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With Javascript appearing to be the ubiquitous programming language of the web over the next few years, new frameworks popping up every five minutes and event driven programming taking a lead both server and client side:

Do you as a Javascript developer consider the traditional Design Patterns as important or less important than they have been with other languages / environments?.

Please name the top three design patterns you, as a Javascript developer use regularly and give an example of how they have helped in your Javascript development.