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HTML

              
                <div id='root'></div>
              
            
!

CSS

              
                
              
            
!

JS

              
                // For this demo, we are using the UMD build of react-router-dom
const {
  HashRouter,
  Switch,
  Route,
  Link
} = ReactRouterDOM


const SecondPage = () => (
  <div>
    <h2> I am second page </h2>
  </div>
);

const NewPage = () => (
  <div>
    <h2> Add New page </h2>
  </div>
);


const NoMatch = () => (
  <div>
    <h2> Opps 404 </h2>
  </div>
);

const Homepage = () => (
  <div>
    <h2> HOMEPAGE</h2>
  </div>
);

// <Route path="/:langage?" component={RoutePage}/>
const App = () => (
  <div>
    <Route path="/" component={RoutePage}/>
  </div>
);



class RoutePage extends React.Component {
  componentDidMount() {
    console.log('logic for checking current language here');
  }
  
  componentWillUpdate() {
    console.log('logic for checking current language here');
    console.log(this.props);
  }
  
  render() {
    // ???
    // If I add optional param to main route then route "/second" will be render homepage
    // <Route exact path="/:language?" component={Homepage} />
     return (
       <div>
         <ul>
           <li><Link to='/'>Home</Link></li>
           <li><Link to='/en'>Home EN</Link></li>
           <li><Link to='/second'>second</Link></li>
           <li><Link to='/en/second'>second EN</Link></li>
           <li><Link to='/add'>add</Link></li>
           <li><Link to='/en/add'>add EN</Link></li>
         </ul>
         
         <Switch>  
           <Route exact path="/" component={Homepage} />
           <Route exact path="/en" component={Homepage} />
           <Route path="/:language?/second" component={SecondPage} />
           <Route path="/:language?/add" component={NewPage} />
           <Route component={NoMatch} />
        </Switch>
       </div>
     ); 
  } 
}


ReactDOM.render((
  <HashRouter>
    <App />
  </HashRouter>
), document.getElementById('root'))

              
            
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999px

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