In https://developer.android.com/topic/libraries/architecture/viewmodel, the first line mentioned that

The ViewModel class is designed to store and manage UI-related data in a lifecycle conscious way. The ViewModel class allows data to survive configuration changes such as screen rotations.

Let find out how it work underhood

Coroutine is not a new concept, it had always been there with different language like C#, Ruby and etc.

And now, we have coroutine library implemented in Kotlin :D

Love story between RecyclerView and ScrollView

Date time rethink

CppCMS + Lighttpd in FreeBSD