Is This Book for You?
If you plan on writing an application that saves data to disk, then you should take a very long look at Core Data. Whether you’re focusing on the desktop or the iPhone, Core Data is the most efficient solution to data persistence.
A good way to confirm that you know enough Cocoa to benefit from this book is to take a look at Chapter 1, Before We Begin. You should find it dense, but every step should be familiar to you.
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