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Id
4093944
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0
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CreationDate
2010-11-04T04:40:51.100
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2016-02-02T22:38:42.610
LastEditDate
2016-02-02T22:38:42.610
LastEditorUserId
327528
OwnerUserId
296418
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4093895
PostTypeId
2
Score
27
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LastEditorDisplayName
text
Body
From <a href="http://perldoc.perl.org/perlop.html#Comma-Operator" rel="noreferrer">perlop</a>: <blockquote> The <code>=></code> operator is a synonym for the comma except that it causes its left operand to be interpreted as a string if it begins with a letter or underscore and is composed only of letters, digits and underscores. This includes operands that might otherwise be interpreted as operators, constants, single number v-strings or function calls. If in doubt about this behaviour, the left operand can be quoted explicitly. Otherwise, the => operator behaves exactly as the comma operator or list argument separator, according to context. For example: <pre><code>use constant FOO => "something"; my %h = ( FOO => 23 ); </code></pre> is equivalent to: <pre><code>my %h = ("FOO", 23); </code></pre> It is NOT: <pre><code>my %h = ("something", 23); </code></pre> The <code>=></code> operator is helpful in documenting the correspondence between keys and values in hashes, and other paired elements in lists. <pre><code>%hash = ( $key => $value ); login( $username => $password ); </code></pre> </blockquote> <hr> From PBP: I have found some good information from Perl Best Practices about Fat Commas <code>=></code> and i think it should be nice to mention over here too. It's better to reserve the fat comma exclusively for the following things:- Use it when constructing a hash: <pre><code>my %h = ( FOO => 23 ); </code></pre> or when passing named arguments to a subroutine ie., <pre><code>$text = format_text({FOO => 23, BAR => 30}); </code></pre> or when creating a constant: <pre><code> Readonly my $FOO => "23"; </code></pre> For more detail see the Chapter4:Values and Expressions (Fat Commas) section of Perl Best Practices.
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1. POHow does double arrow (=>) operator work in Perl?
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1. PTAnswer
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1. USCJ7
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1. USNikhil Jain
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