Looping over each item in an Array in ActionScript 3.0

The following example shows how you can loop over an Array object and modify items using the Array class’s forEach() method.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/04/21/looping-over-each-item-in-an-array-in-actionscript-30/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.utils.ObjectUtil;

            private function init():void {
                beforeTextArea.text = ObjectUtil.toString(dp);
                dp.forEach(forEach_test);
                dataGrid.dataProvider = dp;
                afterTextArea.text = ObjectUtil.toString(dp);
            }

            private function forEach_test(element:*, index:int, arr:Array):void {
                element.lbl = element.name + " (" + element.abbr + ")";
                element.idx = index;
            }
        ]]>
    </mx:Script>

    <mx:Array id="dp">
        <mx:Object name="Baltimore Orioles" abbr="BAL" />
        <mx:Object name="Boston Red Sox" abbr="BOS" />
        <mx:Object name="Chicago White Sox" abbr="CWS" />
        <mx:Object name="Cleveland Indians" abbr="CLE" />
        <mx:Object name="Detroit Tigers" abbr="DET" />
        <mx:Object name="Kansas City Royals" abbr="KC" />
        <mx:Object name="Los Angeles Angels of Anaheim" abbr="LAA" />
        <mx:Object name="Minnesota Twins" abbr="MIN" />
        <mx:Object name="New York Yankees" abbr="NYY" />
        <mx:Object name="Oakland Athletics" abbr="OAK" />
        <mx:Object name="Seattle Mariners" abbr="SEA" />
        <mx:Object name="Tampa Bay Devil Rays" abbr="TB" />
        <mx:Object name="Texas Rangers" abbr="TEX" />
        <mx:Object name="Toronto Blue Jays" abbr="TOR" />
    </mx:Array>

    <mx:DataGrid id="dataGrid"
            verticalScrollPolicy="on"
            width="100%">
        <mx:columns>
            <mx:DataGridColumn dataField="name" />
            <mx:DataGridColumn dataField="abbr" width="80" />
            <mx:DataGridColumn dataField="lbl" />
            <mx:DataGridColumn dataField="idx" width="40" textAlign="right" />
        </mx:columns>
    </mx:DataGrid>

    <mx:Form width="100%" height="100%">
        <mx:FormItem label="Before:" width="100%" height="50%">
            <mx:TextArea id="beforeTextArea"
                    editable="false"
                    wordWrap="false"
                    width="100%"
                    height="100%" />
        </mx:FormItem>
        <mx:FormItem label="After:" width="100%" height="50%">
            <mx:TextArea id="afterTextArea"
                    editable="false"
                    wordWrap="false"
                    width="100%"
                    height="100%" />
        </mx:FormItem>
    </mx:Form>

</mx:Application>

View source is enabled in the following example.

Tagged as: forEach()