Does Objective-C use short-circuit evaluation?

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Objective-C does support short-circuit evaluation, just like C.

It seems that in your example myString is NSNull and not nil, therefore myString != nil is true.

NSNull is a singleton and is used to represent nil where only objects are allowed, for example in an NSArray.

Btw, normally, people write if (!myString && myString.length == 0). Comparing to nil is quite ugly. Also, I’d compare the length to 0. That seems to be more clear.

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