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What happens when we invoke a method on a nil pointer?

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What happens when we invoke a method on a nil pointer?

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A message sent to a nil object is perfectly acceptable in Objective-C, it’s treated as a no-op. There is no way to flag it as an error because it’s not an error, in fact it can be a very useful feature of the language. It returns 0, nil, a structure filled with 0s, etc.

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