code: function (userId) {                                                                                  // 1102
      var self = this;                                                                                              // 1103
      // Avoid invalidating dependents if setUserId is called with current value.                                   // 1104
      if (self._userId === userId)                                                                                  // 1105
        return;                                                                                                     // 1106
      self._userId = userId;                                                                                        // 1107
      if (self._userIdDeps)                                                                                         // 1108
        self._userIdDeps.changed();                                                                                 // 1109
    }
docs: 1100 1101