안드로이드 recycler adapter onclick 함수

레퍼런스 메소드로 넒겨준다

private val adapter = ProductCardListAdapter(::onItemClicked, ::onFavoriteIconClicked)

    private fun onItemClicked(viewState: ProductCardViewState) {
        findNavController().navigate(ProductListFragmentDirections.actionProductListFragmentToProductDetailsFragment())
    }

    private fun onFavoriteIconClicked(viewState: ProductCardViewState){
        viewModel.favoriteIconClicked(viewState.id)
    }