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POWhy do I get “uninitialized value” warnings when I use Date::Manip’s UnixDate in a sort block?
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  1. POWhy do I get “uninitialized value” warnings when I use Date::Manip’s UnixDate in a sort block?
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    copied!<blockquote> <p>Related/possible duplicate: <a href="https://stackoverflow.com/questions/1263943/why-do-i-get-uninitialized-value-warnings-when-i-use-datemanips-sortbylength">Why do I get &quot;uninitialized value&quot; warnings when I use Date::Manip&#39;s sortByLength?</a></p> </blockquote> <p>This block of code:</p> <pre><code>my @sorted_models = sort { UnixDate($a-&gt;{'year'}, "%o") &lt;=&gt; UnixDate($b-&gt;{'year'}, "%o") } values %{$args{car_models}}; </code></pre> <p>kept generating the following <s>error</s> warning:</p> <pre> Use of uninitialized value in length at /.../Date/Manip.pm line 244. </pre> <p><a href="http://search.cpan.org/perldoc/Date::Manip" rel="nofollow noreferrer">Date::Manip</a> is a CPAN module. And line 244 of Date::Manip is found within the following block of code:</p> <pre><code># Get rid of a problem with old versions of perl no strict "vars"; # This sorts from longest to shortest element sub sortByLength { return (length $b &lt;=&gt; length $a); } use strict "vars"; </code></pre> <p>But then including this (printing out the actual Unix Date value to the console in the logger) before the block of code to sort the values: </p> <pre><code>foreach (values %{$args{car_models}}) { $g_logger-&gt;info(UnixDate($_-&gt;{'year'},"%o")); } </code></pre> <p>removed the <s>errors</s> warnings entirely. Why? And what is a good fix instead of doing all these logging statements?</p> <p>NOTE: None of the sorted values are undefined because when I printed them out in the logger, I could see that every one of them had a numerical value.</p>
 

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