It explains exactly how it came about Cocoa and Objective C, and it is also clear why the data types usually begin with "NS". One begins the language in the truest sense of the word "understand".
But also for advanced programmers, the book holds a lot of useful programming techniques available so that each side is required: The novice is slowly but steadily introduced in the programming, the advanced programmers rises in later chapters with a.
Overall, a very good and highly recommended plant, which is also the emphohlen Video Course XCode from 0 to 100, gives it for download on iTunes.