old-web/frontend-react/src/reducers/subcategory.js

import { SUBCATEGORY_SELECT, CATEGORY_SELECT } from "constants/actionTypes";

export default (state = {}, action) => {
  switch (action.type) {
    case SUBCATEGORY_SELECT:
      return { ...state, [action.option.depth]: action.option.selectedOption };
    case CATEGORY_SELECT:
      return {};
    default:
      return state;
  }
};