Illuminate\Support\Collection::isEmpty PHP Method

    public function isEmpty()
    {
        return empty($this->items);
    }

 /**
  * Modules of installed or not installed.
  *
  * @param bool $installed
  *
  * @return \Illuminate\Support\Collection
  */
 public function getModules($installed = false)
 {
     if ($this->modules->isEmpty()) {
         if ($this->files->isDirectory($this->getModulePath()) && !empty($directories = $this->files->directories($this->getModulePath()))) {
             (new Collection($directories))->each(function ($directory) use($installed) {
                 if ($this->files->exists($file = $directory . DIRECTORY_SEPARATOR . 'composer.json')) {
                     $package = new Collection(json_decode($this->files->get($file), true));
                     if (Arr::get($package, 'type') == 'notadd-module' && ($name = Arr::get($package, 'name'))) {
                         $module = new Module($name);
                         $module->setAuthor(Arr::get($package, 'authors'));
                         $module->setDescription(Arr::get($package, 'description'));
                         if ($installed) {
                             $module->setInstalled($installed);
                         }
                         if ($entries = data_get($package, 'autoload.psr-4')) {
                             foreach ($entries as $namespace => $entry) {
                                 $module->setEntry($namespace . 'ModuleServiceProvider');
                             }
                         }
                         $this->modules->put($directory, $module);
                     }
                 }
             });
         }
     }
     return $this->modules;
 }