StringBuilder in Flex

I'm looking for fast string concatenation class or 开发者_运维问答so in Flex. Like StringBuilder in Java.

Thanks

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var str1:String = "Vinoth";
var str2:String = "Babu";
var str3:String = "Chennai";
var str4:String = concat(str1, " ", str2, " ", str3)

trace(str4) would result you str4 == "Vinoth babu Chennai"

String Concat Class

public class StringBuffer
{
    public var buffer:Array = new Array();

    public function add(str:String):void
    {
        for (var i:Number = 0; i < str.length; i++)
        {
            buffer.push(str.charCodeAt(i));
        }
    }

    public function toString():String
    {
        return String.fromCharCode.apply(this, buffer);
    }
}

Here you have a more indepth than the above class written.

http://blogs.adobe.com/pfarland/2007/10/avoiding_string_concatenation.html

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You can create an array of strings and then use String.concat to combine them.

However, I've never seen string manipulation come up as a bottleneck when profiling a Flex app. I have in .NET, but not Flex.