This is a companion discussion topic for the original entry at https://www.raywenderlich.com/1941154-fundamental-ios-design-patterns/lessons/18
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/1941154-fundamental-ios-design-patterns/lessons/18
The contents of starter and final folders for almost all the playground projects have been interchanged, just thought I’d notify 
@jrg.developer Can you please help with this when you get a chance? Thank you - much appreciated! :]
Whoops, this one is indeed flipped 
We’ll get this fixed and audit the others… thanks for pointing this out!
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I don’t get it that why use the memento. Even Comment following code in this playground, it still works!
typealias GameMemento = Data
Could you explain more for that?
Anyway, I think you should change folder between starter and final. I found that code in starter folder.
In this case, the Memento type is simply Data. To make this obvious in the playground example, this typealias adds another “name” for Data – that is, GameMemento.
You could indeed simply use Data throughout the playground too. This is merely a hint to indicate to other readers (developers) what your intentions are. :]