Youtube videos reducer: group videos by id and category

videos.js

function groupVideosByIdAndCategory(response) {
  const videos = response.items;
  const byId = {};
  const byCategory = {
    totalResults: response.pageInfo.totalResults,
    nextPageToken: response.nextPageToken,
    items: [],
  };

  videos.forEach((video) => {
    byId[video.id] = video;

    const items = byCategory.items;
    if(items && items) {
      items.push(video.id);
    } else {
      byCategory.items = [video.id];
    }
  });

  return {byId, byCategory};
}