I just updated the getting started project available on GitHub - https://github.com/valentinstoychev/nativescript-samples/tree/master/Tasks, with three more samples:
Using ‘fps-meter’ NativeScript module to monitor the frames per seconds metric for your application. See Page6.js source code.
Writing platform-specific code and how to detect on which platform your application is running on. See Page9.js
I hope you find those simple basic samples useful. If you have any feedback or if you want to see a specific scenario implemented please let me know. I will be glad to show you the code :).