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Lesson 5, “The Foundation Framework,” discusses a collection of classes from the Foundation framework, how to use those classes and how to explore the documentation of those classes. The lesson begins with how to use strings. Next, viewers learn how to use the most commonly used collection classes, NSArray and NSDictionary and some other lesser known collection classes. Viewers learn how to Box Scalar Values using the NSNumber class. Viewers get a tour of the other frameworks that ship with Mac OS X and iOS so that they are familiar with the tools available to them on those platforms.