practical_coroutines_2.kt

class MyViewModel : ViewModel(), CoroutineScope {
  
  override val coroutineContext = 
      viewModelScope.coroutineContext + Dispatchers.Default
  
  fun someF() {
    launch {
       // No need to write viewModelScope.launch 
       // and this is automatically on Dispatchers.Default
     }
  }
  
  // Since our scope uses the context from viewModelScope when it is cancelled, 
  // so is our custom scope and hence all 
  // coroutines launched inside our custom scope
}