index.js

const segments = (state = {}, action) => {
  switch (action.type) {
    case actions.LOAD_SEGMENTS:
      return {
        ...state,
        segments: action.segments
          .map(segments => segments.values_)
          .reduce((result, item) => {
            return {
              ...result,
              [item.highway]: {
                ...result[item.highway],
                [item.district]: {
                  ...(result[item.highway] ? result[item.highway][item.district] : {}),
                  [item.segment]: item,
                }
              },
            }
          }, {}),
      }
    default:
      return state;
  }
};

I am going to jail for this code