This is my recap of the session by Thorsten Hans.
Thorsten is showing demos in a console window, very challenging.
This is a real code sessions and is hard to recap.
To use inheritance you need the prototype keyword.
How to deal with SharePoint?
Using CSOM: You can use Napa for this.
Thorsten is providing some useful tips on how to write manageble JS code in SharePoint. Like using objects.
The last part of the session is about TypeScript.