■ INTRODUCTION
xiv
■ Object-oriented principles
■ A complex Integrated Development Environment (IDE)
■ The syntax of the programming language
■ Programming logic and principles
Carnegie Mellon University received a grant from the U.S. government and developed Alice. Alice
is an innovative 3D programming environment that makes it easy to create rich graphical
applications for new developers. Alice is a teaching tool for students learning to program in an
OOP environment. It uses 3D graphics and a drag-and-drop interface to facilitate a more
engaging, less frustrating first programming experience.
Alice enables the students to focus on learning the principles of OOP without having to focus on
learning a complex IDE and Objective-C principles all at once. We get to focus on each topic
individually. This helps readers feel a real sense of accomplishment as they progress.
Alice removes all the complexity of learning an IDE and programming language syntax. It is drag-
and-drop programming. You’ll see it is actually fun to do, and you can develop really cool and
sophisticated apps in Alice.
After the OOP topic has been introduced and readers feel comfortable with the material, we then
move into Xcode, where readers get to use their new OOP knowledge in writing Objective-C
applications. This enables readers to focus on the Objective-C syntax and language without
having to learn OOP at the same time.
How This Book Is Organized
You’ll notice that we are all about successes in this book. We introduce the OOP and Logic
concepts in Alice and then move those concepts into Xcode and Objective-C. Most students are
visual and learn by doing. We use both of these techniques. We’ll walk you through topics and
concepts with visual examples and then take you step-by-step examples reinforcing these.
Often we will repeat previous topics to reinforce what you have learned and apply these skills in
new ways. This enables new programmers to re-apply development skills and feel a sense of
accomplishment as they progress.
The Formula for Success
Learning to program is an interactive process between you and your program. Just like learning
to play an instrument, you have to practice. You must work through the examples and exercises
in this book. Just because you understand the concept, doesn’t mean you will know how to apply
it and use it.
You will learn a lot from this book. You will learn a lot from working through the exercises in this
book. But you will really learn when you debug your programs. Spending time walking through
your code and trying to find out why it is not working the way you want is a learning process that
is unparalleled. The downside of debugging is it can be especially frustrating to the new
developer. If you have never wanted to throw your computer out the window, you will. You will
question why you are doing this, and whether you are smart enough to solve the problem.
Programming is very humbling, even for the most experience developer.
Like a musician, the more you practice the better you get. You can do some amazing things as a
programmer. The world is your oyster. It is one of the most satisfying accomplishments you can
have, seeing you app on the iTunes App Store. However, there is a price, and that price is time
spent coding.
Here is our formula for success:
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