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https://issues.apache.org/jira/browse/FLEX-35330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061886#comment-16061886
]
Piotr Zarzycki edited comment on FLEX-35330 at 6/24/17 9:46 AM:
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*MacOS Sierra 10.12.5*
*Chrome 59.0.3071.109 64 bit:*
Uninitialised != : 33
Uninitialised !== : 19
Null initialised != : 14
Null initialised !== : 19
Uninitialised != : 15
Uninitialised !== : 12
Null initialised != : 8
Null initialised !== : 10
Uninitialised != : 15
Uninitialised !== : 11
Null initialised != : 8
Null initialised !== : 10
Uninitialised != : 14
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Null initialised != : 7
Null initialised !== : 10
Uninitialised != : 15
Uninitialised !== : 12
Null initialised != : 9
Null initialised !== : 10
*Firefox 54.0 (64 bit):*
Uninitialised != : 5
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Uninitialised != : 5
Uninitialised !== : 8
Null initialised != : 10
Null initialised !== : 6
Uninitialised != : 6
Uninitialised !== : 8
Null initialised != : 6
Null initialised !== : 7
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Null initialised != : 8
Null initialised !== : 7
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*Safari (10.1.1):*
Uninitialised != : 24
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Null initialised != : 12
Null initialised !== : 13
Uninitialised != : 12
Uninitialised !== : 10
Null initialised != : 10
Null initialised !== : 13
Uninitialised != : 7
Uninitialised !== : 10
Null initialised != : 12
Null initialised !== : 12
Uninitialised != : 9
Uninitialised !== : 10
Null initialised != : 10
Null initialised !== : 13
Uninitialised != : 7
Uninitialised !== : 12
Null initialised != : 13
Null initialised !== : 13
was (Author: pete21):
*MacOS Sierra 10.12.5*
*Chrome 59.0.3071.109 64 bit:*
Uninitialised != : 33
Uninitialised !== : 19
Null initialised != : 14
Null initialised !== : 19
Uninitialised != : 15
Uninitialised !== : 12
Null initialised != : 8
Null initialised !== : 10
Uninitialised != : 15
Uninitialised !== : 11
Null initialised != : 8
Null initialised !== : 10
Uninitialised != : 14
Uninitialised !== : 14
Null initialised != : 7
Null initialised !== : 10
Uninitialised != : 15
Uninitialised !== : 12
Null initialised != : 9
Null initialised !== : 10
*Firefox 54.0 (64 bit):*
Uninitialised != : 5
Uninitialised !== : 6
Null initialised != : 4
Null initialised !== : 7
Uninitialised != : 5
Uninitialised !== : 8
Null initialised != : 10
Null initialised !== : 6
Uninitialised != : 6
Uninitialised !== : 8
Null initialised != : 6
Null initialised !== : 7
Uninitialised != : 5
Uninitialised !== : 9
Null initialised != : 8
Null initialised !== : 7
Uninitialised != : 6
Uninitialised !== : 8
Null initialised != : 6
Null initialised !== : 7
*Safari :*
Uninitialised != : 24
Uninitialised !== : 18
Null initialised != : 12
Null initialised !== : 13
Uninitialised != : 12
Uninitialised !== : 10
Null initialised != : 10
Null initialised !== : 13
Uninitialised != : 7
Uninitialised !== : 10
Null initialised != : 12
Null initialised !== : 12
Uninitialised != : 9
Uninitialised !== : 10
Null initialised != : 10
Null initialised !== : 13
Uninitialised != : 7
Uninitialised !== : 12
Null initialised != : 13
Null initialised !== : 13
> [FlexJS] comparison of objects using non strict inequality or non strict
> equality is slow
> -----------------------------------------------------------------------------------------
>
> Key: FLEX-35330
> URL: https://issues.apache.org/jira/browse/FLEX-35330
> Project: Apache Flex
> Issue Type: Bug
> Affects Versions: Apache FlexJS 0.7.0
> Reporter: Justin Mclean
>
> Code use to test:
> {code}
> <?xml version="1.0" encoding="utf-8"?>
> <js:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
> xmlns:js="library://ns.apache.org/flexjs/basic"
> applicationComplete="init()">
> <js:valuesImpl>
> <js:SimpleCSSValuesImpl/>
> </js:valuesImpl>
> <fx:Script><![CDATA[
> protected function init():void
> {
> var start:Date;
> var end:Date;
> var took:Number;
> var obj1:Object;
> var obj2:Object;
> var obj3:Object = null;
> var obj4:Object = null;
> var i:int;
> var j:int;
> j = 0;
> start = new Date();
> for (i = 0; i < 1e7; i++) {
> if (obj1 != null) {
> j++;
> }
> }
> end = new Date();
> took = end.getTime() - start.getTime();
> trace("Uninitialised != : " + took);
> j = 0;
> start = new Date();
> for (i = 0; i < 1e7; i++) {
> if (obj2 !== null) {
> j++;
> }
> }
> end = new Date();
> took = end.getTime() - start.getTime();
> trace("Uninitialised !== : " + took);
> j = 0;
> start = new Date();
> for (i = 0; i < 1e7; i++) {
> if (obj3 != null) {
> j++;
> }
> }
> end = new Date();
> took = end.getTime() - start.getTime();
> trace("Null initialised != : " + took);
> j = 0;
> start = new Date();
> for (i = 0; i < 1e7; i++) {
> if (obj4 !== undefined) {
> j++;
> }
> }
> end = new Date();
> took = end.getTime() - start.getTime();
> trace("Null initialised !== : " + took);
> }
> ]]></fx:Script>
> <js:initialView>
> <js:View percentWidth="100" percentHeight="100">
> <js:Label id="result" />
> </js:View>
> </js:initialView>
> </js:Application>
> {code}
> Output of 5 consecutive tests:
> Uninitialised != : 18
> Uninitialised !== : 18
> Null initialised != : 16
> Null initialised !== : 13
> Uninitialised != : 20
> Uninitialised !== : 18
> Null initialised != : 17
> Null initialised !== : 14
> Uninitialised != : 18
> Uninitialised !== : 19
> Null initialised != : 16
> Null initialised !== : 14
> Uninitialised != : 18
> Uninitialised !== : 18
> Null initialised != : 16
> Null initialised !== : 14
> Uninitialised != : 19
> Uninitialised !== : 18
> Null initialised != : 17
> Null initialised !== : 14
> Smaller numbers are faster. Run on Chrome 55 on OSX.
> You can see about a 35% performance increase.
> Note there is also a small performance increase in use non strict inequality
> and assigning to null.
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