in reply to kind of effort required for learning OO perl ?!

I'll just answer the easiest question and leave the others to my more OO-confident brethren:

http://perldoc.perl.org/perlobj.html contains information on how perl handles objects, and enough references for further reading to keep you busy for the day. Once you get the hang of that, there are also plenty of CPAN modules to use for OO programming, the most well-known being Moose.

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