Higher Kinded Types with Arrow

Demo.kt

import arrow.Kind
import arrow.core.ForEither
import arrow.core.Option
import com.txusballesteros.codelabs.billboard.api.movie.MovieApi
import com.txusballesteros.codelabs.billboard.core.domain.mapper.map
import com.txusballesteros.codelabs.billboard.core.domain.model.Movie

internal class MovieCloudDataSource<F>(
    private val api: MovieApi
) : MovieDataSource {

    override fun <F> getMovie(id: String): Kind<F, Movie> =
        Option.fromNullable(api.getMovie(id)).fold(
            ifEmpty =  { raiseError(RuntimeException()) },
            ifSome = { just(it.map()) }
        )
}

fun main() {
    val api = MovieApiMock()
    val dataSource: MovieDataSource = MovieCloudDataSource(api)
    val perico = dataSource.getMovie<ForEither>(1).fix()
}