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Re:Java Was Strongly Influenced by Objective-C by LinaLauneBaer on Thursday June 25, 2015 @12:48PM (#9779205)
Collisions are very very rare. In over 10 years of Objective-C development I have maybe seen it once. Also: clang got much better at detecting collisions at compile time (where possible).

That said: Swift extensions are safer because private categories cannot collide.

Re:Java Was Strongly Influenced by Objective-C by swolchok on Thursday June 25, 2015 @01:08PM (#9779335)
Try OBJC_PRINT_REPLACED_METHODS sometime. It's frightening. (http://stackoverflow.com/questions/9466732/in-objective-c-ho...)
Re:Java Was Strongly Influenced by Objective-C by spiralpolitik on Thursday June 25, 2015 @02:07PM (#9779783)
This has been my experience as well.