Youtube in React: related videos selector

videos.js

const getRelatedVideoIds = (state, videoId) => {
  const related = state.videos.related[videoId];
  return related ? related.items : [];
};
export const getRelatedVideos = createSelector(
  getRelatedVideoIds,
  state => state.videos.byId,
  (relatedVideoIds, videos) => {
    if (relatedVideoIds) {
      // filter kicks out null values we might have
      return relatedVideoIds.map(videoId => videos[videoId]).filter(video => video);
    }
    return [];
  });