Comparing if statement with ?: operator

by Fumio 
The conditional operator ?: is basically faster than the if statement.  As to the exception see an article in JActionScripters:

"When to use the ?: conditional operator"
http://blog.jactionscripters.com/2011/02/09/when-to-use-the-conditional-operator/

条件演算子?:は、基本的にはifステートメントより処理は速いようです。そうでない場合については、F-siteの記事をご参照ください。

F-site「条件演算子?:はいつ使うとよいか」
http://f-site.org/articles/2011/02/09113238.html
♥0 | Line 71 | Modified 2011-02-11 15:09:39 | MIT License
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ActionScript3 source code

/**
 * Copyright Fumio ( http://wonderfl.net/user/Fumio )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/noWZ
 */

package {
	import flash.display.Sprite;
	import flash.utils.getTimer;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFormat;
	import flash.text.TextFormatAlign;
	[SWF(width = "240",height = "180")]
	public class Test_if_vs_conditional_operator extends Sprite {
		private const MAX_NUMBER:uint = 10000000;
		private var testData:Vector.<int>  = new Vector.<int>(MAX_NUMBER);
		private var my_txt:TextField = new TextField();
		private var label_txt:TextField = new TextField();
		private var my_fmt:TextFormat = new TextFormat();
		public function Test_if_vs_conditional_operator() {
			// Creating a TextField for display
			createTextField();
			setData();
			warmingUp();
			// Starting Test
			test_if();
			test_conditional_operator();
		}
		private function warmingUp():void {
			var temp:Boolean;
			var started:int = getTimer();
			for (var i:uint = 0; i < MAX_NUMBER; i++) {
				var n:int = testData[i];
				temp = true;
			}
		}
		private function test_if():void {
			var temp:Boolean;
			var started:int = getTimer();
			for (var i:uint = 0; i < MAX_NUMBER; i++) {
				var n:int = testData[i];
				if ((n > 0)) {
					temp = true;
				} else {
					temp = false;
				}
			}
			xTrace("if", getTimer() - started);
		}
		private function test_conditional_operator():void {
			var temp:Boolean;
			var started:int = getTimer();
			for (var i:uint = 0; i < MAX_NUMBER; i++) {
				var n:int = testData[i];
				temp = (n > 0) ? true : false;
			}
			xTrace("?: operator", getTimer() - started);
		}
		private function setData():void {
			for (var i:uint = 0; i < MAX_NUMBER; i++) {
				testData[i] = Math.pow(-1,i);
			}
		}
		private function createTextField():void {
			addChild(my_txt);
			addChild(label_txt);
			my_fmt.align = TextFormatAlign.RIGHT;
			my_txt.x +=  50;
			my_txt.defaultTextFormat = my_fmt;
			my_txt.autoSize = TextFieldAutoSize.RIGHT;
			label_txt.autoSize = TextFieldAutoSize.LEFT;
		}
		private function xTrace(_str:String,n:int):void {
			my_txt.appendText(String(n) + "\n");
			label_txt.appendText(_str + ":" + "\n");
		}
	}
}

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