UsersAdapter.kt

class UsersAdapter : PagedListAdapter<User, UsersAdapter.UsersViewHolder>(
    UsersDiffCallback()
) {

    lateinit var clickListener: (User) -> (Unit)

    override fun onCreateViewHolder(
        parent: ViewGroup, 
        viewType: Int
    ): UsersViewHolder = UsersViewHolder(
        parent.inflate(R.layout.user_list_item)
    )

    override fun onBindViewHolder(holder: UsersViewHolder, position: Int) {

        val user: User? = getItem(position)

        user?.let {
            holder.bind(user, this.clickListener)
        }
    }

    inner class UsersViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bind(item: User, listener: (User) -> Unit) = with(itemView) {
            displayName.text = item.displayName
            userId.text = item.userId.toString()
            location.text = item.location
            userImage.glideUrl(item.profileImage.toString())
            setOnClickListener { listener(item) }
        }
    }
}