Forked from:: muta244's [最適化 Tips] オブジェクト生成による処理速度の違い

[最適化 Tips] Array, Vector 走査時のイテレーション方法による処理速度の違い

forked:3
favorite:3
lines:156
license : MIT License
modified : 2009-05-17 17:26:04

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package {

import flash.display.*;
import flash.geom.*;
import flash.events.*;
import flash.text.*;
import flash.utils.*;

public class Main extends Sprite
{
    static private const _NUM_TIMES:uint = 1000000;
    
    private function _init():void
    {
        _debug(
            "各テスト " + _NUM_TIMES + " 回処理させた計算結果 [単位 ： ミリ秒]\n" +
            "(誤差は多少生じます)\n"
        );
        
        var array:Array = [];
        var vector1:Vector.<int> = new Vector.<int>(0, false);
        var vector2:Vector.<int> = new Vector.<int>(_NUM_TIMES, false);
        var vector3:Vector.<int> = new Vector.<int>(_NUM_TIMES, true);
        
        for (var i:uint = 0; i < _NUM_TIMES; i++) {
            array[i] = 0;
            vector1[i] = 0;
        }
        
        _measure("ループのみ", function ():void
        {
            for (var i:int = 0; i < _NUM_TIMES; i++) {
                
            }
        });
        
        _measure("Array を for で処理", function ():void
        {
            var e:int;
            for (var i:uint = 0, l:uint = array.length; i < l; i++) {
                e = array[i];
            }
        });
        
        _measure("Array を for each で処理", function ():void
        {
            for each (var e:int in array) {
                
            }
        });
        
        _measure("Array を forEach で処理", function ():void
        {
            array.forEach(function (e:int, i:int, elements:Array):void
            {
                
            });
        });
        
        _measure("Vector.<int>(0, false) を for で処理", function ():void
        {
            var e:int;
            for (var i:uint = 0, l:uint = vector1.length; i < l; i++) {
                e = vector1[i];
            }
        });
        
        _measure("Vector.<int>(0, false) を for each で処理", function ():void
        {
            for each (var e:int in vector1) {
                
            }
        });
        
        _measure("Vector.<int>(0, false) を forEach で処理", function ():void
        {
            vector1.forEach(function (e:uint, i:uint, elements:Vector.<int>):void
            {
                
            });
        });
        
        _measure("Vector.<int>(" + _NUM_TIMES + ", false) を for で処理", function ():void
        {
            var e:int;
            for (var i:uint = 0, l:uint = vector2.length; i < l; i++) {
                e = vector2[i];
            }
        });
        
        _measure("Vector.<int>(" + _NUM_TIMES + ", false) を for each で処理", function ():void
        {
            for each (var e:uint in vector2) {
                
            }
        });
        
        _measure("Vector.<int>(" + _NUM_TIMES + ", false) を forEach で処理", function ():void
        {
            vector2.forEach(function (e:int, i:int, elements:Vector.<int>):void
            {
                
            });
        });
        
        _measure("Vector.<int>(" + _NUM_TIMES + ", true) を for で処理", function ():void
        {
            var e:int;
            for (var i:uint = 0, l:uint = vector3.length; i < l; i++) {
                e = vector3[i];
            }
        });
        
        _measure("Vector.<int>(" + _NUM_TIMES + ", true) を for each で処理", function ():void
        {
            for each (var e:int in vector3) {
                
            }
        });
        
        _measure("Vector.<int>(" + _NUM_TIMES + ", true) を forEach で処理", function ():void
        {
            vector3.forEach(function (e:int, i:int, elements:Vector.<int>):void
            {
                
            });
        });
        
        _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.");
    }
    
    private var _field:TextField;
    private var _time:uint;
    
    public function Main():void
    {
        _setup();
        _init();
    }
    
    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;
        _field.multiline = true;
        _field.wordWrap = true;
        
        var format:TextFormat = _field.defaultTextFormat;
        format.font = "_sans";
        _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();
        });
    }
}

}

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