NSMutableArrays - can I do this?

Assigning nil to tmpArray only sets your pointer to the object to nil . It does not affect the object itself (or its lifecycle) at all. In this case, setting the objects you've created to nil does nothing, since their variable declaration is in local scope - if you want the objects to be deallocated from memory you need to send them release before setting the pointer to the object to nil .

TmpArray is a pointer, and it's initialized to point to the same mutable array that sharedMutableArray points to. For that reason, the line.

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