struct Score: Comparable { let user: String let value: Int static func < (l: Score, r: Score) -> Bool { l.value < r.value } } let scores = [Score(user: "A", value: 10), Score(user: "B", value: 5), Score(user: "C", value: 7)] let sorted = scores.sorted() print(sorted.map { $0.value }) print(sorted.last!.value)