In this case, if $sheet->{MaxRow} doesn't have a non-zero value, it takes the value of $sheet->{MinRow}.

But beware, Perl has a wider view of what constitutes a false value. The following values are all false:

• undef
• 0 (either as a number or string)
• "" (the empty string)

Everything else is true. This means that values such as "0.0" or "0e00" are true, not false.

print "undef  is ", ( undef  ) ? "true\n" : "false\n";
print "0      is ", ( 0      ) ? "true\n" : "false\n";
print "'0'    is ", ( '0'    ) ? "true\n" : "false\n";
print "''     is ", ( ''     ) ? "true\n" : "false\n";
print "' '    is ", ( ' '    ) ? "true\n" : "false\n";
print "'0.0'  is ", ( '0.0'  ) ? "true\n" : "false\n";
print "'0e00' is ", ( '0e00' ) ? "true\n" : "false\n";
__DATA__
undef  is false
0      is false
'0'    is false
''     is false
' '    is true
'0.0'  is true
'0e00' is true
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I don't know the specifics of Spreadsheet::ParseExcel, so this may not relevant ;)