Previously I mentioned a project providing an NSObject that causes NSNull to return nil in many cases where NSNull would cause an exception to be thrown which can help cut down on the number of if statements required to validate objects.
Matt Thompson has written a great guide explaining the differences between each of these different representations that should prove very helpful in avoiding any complications that can arise.
You can find the guide on the NSHipster site here.
A nice straightforward explanation of one of those potentially annoying Objective-C idiosyncrasies.
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