This is a companion discussion topic for the original entry at https://www.raywenderlich.com/977854-data-structures-algorithms-in-swift/lessons/12
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/977854-data-structures-algorithms-in-swift/lessons/12
I have a question, when you are creating the first method inOrderTraversal, “visit”, is a completion handler?, I would like to understand more about
visit is a closure. It lets you define what visit does each time the method is called. In our serialize() function, visit adds the value of each node to an array.
I don’t think I’d call visit a completion handler, though, because we aren’t really using visit to mark the completion of anything. A completion handler for a binary tree might be a closure that’s called once the entire tree has been traversed.
I’m sorry, we don’t understand. Can you clarify?
Hm… it looks very strange as the main words of my message just vanished totally…
Once again =) Why do we use Element first and T afterwards? Why can’t we use T or Element always?
Aha! That makes much more sense 
You can use T or Element every time. Really, you can name them whatever is most meaningful to you. I should have been more consistent, though. My apologies!
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Thank you very much =)