Even better example:
#! perl -slw
use strict;
sub recurse {
print ">> '${ $_[ 0 ] }'";
(my $depth=$_[1])--;
if ($depth) {
recurse( \ substr( ${ $_[ 0 ] }, 1, -1 ), $depth );
}
else {
${$_[0]} = "XX";
}
print "<< '${ $_[ 0 ] }'";
return;
}
my $str = 'abcdefghi';
recurse \$str, 3;
print $str;
recurse \$str, 2;
print $str;
__END__
>> 'abcdefghi'
>> 'bcdefgh'
>> 'cdefg'
<< 'XX'
<< 'bcdefgh'
<< 'abcdefghi'
abcdefghi
>> 'abcdefghi'
>> 'bcdefgh'
<< 'XXi'
<< 'aXXi'
aXXi
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