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Alex Rivera
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I have this code: - (BOOL)isConnected { return !!_sessionKey; } where _sessionKey is defined earlier as: NSString* _sessionKey; the code comes from the facebook-connect for iphone. Since I am learning Objective-C by looking at code written by other people. The !! used in the isConnection function seems useless to me, or am I missing something? What does it do?
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