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    Part 1: Getting started with Objective-C > An introduction to objects

    3. An introduction to objects

    This chapter covers

    • The concepts of objects, classes, and instances

    • Class hierarchies, inheritance, and polymorphism

    • Foundation Kit

    • The NSString class


    In Objective-C the use of object-oriented programming is optional. Because Objective-C is based on a C foundation, it’s possible to use C-style functions (as evidenced by calls to NSLog in the previous chapter), but Objective-C’s full power is unlocked only if you make full use of its object-oriented extensions.


      

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