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introduction to Perl 5 for web developers
Using qw  
The "qw" keyword is a useful new addition to the language that allows you to bypass the surrounding quote and separating comma characters in an array definition. For example:

     my @names = ("Eric", "Fred", "Gunther");

can now be represented as

     my @names = qw(Eric Fred Gunther);

There is a caveat: you can't add $foo into qw(), it won't interpolate. This means that @names = qw($foo Fred Gunther) would produce an array where the first value was literally $foo and not the value of $foo. The qw() operator is commonly referred to as the '[q]uote [w]ord'.

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