
{
print "$key: $hash{$key}\n";
}
Best, beth
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