Remove Duplicates from an Array AS3

I recently needed function that would remove duplicate values from an array. After looking around online and modifying what I found to fit my needs I came up with the following:

var arr:Array = ["a", "b", "c", "a", "d", "a", "a"];

removeDuplicates(arr);

trace(arr);

function removeDuplicates(target:Array):void
{
	for(var i:uint=target.length; i>0; i--)
	{
		if(target.indexOf(target[i-1]) != i-1)
		{
			target.splice(i-1, 1);
		}
	}
}

If you are searching for a way to do this, I hope this helps!