old_contents: export const selectPage = (state) => state.app ? state.app.page : "";
  export const selectPageExtra = (state) => state.app ? state.app.pageExtra : "";
  export const selectManagers = (state) => state.list ? state.list.managers : [];
  export const selectGameTypeFilter = (state) => state.list ? state.list.gameTypeFilter : "";
  export const selectParticipatingActiveGames = (state) => state.list ? state.list.participatingActiveGames : [];
  export const selectParticipatingFinishedGames = (state) => state.list ? state.list.participatingFinishedGames : [];
  export const selectVisibleActiveGames = (state) => state.list ? state.list.visibleActiveGames : [];
  export const selectVisibleJoinableGames = (state) => state.list ? state.list.visibleJoinableGames : [];
  export const selectAllGames = (state) => state.list ? state.list.allGames : [];
  export const selectGameRoute = (state) => state.game && state.game.id ? {id: state.game.id, name: state.game.name} : null;
  
new_contents: import { createSelector } from 'reselect';
  
  export const selectPage = (state) => state.app ? state.app.page : "";
  export const selectPageExtra = (state) => state.app ? state.app.pageExtra : "";
  export const selectManagers = (state) => state.list ? state.list.managers : [];
  export const selectGameTypeFilter = (state) => state.list ? state.list.gameTypeFilter : "";
  export const selectParticipatingActiveGames = (state) => state.list ? state.list.participatingActiveGames : [];
  export const selectParticipatingFinishedGames = (state) => state.list ? state.list.participatingFinishedGames : [];
  export const selectVisibleActiveGames = (state) => state.list ? state.list.visibleActiveGames : [];
  export const selectVisibleJoinableGames = (state) => state.list ? state.list.visibleJoinableGames : [];
  export const selectAllGames = (state) => state.list ? state.list.allGames : [];
  
  const selectGameID = (state) => state.game ? state.game.id : '';
  const selectGameName = (state) => state.game ? state.game.name : '';
  
  export const selectGameRoute = createSelector(
      selectGameID,
      selectGameName,
      (id, name) => id ? {id, name} : null
  );
subject: Make selectGameRoute be a reselect selector, so the actual object itself won't change if id and name haven't changed.