Finding if a module is already 'require'd

[Ramprasad A Padmanabhan]

How do I find in a function if a particular module is already loaded

for eg,

sub mysub {
        my @vars = @_;
        require Data::Dumper unless ( already_required('Data::Dumper'));
        print Data::Dumper::Dumper(\@vars);
}

I want help writing the function already_required()


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