More than two years ago we reviewed the first edition of the excellent book by Aaron Hillegass, "Cocoa Programming for Mac OS X". The second edition has just being released and we will be taking a quick look as to what's new.
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GNUstep doesn't have implemented most of Cocoa's API
Are you sure ? 90% (if not more) of Cocoa API is OpenStep, which GNUstep implements. Additions to OpenStep API could exist ot not in GNUstep, but many are (NSDocument, NSToolbar, etc.). What's missing is NSDrawer, the XML classes (because GNUstep already have ones, and you could use others framework like skyrix-xml -- but compatible classes will appear anyway), and some recent additions like the controllers stuff (panther).
GNUstep doesn't have implemented most of Cocoa's API
Are you sure ? 90% (if not more) of Cocoa API is OpenStep, which GNUstep implements. Additions to OpenStep API could exist ot not in GNUstep, but many are (NSDocument, NSToolbar, etc.). What's missing is NSDrawer, the XML classes (because GNUstep already have ones, and you could use others framework like skyrix-xml -- but compatible classes will appear anyway), and some recent additions like the controllers stuff (panther).