Kotlin: Return can be lifted out of 'when'

Question

The alternative to switch in Kotlin is when. So, inside a recycler view adapter, when I am returning view type, I use when:

Answer 1

In Kotlin, several statements, including if, when and try, can return a value. So in your case, you can refactor the statement to have the when statement return the actual value, which you can then return from the function.

So, you can simplify your method to the following:

override fun getItemViewType(position: Int): Int = when (position) {
    0 -> ItemViewType.TITLE.type
    1 -> ItemViewType.SUBTITLE.type
    2 -> ItemViewType.ITEM.type
    else -> -1
}