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by uxp
3888 days ago
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This is entirely incorrect. nil is a pointer to the value 0, and in C there is only one value that evaluates to a logical false, which is 0. Invoking a method on nil returns 0. This itself alleviates the kind of nil-check-chains discussed in this thread: [[[user profile] name] isEqualToString:@"Paul"];
[user profile] && [[user profile] name] && [[[user profile] name] isKindOf:NSString] && [[[user profile] name] isEqualToString:@"Paul"];
if user.profile.name is nil, then that expression evaluates to the value 0, which as we discovered, is the _only value that evaluates to false in C_ |
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