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Re: The best "true zero" is...

by jdhedden (Deacon)
on Jun 09, 2005 at 13:32 UTC ( #465119=note: print w/replies, xml ) Need Help??

in reply to The best "true zero" is...

I abstain from voting.
IMHO, the motivation for the poll is pathological. You're asking for the best obfuscation (yes, an oxymoron) for lazy programmers to use.
If you want zero to be true in a conditional, then the correct test is 'defined()'.

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Re^2: The best "true zero" is...
by radiantmatrix (Parson) on Jul 11, 2005 at 20:59 UTC

    There is a difference. For example, DBI's do() returns the number of rows affected -- but some statements succeed even though no rows were affected. This allows for the following bit of code to be sane:

    my $rows = $dbh->do( 'UPDATE MyTable SET note_date = GETDATE() WHERE ErrorCode IS NOT NULL' ); if ($rows) { # true, even if zero rows were affected. print 'Found and updated rows: (',$rows,")\n"; } else { warn 'Error during update query'; }

    Having a query affect zero rows is perfectly valid, and doesn't necessarily mean an error. This makes even more sense when other methods in the same program return '0' as the false value rather than undef: it allows for programmer choice and a consistent read.

    Larry Wall is Yoda: there is no try{}
    The Code that can be seen is not the true Code

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