how to declare an optional route in laravel code example

Example 1: route optional parameter laravel

Route::get('user/{name?}', function ($name = null) {
    return $name;
});

Route::get('user/{name?}', function ($name = 'John') {
    return $name;
});

Example 2: laravel route optional parameter

Route::get('/sample/{param?}', 'SampleController@index');