zntfdr

struct Connection {
    let to: Node
    let weight: Int
  
    init(to toNode: Node, weight: Int) {
        assert(weight >= 0, "connection weight has to be equal or greater than zero")
    
        self.to = toNode
        self.weight = weight
    }

zntfdr

struct Node {
    let name: String
    var visited: Bool = false
    var connections: [Connection] = []
  
    init(name: String) {
        self.name = name
    }
}

zntfdr

let json = JSON(data: dataFromServer)

if let model = MyModel.obtainModel(from: json) {
    // success
} else {
    // failure
}

zntfdr

// Some model
struct MyModel {
    let name: String
    let number: Int
    let date: NSDate
}

// Conforming to the new protocol
extension MyModel: JSONParser {
    static func obtainModel(from json: JSON) -> MyModel? {

zntfdr

protocol JSONParser {
    static func obtainModel(from json: JSON) -> Self?
}