Alternate approach to inheritance for Swift structs?

In Swift with struct you can create protocol for common task and also implement default implementation using protocol extension.

protocol Vehicle {    var model: String { get set }    var color: String { get set }}//Common Implementation using protocol extensionextension Vehicle {    static func parseVehicleFields(jsonDict: [String:Any]) -> (String, String) {        let model = jsonDict["model"] as! String        let color = jsonDict["color"] as! String        return (model, color)    }}struct Car : Vehicle {    var model:String    var color:String    let horsepower: Double    let license_plate: String    init(jsonDict: [String:Any]) {        (model, color) = Car.parseVehicleFields(jsonDict: jsonDict)        horsepower = jsonDict["horsepower"] as! Double        license_plate = jsonDict["license_plate"] as! String    }}struct Bicycle : Vehicle {    var model:String    var color:String    let chainrings: Int    let sprockets: Int    init(jsonDict: [String:Any]) {        (model, color) = Bicycle.parseVehicleFields(jsonDict: jsonDict)        chainrings = jsonDict["chainrings"] as! Int        sprockets = jsonDict["sprockets"] as! Int    }}

There is a detailed answer at following Gist, with all possible approaches. I do not like any of them as I am fan of Classes. But structs are future of Swift, you have to understand, adopt and like :( it .

Link: https://gist.github.com/AliSoftware/9e4946c8b6038572d678