how it works viewmodel{observe,failure}

>  moviesViewModel = viewModel(viewModelFactory) {
>             observe(movies, ::renderMoviesList)
>             failure(failure, ::handleFailure)
>         }

Taking this example, this viewmodel moves to the method _renderMoviesList_ on success and _handleFailure_ on failure.

But how is this defined in generic type, about the method and params it shall be moving towards?
