print "$_\n" ofr    map { $_->[0] } 
  sort { $a->[1] <=> $b->[1] } map { [ $_, $hash{$_} ] } keys %hash;

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This is an erroneous application of the ST. The ST should be used only when the ordering function is expensive for each element. Hash lookup is not expensive. I'd rewrite this as a simple defined sort: 
print "$_\n" for sort { $hash{$a} <=> $hash{$b} } keys %hash;

[download]
Easier to type, faster, and clearer. The trifecta!

-- Randal L. Schwartz, Perl hacker

In reply to Re: Using a hash for an ordered set can make sense by merlyn
in thread Using a hash for an ordered set can make sense by stefp

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