Alternative to switch statements in reducers

action.js

import { LANGUAGE, COUNTRY } from './constants';
export const setLanguage = language => ({
  type: LANGUAGE,
  language
});
export const setCountry = country => ({
  type: COUNTRY,
  country
});

constants.js

export const LANGUAGE = 'LANGUAGE';
export const COUNTRY = 'COUNTRY';

reducer.js

import { LANGUAGE, COUNTRY } from './constants';
const defaultState = { language: 'en', country: 'ca' };
export default (state = defaultState, action) => {
  const updates = {
    [LANGUAGE]: { language: action.language },
    [COUNTRY]: { country: action.country }
  };
  return updates[action.type] ? Object.assign({}, state, updates[action.type]) : state;
};