code: function checkSwitch(k, trueFnName, falseFnName) {
        var obj_k = obj[k];
  
        if (obj_k != null && obj_k !== p[k]) {
          if (obj_k) {
            ele[trueFnName]();
          } else {
            ele[falseFnName]();
          }
        }
      }
docs: ignore group -- immutable