How to determine the current iPhone/device model?

This tutorial we are creating an extension for determine the iOS device model name.

Extension UIDevice :

extension UIDevice {
    static let modelName: String = {
        var systemInfo = utsname()
        uname(&systemInfo)
        let machineMirror = Mirror(reflecting: systemInfo.machine)
        let identifier = machineMirror.children.reduce("") { identifier, element in
            guard let value = element.value as? Int8, value != 0 else { return identifier }
            return identifier + String(UnicodeScalar(UInt8(value)))
        }

        func mapToDevice(identifier: String) -> String {
            #if os(iOS)
                switch identifier {
                case "iPod5,1":                                 return "iPod Touch 5"
                case "iPod7,1":                                 return "iPod Touch 6"
                case "iPhone3,1", "iPhone3,2", "iPhone3,3":     return "iPhone 4"
                case "iPhone4,1":                               return "iPhone 4s"
                case "iPhone5,1", "iPhone5,2":                  return "iPhone 5"
                case "iPhone5,3", "iPhone5,4":                  return "iPhone 5c"
                case "iPhone6,1", "iPhone6,2":                  return "iPhone 5s"
                case "iPhone7,2":                               return "iPhone 6"
                case "iPhone7,1":                               return "iPhone 6 Plus"
                case "iPhone8,1":                               return "iPhone 6s"
                case "iPhone8,2":                               return "iPhone 6s Plus"
                case "iPhone9,1", "iPhone9,3":                  return "iPhone 7"
                case "iPhone9,2", "iPhone9,4":                  return "iPhone 7 Plus"
                case "iPhone8,4":                               return "iPhone SE"
                case "iPhone10,1", "iPhone10,4":                return "iPhone 8"
                case "iPhone10,2", "iPhone10,5":                return "iPhone 8 Plus"
                case "iPhone10,3", "iPhone10,6":                return "iPhone X"
                case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":return "iPad 2"
                case "iPad3,1", "iPad3,2", "iPad3,3":           return "iPad 3"
                case "iPad3,4", "iPad3,5", "iPad3,6":           return "iPad 4"
                case "iPad4,1", "iPad4,2", "iPad4,3":           return "iPad Air"
                case "iPad5,3", "iPad5,4":                      return "iPad Air 2"
                case "iPad6,11", "iPad6,12":                    return "iPad 5"
                case "iPad7,5", "iPad7,6":                      return "iPad 6"
                case "iPad2,5", "iPad2,6", "iPad2,7":           return "iPad Mini"
                case "iPad4,4", "iPad4,5", "iPad4,6":           return "iPad Mini 2"
                case "iPad4,7", "iPad4,8", "iPad4,9":           return "iPad Mini 3"
                case "iPad5,1", "iPad5,2":                      return "iPad Mini 4"
                case "iPad6,3", "iPad6,4":                      return "iPad Pro 9.7 Inch"
                case "iPad6,7", "iPad6,8":                      return "iPad Pro 12.9 Inch"
                case "iPad7,1", "iPad7,2":                      return "iPad Pro 12.9 Inch 2. Generation"
                case "iPad7,3", "iPad7,4":                      return "iPad Pro 10.5 Inch"
                case "AppleTV5,3":                              return "Apple TV"
                case "AppleTV6,2":                              return "Apple TV 4K"
                case "AudioAccessory1,1":                       return "HomePod"
                case "i386", "x86_64":                          return "Simulator \(mapToDevice(identifier: ProcessInfo().environment["SIMULATOR_MODEL_IDENTIFIER"] ?? "iOS"))"
                default:                                        return identifier
                }
            #endif
        }

        return mapToDevice(identifier: identifier)
    }()

}

How use : 

let modelName = UIDevice.modelName
print(modelName)

How To Detect if the device is iPhone X?

Thanks.