Summary
This overview could hardly cover every topic of interest regarding the Foundation framework. The information provided in this chapter conveys the breadth of classes available and indicates where to look for more information. It identifies the practical implications of some Cocoa conventions including the ideas of mutability, immutability, and class clusters. Many of the public Foundation classes are abstract interfaces to class clusters, and that fact can have huge impacts on their use. Additional classes such as NSHost and NSProcessInfo, exist but are not described in this overview. Such classes are indispensable in certain circumstances, but are seldom used in practice. Before writing code, be sure that there is no existing Foundation ...
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