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introduction to Perl 5 for web developers
Using "=>"  
The => keyword is also useful in making hash definitions more readable. The operator is used to associate keys and values. Thus,

my %client_def = (
        'name',  'Selena',
        'phone', '213-234-5068',
        'email', 'selena@eff.org'
);

may also be written as:

my %client_def = (
    'name'  => 'Selena',
    'phone' => '213-234-5068',
    'email' => 'selena@eff.org'
);

The primary benefit of this is that it can make complex hash definitions much more readable and intuitive.

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