block3.tsx

const moviesInitialState: MovieDTO[] = [];

export const movieReducer = (
    state = moviesInitialState,
    action: MovieListActionTypes
): MovieDTO[] => {
    switch (action.type) {
        case MovieListRetrieved:
            return action.movies;
        case ClearMovieListRequest:
            return [];
        default:
            return state;
    }
};