How to call function in angularjs factory

this is my factory and i want to call getData in saveData.Here is my code

.factory('dataSyncOperation', function($q,$http){
return {
    getData:function(){
        var q = $q.defer();
         var config = {
                    headers : {
                        'Content-Type': 'application/json'
                    }
                }
         $http.get(api+'/sync/').then(function(response){
            q.resolve(response);
        },function(error){
            q.reject();
        })
        return q.promise;

    },

    saveData:function(){

    }

}

}); How can i use the promise returned by getData into saveData.

You can always do, something like this -

saveData:function(){
  this.getData().then(function(response){ // you can handle getData promise here
     // on success 
  }, function(reject){
     // on failure
  });
}

inside your saveData method, let me know if this is what something you are looking for.

Working Example - http://plnkr.co/edit/y8WZQT8SvOAWpKj8Jgxs?p=preview

Code -

// Code goes here

var myApp = angular.module('myApp', []);

myApp.controller('mainCtrl', function($scope, testService){
  testService.saveData().then(function(res){
    $scope.test = res.data;  
  });
})

myApp.factory('testService', function($q, $http){
  return {
      getData:function(){
        var q = $q.defer();
        $http.get('data.json').then(function(response){
          q.resolve(response);
        }, function(error){
            q.reject();
        })
        return q.promise;
      },
      saveData:function(){
        return this.getData();
      }
  }
})