Promise sync in angular.

Processing synchronously in angular

      $http.post(<serviceUrl>, json).then(function (res) {
          return $q.when(res);
      }).then(function (res) {
        console.log(res);
        return $q.when(res);
      }).then(function (res) {
        return res
      }).then(function (res) {
        defer.resolve(events);
      });