use Algorithm::Loops 'MapCarMin';
%hash = MapCarMin {@_} [ 0 .. keys %hash ],
    [ @hash{ sort {$a<=>$b} keys %hash } ];

[download]
or 
%hash = map {
    ref($_) && $_ == \$hash{''}
        ?   ( delete $hash{''} )[1..0]
        :   ( ++$hash{''}, $_ )
}   @hash{ sort {$a<=>$b} keys %hash }, \$hash{''};

[download]
( though this next one not working is quite clearly and simply a bug in Perl: 
@hash{ 1..keys %hash } = delete @hash{
    sort {$a<=>$b} keys %hash };

[download]
! :)

- tye        

In reply to Re: re-key a hash (tye) by tye
in thread re-key a hash by Anonymous Monk

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