Monks,

I want to do complex sorts on hash values, so I am using sort subroutines to do the comparisons. Although this works fine, I would like to move the 'up' and 'down' subs outside the scope of the 'sort_em' sub and pass in the %nos hash explicitly. This would make the sorting subs much more re-usable because I could then access them from different places, I could even hide them away in a module. Is this possible? 

#!/usr/bin/perl
# sort_em.plx
use warnings;
use strict;

my %numbers = qw(one 1 two 2 three 3 four 4 five 5 six 6 seven 7 eight
+ 8);

sort_em(\%numbers);

sub sort_em {
    our %nos =  %{$_[0]};
    print "UP:\n";
    print join "\n", sort up   keys %nos; 

    print "\n\nDOWN:\n";
    print join "\n", sort down keys %nos; 

    sub up   { $nos{$a} <=> $nos{$b} }
    sub down { $nos{$b} <=> $nos{$a} }
}

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In reply to Scoping issue when sorting with subroutines by Dave05

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