laravel how to pass oneclass function in the route code example

Example 1: laravel route pattern

Route::pattern('id', '[0-9]+');
Route::get('user/{id}', function ($id) {
    // Only executed if {id} is numeric...
});

Example 2: laravel route

Route::view('/welcome', 'welcome');

Route::view('/welcome', 'welcome', ['name' => 'Taylor']);