Filtering Sharepoint list data

I'm new to development. I'm struggling with filtering the data related to specific field values in sharepoint list.

 

I'm using angularJs and REST to get the all items from sp list. I need to filter data based on Region, Country and sites in that country.

 

Any help is much appreciated.

 

I'm storing all items in one variable as

 

$scope.items= data.data.d.results;

 

In the data below, Region, Country, Sites and contact are the SharePoint list field names, My data looks something like this:

 

[{"Region":"EU","Country":"Germany","Sites":"Germansite1", "contact":"person1"}, {"Region":"EU","Country":"Spain","Sites":"Spainsite", "contact":"person2"}, {"Region":"EU","Country":"Germany","Sites":"Germansite2", "contact":"person3"}, {"Region":"NA","Country":"USA","Sites":"USsite", "contact":"person4"}, {"Region":"SA","Country":"Mexico","Sites":"Mexsite", "contact":"person5"}, {"Region":"EU","Country":"Hungary","Sites":"Hunsite", "contact":"person6"}, {"Region":"AP","Country":"China","Sites":"Csite", "contact":"person7"}, {"Region":"AP","Country":"Singapore","Sites":"Singaporesite", "contact":"person8"}, {"Region":"AP","Country":"India","Sites":"indiasite", "contact":"person9"}, {"Region":"EU","Country":"Italy","Sites":"ItSite", "contact":"person10"}]

 

I tried doing this:

 

ng-repeat="item in items | filter: {Country:'Singapore'}">{{item.Country}}

  

But if I use filter in this way then, if a new country is added to the list, it won't be filtered.

 

Any help?