I was given this book by being a member of the Des Moines Cocoaheads group, and as a new developer on the Mac, I was very grateful for it. While other books provide a better introduction to Cocoa and Objective-C, Xcode 3 Unleashed fills a gap by providing detailed explanations of the Xcode IDE itself.
I was able to immediately make use of Chapter 8, Version Control, in my project. That chapter alone is almost worth the cost of the book. It steps you through creating a local repository, adding your project to the repository, committing changes, comparing files, and rolling back changes. After using the built in subversion support in Xcode, relying on Time Machine for version control seems archaic.
Fritz Anderson also spends a good deal of time introducing Xcode to developers more familiar with UNIX and Linux development. Chapter 21 is dedicated to "make Veterans", and explains how Xcode builds a project under the hood. This book also includes separate chapters for using the included debugging and optimization tools like Shark and Instruments.
The last thing I'd like to say about the book is that it is beautifully laid out. Full color illustrations and syntax highlighting that matches the default Xcode editor really make the book stand out. I do not think Xcode 3 Unleashed should be the first book you read getting started in Cocoa development, but it is certainly towards the top of the list. I would recommend learning C first, then Objective-C, and then moving into the IDE. You are much more likely to appreciate all that Xcode does for you after that.
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