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Create References in Perl
A Perl reference is a scalar data type that holds the location of another value which could be scalar, arrays, or hashes. Because of its scalar nature, a reference can be used anywhere, a scalar can be used.
It is easy to create a reference for any variable, subroutine or value by prefixing it with a backslash as follows −
$scalarref = \$foo; $arrayref = \@ARGV; $hashref = \%ENV; $coderef = \&handler; $globref = \*foo;
You cannot create a reference on an I/O handle (filehandle or dirhandle) using the backslash operator but a reference to an anonymous array can be created using the square brackets as follows −
$arrayref = [1, 2, ['a', 'b', 'c']];
Similar way you can create a reference to an anonymous hash using the curly brackets as follows −
$hashref = {
'Adam' => 'Eve',
'Clyde' => 'Bonnie',
};A reference to an anonymous subroutine can be created by using sub without a subname as follows −
$coderef = sub { print "Boink!\n" };
Updated on: 29-Nov-2019
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