How to get unique/Distinct data from store?

[Rameshlamani]

Hi, i am using the extjs. i need to retrieve distinct data from store as per requirement. In my store contains single list not nested list in that have regions like AMERICAS , North Sea and SE Asia. these region it self have subRegion,vesselName and vesselType values. I need to retrive unique value based on region, bacasue it contains many duplicate records. I have tried like as below, but it is not working me. Can anybody tel me how to achieve ?. great appreciated. Thank you.

 var vesselStore=Ext.getStore('VesselStatusReportStore');
        var arr=new Array();
        var obj;      
        vesselStore.each(function(rec,index)
        {
            obj=new Object();
            if(rec.get('region')=='AMERICAS'){
                obj.subRegionAmerica=rec.get('subRegion');
                obj.vesselNameAmerica=rec.get('vesselName');
                obj.vesselTypeAmerica=rec.get('vesselType');
            }
            if(rec.get('region')=='NorthSea'){
                obj.subRegionNorthSea=rec.get('subRegion');
                obj.vesselNameNorthSea=rec.get('vesselName');
                obj.vesselTypeNorthSea=rec.get('vesselType');
            }
            if(rec.get('region')=='SE Asia'){
                obj.subRegionSEAsia=rec.get('subRegion');
                obj.vesselNameSEAsia=rec.get('vesselName');
                obj.vesselTypeSEAsia=rec.get('vesselType');
            }
            arr.push(obj);
            console.log(obj);
        });

My Json Data:

[ { 
    "region" : "AMERICAS",
    "startDate" : null,
    "subRegion" : "US",
    "vesselName" : "Thoma-Sea � Hull #147",
    "vesselType" : "PSV"
  },
  { 
    "region" : "AMERICAS",
    "startDate" : null,
    "subRegion" : "US",
    "vesselName" : "Thoma-Sea � Hull #148",
    "vesselType" : "PSV"
  },
  { 
    "region" : "AMERICAS",
    "startDate" : null,
    "subRegion" : "Mexico",
    "vesselName" : "Thoma-Sea � Hull #148",
    "vesselType" : "PSV"
  }]

[Legolas]

I need to retrive unique value based on region, bacasue it contains many duplicate records

Hi Rameshlamani, you may use the method collect.

[Rameshlamani]

Thank you. For your reply