On February 21th 2012 I will deliver a short lecture about Chrome OS extensions and applications development. The lecture will take place in DevCon 2012. During this lecture you will learn how to develop a simple extension and a simple application for the Chrome OS platform and how to place them for sale at Google Chrome web store. You can download the slides and the code samples.
The Visitor Design Pattern
The visitor design pattern allows us to add operations to objects that already exist without modifying their classes and without extending them.