I cannot seem to understand these two lines in the state code lab. private var _todoItems = MutableLiveData(listOf<TodoItem>()) val todoItems: LiveData<List<TodoItem>> = _todoItems If todoItems is immutable val, then how is it constantly updated with _todoItems livedata?

Think in Java if you wrote List<String> l = new ArrayList<String>()

So, todoItems is not really immutable, is it?

yes, it’s correct, they are read only,

The

todoItems

variable always points to the same object in memory (the

LiveData

object), that's what

val

means.

val

says nothing about the mutability of the object itself