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Part II: The Foundation Framework > Numbers, Strings, and Collections
15. Numbers, Strings, and Collections
This chapter describes how to work with some of the basic objects provided in the Foundation framework. These include numbers, strings, and collections, which refers to the capability to work with groups of objects in the form of arrays, dictionaries, and sets.
The Foundation framework contains a plethora of classes, methods, and functions for you to use. Approximately 125 header files are available under Mac OS X. As a convenience, you can simply use the following import:
