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What determines the available ECMAScript version?


By : matador
Date : October 15 2020, 08:10 AM
it fixes the issue It's the JavaScript engine used by the browser: V8 in Chrome, Chromium, and Opera; SpiderMonkey in Firefox; JScript in IE8; and Chakra in IE9+ and Edge (the verson of Chakra in IE9+ is very out-of-date; Edge's is quite up-to-date).
code :


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Java web app - What determines my Servlet API version? Does it get specified in web.xml?


By : Austine Wuncler
Date : March 29 2020, 07:55 AM
Hope this helps I'm using Eclipse EE Juno and my current web application is using Dynamic web modules 2.4. I'm trying to bump the version up to 3.0 but for some reason I'm unable to. when I try to change the version in project facets I get Cannot change version of project facet Dynamic Web Module to 3.0. Is it possible that there some bunk line in my web.xml file that determines this? How do I change the Dynamic web modules version if not from Eclipse project facet setting alone? , Servlet 2.4 in web.xml:
code :
<web-app version="2.4"
  xmlns="http://java.sun.com/xml/ns/j2ee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
    http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<web-app version="3.0"
  xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
    http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

What determines which iOS version my app requires when building?


By : jithin
Date : March 29 2020, 07:55 AM
like below fixes the issue Deployment target is the minimum version you support. SDK Root (or Base SDK in the GUI), is the set of frameworks you use when building. You must be aware tho, that building with SDK 6.0 gives access to many API calls that are not available in 4.0~5.0 etc, you MUST check their availability when using them or you will crash on older Software. You usually check availability of classes using NSClassFromString(@"NewClass"), if it returns nil its not available. To check available of new methods on existing classes, you use [OldClass respondsToSelector:@selector(newMethod:)] If you want to use new Frameworks linked in your project, you must declare them as Weak, or you'll crash on launch on older software

What are the version numbers of JavaScript and what ECMAScript version do they correspond to?


By : Martyn Messerli
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , According to Wikipedia, the JavaScript-specific version numbers were only used by Firefox, and were dropped in Firefox 4.
These days, there's not really such thing as 'the current version of JavaScript' - the ECMAScript standards get created, and the browser vendors implement the features into their JS engines at their own pace. This pace varies wildly - as demonstrated by the very useful Kangax compatibility table.

How to detect ECMAscript version?


By : Aleksandar Kuzmanovs
Date : March 29 2020, 07:55 AM
wish of those help May be you can try to use some data structures that are specifically added in ES6 like Map, Set etc. This is to differentiate between ES5 and ES6 but you can look up for features that are added in ES5 which are not present in ES3 in your case?
code :
try {
  var k = new Map();
  console.log("ES6 supported!!")
} catch(err) {
  console.log("ES6 not supported :(")
}

try {
  var k = new HashMap();
  console.log("ES100 supported!!")
} catch(err) {
  console.log("ES100 not supported :(")
}

Is it possible to set ECMAScript version in Node?


By : Sam
Date : March 29 2020, 07:55 AM
wish helps you All versions of EcmaScript are backwards-compatible with the previous versions.
ES3 features work in ES5, and ES5 features work in ES2015, so there should be no need to specifically run code in an ES3 enviroment, as ES3 code should work fine in ES5 and ES2015.
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