Forked from: muta244's [最適化 Tips] 変数名の長さによる処理速度の違い diff:98 for文の書き方でパフォーマンス変わるかテスト miniapp forked:0favorite:0lines:115license : MIT License modified : 2011-07-05 08:57:19 Embed Tweet package { import flash.display.Sprite; import flash.events.MouseEvent; import flash.text.TextField; import flash.text.TextFormat; import flash.utils.getTimer; [SWF(backgroundColor=0xFFFFFF, width=465, height=465, frameRate=60)] public class Performance extends Sprite { private static const NUM_STEPS:int = 10000000; private static const sampleArray:Array = (function():Array { var arr:Array = []; for(var i:int = 0; i < NUM_STEPS; ++i) { arr[i] = i; } return arr; })(); private var _field:TextField; private var _time:uint; public function Performance():void { _setup(); _init(); } private function _init():void { _debug( "for文で終了条件となる配列の長さを宣言する場所テスト\n"); _measure("for文の外で宣言", for1); _measure("毎回array.lengthにアクセス", for2); _measure("for文の中?で宣言", for3); _field.appendText('\nインクリメントする位置を後ろに変えてテスト\n\n'); _measure("for文の外で宣言 インクリメント後ろ", for_1); _measure("毎回array.lengthにアクセス インクリメント後ろ", for_2); _measure("for文の中?で宣言 インクリメント後ろ", for_3); _debug("\n結果については言及しませんので, 各自ご判断ください."); } //--------------------------------------------------------------------------------------------- /** * for文の外で宣言 */ private function for1():void { var len:int = sampleArray.length; for (var i:int = 0; i < len; ++i) { } } /** * 毎回array.lengthにアクセス */ private function for2():void { for (var i:int = 0; i < sampleArray.length; ++i) { } } /** * for文の中?で宣言 */ private function for3():void { for (var i:int = 0, len:int = sampleArray.length; i < len; ++i) { } } //--------------------------------------------------------------------------------------------- /** * for文の外で宣言 */ private function for_1():void { var len:int = sampleArray.length; for (var i:int = 0; i < len; i++) { } } /** * 毎回array.lengthにアクセス */ private function for_2():void { for (var i:int = 0; i < sampleArray.length; i++) { } } /** * for文の中?で宣言 */ private function for_3():void { for (var i:int = 0, len:int = sampleArray.length; i < len; i++) { } } //--------------------------------------------------------------------------------------------- private function _measure(title:String, func:Function, ...params):void { _time = getTimer(); func.apply(null, params); _time = getTimer() - _time; _debug("[ " + title + " ] --> " + _time + " ms"); } private function _debug(log:String):void { _field.appendText(log + "\n"); } private function _setup():void { _field = new TextField(); _field.width = stage.stageWidth - 40; _field.height = stage.stageHeight - 60; _field.x = 20; _field.y = 60; var format:TextFormat = _field.defaultTextFormat; format.font = "_typewriter"; _field.defaultTextFormat = format; addChild(_field); var button:Sprite = new Sprite(); button.graphics.lineStyle(1, 0xBBBBBB); button.graphics.beginFill(0xEEEEEE); button.graphics.drawRoundRect(0, 0, 100, 20, 5, 5); button.graphics.endFill(); addChild(button); button.x = 20; button.y = 20; button.mouseChildren = false; button.buttonMode = true; var field:TextField = new TextField(); field.width = 100; field.height = 20; field.htmlText = "<p align='center'><font face='_sans'>再計算</span></p>"; button.addChild(field); button.addEventListener(MouseEvent.CLICK, function ():void { _field.text = ""; _init(); }); } } } Code Fullscreen Preview Fullscreen performance Math.log length mouseChildren apply buttonMode font height width MouseEvent.CLICK TextFormat addEventListener text addChild String Array uint Sprite int