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// Basic enum enum Direction { case north, south, east, west } let heading = Direction.north // Enum with raw values enum Planet: Int { case mercury = 1, venus, earth, mars } let earth = Planet(rawValue: 3) // Optional<Planet> // Enum with associated values enum Result<T> { case success(T) case failure(Error) } enum NetworkError: Error { case notFound(url: String) case serverError(code: Int, message: String) case timeout } // Pattern matching with switch func handleError(_ error: NetworkError) -> String { switch error { case .notFound(let url): return "Not found: \(url)" case .serverError(let code, let msg): return "Error \(code): \(msg)" case .timeout: return "Request timed out" } } let err = NetworkError.serverError(code: 500, message: "Internal error") print(handleError(err))
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