what is a route closure in laravel code example

Example 1: named route with parameter laravel

Route::get('/menu/{category}/{product}/{item}', ['as' => 'named.route' , 'uses' => 'MenuController@listItem']);

// to get the actual linke
route('named.route', ['category' => $category->id, 'product' => $product->id, 'item' => $item->id]);

Example 2: laravel routes return view in web.php

Route::get("/page", function(){
   return View::make("dir.page");
});

Example 3: route() and with() in laravel

Route::get('user/{id}/profile', function ($id) {
    //
})->name('profile');

$url = route('profile', ['id' => 1, 'photos' => 'yes']);

// /user/1/profile?photos=yes

Example 4: laravel route

Route::get('user/{id}', function ($id) {
    return 'User '.$id;
});

Example 5: laravel route

Route::get('posts/{post}/comments/{comment}', function ($postId, $commentId) {
    //
});