anchor.diff:          tooltip: "Add friend",
           icon: new Icon(_isRefreshingNewFriend ? Icons.adjust : Icons.done),
           onPressed: () {
  -          setState(() {
  -            _isRefreshingNewFriend = true;
  -          });
  +          setState(() => _isRefreshingNewFriend = true);
             get(CodeWarsAPI.getUser(_friendNameController.text))
               ..then((val) =>
                   setState(() {
  
positive.code:     }
      List<Widget> _friendsView = _friendUsers.map((user) =>
      new ExpansionTile(
        leading: new IconButton(icon: const Icon(Icons.refresh), onPressed: () {
          get(CodeWarsAPI.getUser(user.username))
            ..then((val) =>
                setState(() {
                  int index = _friendUsers.indexOf(user);
                  _friendUsers.removeAt(index);
                  _friendUsers.insert(index, _json2user(val.body));
                  // TODO add him to the database
                }))
            ..timeout(new Duration(seconds: 10))
            ..catchError(() => setState(_pop));
        },),
        title: new ListTile(
          title: new Text(
            user.name,
  
negative.code:     _allPages = <_Page>[_friends, _kata, _me];
      _tabController = new TabController(vsync: this, length: _allPages.length);
      _tabController.addListener(_handleTabSelection);
      _selectedPage = _allPages.first;
    }
  
    @override
  