DiffUtil example: https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/DiffUtil

DiffUtilCallback.kt

class BlogItemDiffCallback(
    var oldBlogList: List<BlogPost>,
    var newBlogList: List<BlogPost>

): DiffUtil.Callback() {

  override fun areItemsTheSame(
      oldItemPosition: Int,
      newItemPosition: Int
  ): Boolean {
      return (oldBlogList.get(oldItemPosition).pk
              == newBlogList.get(newItemPosition).pk)
  }

  override fun getOldListSize(): Int {
      return oldBlogList.size
  }

  override fun getNewListSize(): Int {
      return newBlogList.size
  }

  override fun areContentsTheSame(
      oldItemPosition: Int,
      newItemPosition: Int
  ): Boolean {
      return (oldBlogList.get(oldItemPosition)
              == newBlogList.get(newItemPosition))
  }
}

SubmitList.kt

fun submitList(blogList: List<BlogPost>){
    CoroutineScope(Main).launch{
        val oldList = items

        withContext(IO){
            val diffResult: DiffUtil.DiffResult = DiffUtil.calculateDiff(
                BlogItemDiffCallback(
                    oldList,
                    blogList
                )
            )

            withContext(Main){
                items = blogList
                diffResult.dispatchUpdatesTo(this@MainRecyclerAdapter)
            }
        }
    }
}