Swift 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>? {
        if let dict = NSJSONSerialization.JSONObjectWithData(self.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true),
            options: .AllowFragments,
            error: nil) as? Dictionary<String,AnyObject>
        {
            return dict
        }
        
        return nil
    }
}

class Person {
    var firstName:String?
    var lastName:String?
    var id:Int?
    
    convenience init(attributes:Dictionary<String, AnyObject>) {
        self.init()
        
        for (key, value : AnyObject) 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)
    
    println("Sweet! \(person.firstName) \(person.lastName)")
}
else {
    println("Uh oh!")
}

I forked and rewrote this in Swift4
check out here https://gist.github.com/closer27/59d481d51eb5bc2fe3e24a21d9f3f8e4