Sorry for my English. i think its not true, in exercise we must "For further practice, extend the Song struct below by adding a isLongerThan method. You can paste your code from page 6 as a starting point. Then use a loop to find the longest song in the array and print it to the console." So my code is struct Song { let title: String let artist: String let duration: Int var formattedDuration: String { let minutes = duration / 60 // The modulus (%) operator gives the remainder let seconds = duration % 60 return "\(minutes)m \(seconds)s" } var formattedTitle: String { return "\(title) by \(artist)" } var songInformationReImplement :String { return "The song \(title) by \(artist) has \(duration) sec" } //adding a isLongerThan method var durationCount: Int { return duration } func isLongerThan(_ song: Song) -> Bool { let songOne = durationCount let songTwo = song.durationCount return songOne > songTwo }** } //Hint: use a variable to keep track of the longest song and initialize it to the first one in the array. var longestSong = songs[0] //And for..in statment for i in 0...songs.count - 1 { if songs[i] .isLongerThan(longestSong) { longestSong = songs[i] } } print (longestSong)