Explain what ARC is and how it works in iPhone / Objective C ? Or what are some of the things you need to be careful about when using ARC in Xcode?

 ARC stands for Automatic Reference Counting, it is not a runtime process but rather a preprocessor system which inserts retain, release and autorelease calls into your code before it is compiled.

The answers are the same as with normal memory management, avoid over retains and retain cycles.


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