Swift4 Playground for initializing objects from Dictionary/JSON

Swift JSON Playground

// Playground - noun: a place where people can play

import Cocoa

extension String {
    func dictionaryFromJSON () -> Dictionary<String, AnyObject>? {
        do {
            if let data = self.data(using: .utf8), let dict = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: AnyObject] {
                return dict
            }
        } catch let error as NSError {
            print("Failed to load: \(error.localizedDescription)")
        }
        return nil
    }
}


class Person {
    var firstName:String?
    var lastName:String?
    var id:Int?
    
    convenience init(attributes:Dictionary<String, AnyObject>) {
        self.init()
        
        for (key, value) in attributes {
            switch key {
            case "firstName":
                self.firstName = value as? String
            case "lastName":
                self.lastName = value as? String
            case "id":
                self.id = value as? Int
            default:
                break;
            }
        }
    }
}

var json : String = "{\"firstName\":\"Bob\",\"lastName\":\"Parr\", \"id\": 113}"

if let patientAttributes = json.dictionaryFromJSON() {
    var person = Person(attributes: patientAttributes)
    
    print("Sweet! \(person.firstName) \(person.lastName)")
}
else {
    print("Uh oh!")
}