This document is about the first component of the development environment—the programming
language and its runtime environment. It fully describes the Objective-C language, and provides a
foundation for learning about the second component, the Mac OS X Objective-C application
frameworks—collectively known as Cocoa. You can start to learnmore about Cocoa by reading Getting
Started with Cocoa. The twomain development tools you use are Xcode and Interface Builder, described
in Xcode User Guide and Interface Builder respectively.
The Objective-C language is a simple computer language designed to enable sophisticated
object-oriented programming. Objective-C is defined as a small but powerful set of extensions to the
standard ANSI C language. Its additions to C are mostly based on Smalltalk, one of the first
object-oriented programming languages. Objective-C is designed to give C full object-oriented
programming capabilities, and to do so in a simple and straightforward way.
For those who have never used object-oriented programming to create applications before, this
document is also designed to help you become familiar with object-oriented development. It spells
out some of the implications of object-oriented design and gives you a flavor of what writing an
object-oriented program is really like
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