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PO
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Id
16795780
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0
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0
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CreationDate
2013-05-28T15:24:06.033
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2013-05-28T15:46:13.620
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2013-05-28T15:46:13.620
LastEditorUserId
725418
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725418
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16795591
PostTypeId
2
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2
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text
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You can use whatever value you wish as a hash value, including the name of another key. You can not, however, fail to quote the value, as it is not automagically quoted like the keys: <pre><code>my %hash = ( abs => 'foo', xyz => 'abs' ); </code></pre> Quoting a parameter preceeding <code>=></code> is optional, if it does not contain spaces. Quoting the parameter following it is not. You might also be interested to know that <pre><code>[a,b,c,d] </code></pre> will produce warnings, if you have warnings turned on (which you always should). <pre><code>Unquoted string "a" may clash with future reserved word at Unquoted string "b" may clash with future reserved word at </code></pre> The reason this still "works" is -- as far as I know -- for backwards compatibility, and you should always quote your strings. Furthermore, case in point, your bareword <code>abs</code> is actually mistaken for the built-in function <a href="http://perldoc.perl.org/functions/abs.html" rel="nofollow"><code>abs</code></a>, which in this case will try to find the absolute value of <code>$_</code>, and probably fail, returning 0 (and issuing a warning about undefined value in <code>$_</code>). What your array ref should look like is this: <pre><code>['a', 'b', 'c', 'd'] </code></pre> Or with a simpler syntax, using the <code>qw()</code> operator: <pre><code>[ qw(a b c d) ] </code></pre> You might also note that semi-colon <code>;</code> is not a valid character inside an assignment to a hash. The key/value pairs inside the parentheses shall be delimited with commas, nothing else.
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1. POHow to use a key in hash for a value for another key
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