exporting array data from flex actionscript

Something like this should help you. basically it takes an array, creates a number of header columns, and exports all data in the array:

      private function exportDataGrid(arr:Array):void{
            var exportStr:String = "";
            var delimiter:String = ",";
            var fileName:String;
            fileName = "export.txt";
            exportStr += "Title" + delimiter; 
            exportStr += "Date Created" + delimiter; 
            exportStr += "Cards" + delimiter;

            exportStr += delimiter+delimiter+delimiter+"\n";

            for each(var item:Object in arr){
                exportStr += "\""+item.title+"\""+delimiter;
                exportStr += "\""+item.dateCreated+"\""+delimiter;
                exportStr += "\""+item.numCards+"\"\n";
            }
            var fileReference:FileReference = new FileReference();
            fileReference.save(exportStr, fileName);
        }