code: public function js($group = '*')
      {
          $this->sort();
  
          $jsList = $this->getLoadedJsList($group);
  
          list($jsList) = $this->fireEvent('load.js', [ & $jsList ]);
  
          $jsList = $this->transformListToScriptHtmlNodes($jsList);
  
          return implode("\n", $jsList);
      }
docs: Returns JS tags from given group name.
  If group name is asterisk (*), will return from all loaded groups.
  @param  string $group Group name.
  @return string HTML tags as string.