Youtube in React: deleting previous search results to prevent flickering

search.js

import {SEARCH_FOR_VIDEOS} from '../actions/search';
import {REQUEST, SUCCESS} from '../actions';

export default function (state = {}, action) {
  switch (action.type) {
    case SEARCH_FOR_VIDEOS[SUCCESS]:
      return reduceSearchForVideos(action.response, action.searchQuery, state);
    case SEARCH_FOR_VIDEOS[REQUEST]:
      // delete the previous search element if we don't load more search results for the previous search query
      return action.nextPageToken ? state : {};
    default:
      return state;
  }
}
/* ... */