code: private function determineJumpToInformation()
      {
          // Get the right jumpto.
          $translated       = $this->metaModel->isTranslated();
          $desiredLanguage  = $this->metaModel->getActiveLanguage();
          $fallbackLanguage = $this->metaModel->getFallbackLanguage();
          $jumpToPageId     = '';
          $filterSettingId  = '';
  
          if (!isset($this->jumpToCache[$desiredLanguage . '.' . $fallbackLanguage])) {
              foreach ((array) $this->get('jumpTo') as $jumpTo) {
                  $langCode = $jumpTo['langcode'];
                  // If either desired language or fallback, keep the result.
                  if (!$translated || ($langCode == $desiredLanguage) || ($langCode == $fallbackLanguage)) {
                      $jumpToPageId    = $jumpTo['value'];
                      $filterSettingId = $jumpTo['filter'];
                      // If the desired language, break.
                      // Otherwise try to get the desired one until all have been evaluated.
                      if ($desiredLanguage == $jumpTo['langcode']) {
                          break;
                      }
                  }
              }
  
              $pageDetails   = $this->getPageDetails($jumpToPageId);
              $filterSetting = $filterSettingId
                  ? $this->getFilterFactory()->createCollection($filterSettingId)
                  : null;
  
              $this->jumpToCache[$desiredLanguage . '.' . $fallbackLanguage] = array(
                  'page'          => $jumpToPageId,
                  'pageDetails'   => $pageDetails,
                  'filter'        => $filterSettingId,
                  'filterSetting' => $filterSetting,
                  // Mask out the "all languages" language key (See #687).
                  'language'      => $pageDetails['language'],
                  'label'         => $this->getJumpToLabel()
              );
          }
  
          return $this->jumpToCache[$desiredLanguage . '.' . $fallbackLanguage];
      }
docs: Determine the page id and other details.
  
  @return array