recyclerView1.kt

// layout manager calls function getViewForPosition over recycler 
// thus has a recycler.
class LayoutManager(private val recycler: Recycler) {
    fun getViewForPosition(pos: Int): View {
        return recycler.getView(pos)
    }
}

class RecyclerView(
    private val viewCache: ViewCache
) {
    fun getView(pos: Int): View {
        val viewOrNull = viewCache.getOrNull(pos)
        // view found then return view
        if (viewOrNull != null) {
            return viewOrNull
        }
        return TODO()
    }
}

class ViewCache {
    private val viewCache = mutableMapOf<Int, View>() // LRU cache
    fun getOrNull(pos: Int): View? = viewCache.get(pos)
}