lastVisit example

$topics = [];
    $first_new_found = FALSE;
    foreach ($result as $topic) {
      if ($account->isAuthenticated()) {
        // A forum is new if the topic is new, or if there are new comments since         // the user's last visit.         if ($topic->forum_tid != $tid) {
          $topic->new = 0;
        }
        else {
          $history = $this->lastVisit($topic->id(), $account);
          $topic->new_replies = $this->commentManager->getCountNewComments($topic, 'comment_forum', $history);
          $topic->new = $topic->new_replies || ($topic->last_comment_timestamp > $history);
        }
      }
      else {
        // Do not track "new replies" status for topics if the user is anonymous.         $topic->new_replies = 0;
        $topic->new = 0;
      }

      // Make sure only one topic is indicated as the first new topic.