ArrayCollection FilterFunction in-line

AC_filterFunction.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" verticalAlign="middle" backgroundColor="white" creationComplete="init()">
 
    <mx:Script>
        <![CDATA[
            import mx.collections.SortField;
            import mx.collections.Sort;
            import mx.collections.ArrayCollection;
 
            [Bindable]
            private var catFamilyAC:ArrayCollection;
            [inject]private var model:ModelController;
 
             private function init():void {
                var cat:CATDTO;
 
                /* Initialize and populate the ArrayCollection object. */
                catFamilyAC = new ArrayCollection();
                for each (var cat:CatDTO in model.otherArraySourceAC) {
                    catFamilyAC.addItem(cat);
                }
            }

            ...
 
            /** As you can see, inline, I have added a function rather than having to add another function to link it up to */
            /** this one filters for duplicate cat_ids **/
            private function filterAC():void {
                catFamilyAC.filterFunction = function(item:CatDTO):Boolean{
 			return cats[item.CAT_ID] ? true : false;
		 }
            }
 
        ...
        ]]>
    </mx:Script>
 ...
 
</mx:Application>