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Filter and refresh function for ArrayCollection

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"     backgroundColor="white">     <mx:Script>                  import mx.collections.ArrayCollection;         [Bindable]         public var salesAC:ArrayCollection = new ArrayCollection([             {name:"A",value:1},             {name:"B",value:2},             {name:"C",value:3},             {name:"D",value:4},             {name:"E",value:5},             {name:"F",value:6}         ]);         public function filterFunc(item:Object):Boolean         {             if(item.value >= salesRange.values[0] && item.value <=  salesRange.values[1])                 return true;             else                 return false;         }         public function filterSales():void         {             salesAC.filterFunction=filterFunc;             salesAC.refresh();         }            </mx:Script>     <mx:Panel width="400" height="300" title="Sales Dashboard">         <mx:HSlider change="filterSales()"                     id="salesRange"                     width="100%"                     thumbCount="2"                     labels="['0','2','5','7','10']"                     tickInterval="1"                      height="50"                      maximum="10"/>         <mx:DataGrid id="dg" width="100%" height="100%" dataProvider="{salesAC}">             <mx:columns>                 <mx:DataGridColumn headerText="Country" dataField="name" />                 <mx:DataGridColumn headerText="Revenue" dataField="value" />             </mx:columns>         </mx:DataGrid>     </mx:Panel> </mx:Application>