Swift iOS Development question

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

import UIKit


class DataModel {

    // Should be non nil
    var name: String!
    var image: UIImage!
    var defaultImage: UIImage!

    // Here we create a convenice init with a value for defaultImageKey. From this init we will have two types of init upon calling an init class. see below example.
    convenience
    init (name n: String, image img: UIImage?, defaultImage dImg: UIImage? = UIImage(named: "testDefaultImageKey")) {
        self.init()

        name = n
        image = img
        defaultImage = dImg
    }

    var modelImage: UIImage? {
        // will return image if image is set and defaultimage if not set
        // '??' is like Bool ? yes : no or '?:' in objc
        return image ?? defaultImage
    }
}

var AllDataModel: [DataModel] = []

// This sample conforms to [String: String]
let sampleJSON1 = ["name": "name1", "photo": "imageLink1"]
let sampleJSON2 = ["name": "name2"] // sample with no image link
let sampleJSON3 = ["photo": "imageLink2"] // sample with no image link

func addThis(_ sampleJSON: [String: String]) {

    // this will check if 'photo' key has value same for 'name' otherwise will fall to 'else'
    if let imageLink = sampleJSON["photo"], let name = sampleJSON["name"] {

        // fetch this 'imageLink'. when done fetching from the background, convert it to uiimage
        // insight: don't store image data if it will be use immediately. why? you'll block the main thread converting this to uiimage or will take some time before displaying to user

        let image = UIImage() // the sample fetch converted image
        // init with defaultImage
        let data = DataModel(name: name, image: image)

        // add to your model
        AllDataModel.append(data)

    }else{
        // check for name
        // '??' is like Bool ? yes : no or '?:' in objc
        let name = sampleJSON["name"] ?? "your default name"

        let data = DataModel(name: name, image: nil)
        //let data = DataModel(name: name, image: nil, defaultImage: UIImage(named: "another default image key"))

        // add to your model
        AllDataModel.append(data)
    }
}

addThis(sampleJSON1)
addThis(sampleJSON2)
addThis(sampleJSON3)

// log
for d in AllDataModel {
    d.name
}