package {
	import flash.display.Sprite;
	import __AS3__.vec.Vector;

	public class VectorPerformance extends Sprite
	{
		private static const LENGTH:int = 5000000;

		public function VectorPerformance()
		{
			//vector performance
			var vectorStartTime:Number = getTime();

			var v:Vector.<Number> = generateVector();
			var vAvg:Number = averageVector(v);

			var vectorTime:Number = (getTime() - vectorStartTime) / 1000;

			//array performance
			var arrayStartTime:Number = getTime();

			var a:Array = generateArray();
			var aAvg:Number = averageArray(a);

			var arrayTime:Number = (getTime() - arrayStartTime) / 1000;

			trace("Vector", vectorTime);
			trace("Array", arrayTime);
			trace((vectorTime/arrayTime) * 100 + " %");
		}

		private function generateVector():Vector.<Number>
		{
			var v:Vector.<Number> = new Vector.<Number>(LENGTH, true);

			for(var i:int = 0; i < LENGTH; i++)
			{
				v[i] = Math.random() * 100000;
			}

			return v;
		}

		private function averageVector(v:Vector.<Number>):Number
		{
			var sum:Number = 0;
			var len:int = v.length;

			for(var i:int = 0; i < LENGTH; i++)
			{
				sum += v[i];
			}

			return (sum / len);
		}

		private function generateArray():Array
		{
			var a:Array = new Array(LENGTH);

			for(var i:int = 0; i < LENGTH; i++)
			{
				a[i] = Math.random() * 100000;
			}

			return a;
		}

		private function averageArray(arr:Array):Number
		{
			var sum:Number = 0;
			var len:int = arr.length;

			for(var i:int = 0; i < LENGTH; i++)
			{
				sum += arr[i];
			}

			return (sum / len);
		}		

		private function getTime():Number
		{
			return (new Date()).getTime();
		}
	}
}