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== Why are you reading this? ==

On the surface this sounds like an odd opening sentence for a programming book. After all, if this were a book about JavaScript or PHP I'd be safe in assuming that you planned to develop some kind of web site or web application. Similarly, if this were a Visual Basic book it'd be a good bet that you had plans to write a Windows application. Indeed, had I asked this question a few years ago, I could have guessed with a reasonable level of confidence that you wanted to learn Objective-C in order to develop some software to run on Apple's Mac OS X operating system. Now, however, there is a greater likelihood that you plan to develop an application to run on the iPhone.

Perhaps one key advantage to using a Mac OS X system for learning Objective-C comes in the form of access to Apple's Xcode development environment. Other than references to Xcode in early chapters, however, the remainder of this book is intended to be as platform agnostic as possible.