Sorry, I can't resist: 
my %statistics;
undef @statistics{ 1..10 }; # or @statistics{ 1..10 } = (0) x 10
say join "\n", sort { $a <=> $b } keys %statistics;

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or, if you don't need a name and like the 0 values: 
say join "\n", sort { $a <=> $b } keys %{{ map { $_ => 0 } 1..10 }}

[download]

In reply to Re^2: Sorting integer value hash keys by JadeNB
in thread Sorting integer value hash keys by Anonymous Monk

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