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Similarly, object methods can be modified while your code is running. Objective-C is a dynamic language, so you can change the behavior of your objects at any time. Each of these messages is handled by a method defined by the object. A method uses a unique signature that lets Objective-C route your message and any parameters to the right code for execution. You’ll find that many method signatures are quite readable in your code: It’s a little more typing, but you’ll end up with code that’s easier to understand.

22 iPhone App Development: The Missing Manual Exploring Your New Tools Once you’ve built your app, you can run it on your iPhone. Or better yet, run it on your Mac. That’s right. If you’re like most developers, you’ll run your iPhone apps on the Mac about 90 percent of the time. Apps launch faster on the Mac than on the iPhone, and they’re easier to debug on the Mac when problems occur. Note: Don’t discount that last 10 percent. Running your app on an actual device is extremely important: You’ll learn why when design issues are discussed in Chapter 4.

Before that question is answered, take a look at the language’s name—the C on the end. You see, this whole new language is really based on an old one: the C language developed by Dennis Ritchie at Bell Telephone Laboratories in 1972. As with Java and JavaScript, the creators of ­Objective-C built something new on top of something familiar to many programmers. Once you learn a few tricks, this language will quickly become familiar to you, too (For more information on the relationship between Objective-C and other C languages, see the box below).

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