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Cocoa Dev Central: Learn Objective-C. Objective-C Objective-C is the primary language used to write Mac software.
If you're comfortable with basic object-oriented concepts and the C language, Objective-C will make a lot of sense. If you don't know C, you should read the C Tutorial first. This tutorial is written and illustrated by Scott Stevenson Copyright © 2008 Scott Stevenson.
Getting started.