Is It Necessary to Set Pointers to nil in Objective-C After release?

Question

Is there anything wrong with doing something like

NSString * string = [ [ NSString alloc ] init ];
...
[

Answer 1

Setting an instance variable to nil is more useful in a multi-threaded application than a single-threaded one, since with multiple threads you can't always guarantee that an instance variable will only be read before it's released.

I generally don't bother in single-threaded applications, unless there's some other compelling reason.