Adobe Flex 3, unable to check existing XML nodes

Question

I am getting an XML data from server(Pls refer xmlData value). I need to: i. Create another XML with non-duplicates Folders ii. Create another XML with final count on monthly basis.
I am unable to do this with below code and getting duplicate records.
private var xmlData:XML = new XML("<root><SUMMARY_RECORD><FOLDER>Folder1</FOLDER><COUNT>100</COUNT><MONTH>Feb</MONTH><QUARTER>Q1</QUARTER><YEAR>2014</YEAR></SUMMARY_RECORD><SUMMARY_RECORD><FOLDER>Folder1</FOLDER><COUNT>100</COUNT><MONTH>Feb</MONTH><QUARTER>Q1</QUARTER><YEAR>2014</YEAR></SUMMARY_RECORD></root>");
    var folderDataXML:XML = new XML("<root></root>");
    var folderDGDataXML:XML = new XML("<root></root>");
    private function loaded():void{
        var item:XML;
        folderDGDataXML.appendChild(new XML("<FOLDER_NAME><Name>ALL</Name></FOLDER_NAME>"));
        for each (item in xmlData.SUMMARY_RECORD){
            if (folderDGDataXML.FOLDER_NAME.(Name==item.FOLDER).toString() == ""){
                folderDGDataXML.appendChild(new XML("<FOLDER_NAME><Name>"+item.FOLDER+"</Name></FOLDER_NAME>"));
            if (folderDataXML.SUMMARY_RECORD.(Name==item.MONTH).toXMLString() == ""){
                folderDataXML.appendChild(new XML("<SUMMARY_RECORD><Name>"+item.MONTH+"</Name><COUNT>"+item.COUNT+"</COUNT></SUMMARY_RECORD>"));
            }else{
                var count:int = Number(folderDataXML.SUMMARY_RECORD.(Name==item.MONTH).COUNT) + Number(item.COUNT);
                folderDataXML.SUMMARY_RECORD.(Name==item.MONTH).COUNT = count;
Final output:
folderDGDataXML:   
<root>
  <FOLDER_NAME>
    <Name>ALL</Name>
  </FOLDER_NAME>
  <FOLDER_NAME>
    <Name>Folder1</Name>
  </FOLDER_NAME>
  <FOLDER_NAME>
    <Name>Folder1</Name>
  </FOLDER_NAME>
</root>
folderDataXML: 
<root>
  <SUMMARY_RECORD>
    <Name>Feb</Name>
    <COUNT>100</COUNT>
  </SUMMARY_RECORD>
  <SUMMARY_RECORD>
    <Name>Feb</Name>
    <COUNT>100</COUNT>
  </SUMMARY_RECORD>
</root>
Can you please help me where I am doing wrong? After getting correct XML, I need to populate datagrid & column chart.
Thanks in advance for the help.
Regards
Pavan

Answer 1

Most loops that eliminate duplicates keep a list/map of the data that has already been processed and compares the loop value against that.
In ActionScript, it is more efficient to use a map which is usually a plain object.
var alreadySeenFolders:Map = {};
In the loop you compare:
    var folderName:String = item.FOLDER.toString();
    if (alreadySeenFolders[folderName] == 1)
        continue; // was already in map
    alreadySeenFolders[folderName] = 1; // store it in map