This will throw an alert with the version your browser is using. To get the Javascript version that your browser is using, just set a variable and then try to overwrite it in the next script where you set a language-specific version. How to check Javascript version in the browser The Javascript version 1.4 was intended to work only on Netscape so it is not included in the table below. How many Javascript versions are availableįor now, there are 12 different versions of Javascript. If you want to further read about differences between them there is an interesting debate at the StackOverflow website here: Javascript and others like JScript and ActionScript are all different implementations of ECMAScript. The last ECMA version was published in June 2018. There are nine editions of ECMAScript published. The name ECMAScript was a compromise between the organizations involved in standardizing the language. Several editions of the language standard have been published since then. The Brendan Eich initial programming language was first named Mocha and then changed the name to LiveScript, and finally JavaScript. It is very well supported and interpreted by the most used browsers like Chrome, Firefox, Safari, Internet Explorer, Edge, Opera, and many more. This means it is running on the user’s browser. While var results in a variable with the surrounding function as its scope, the scope of a variable declared using let is only the block it is in.JavaScript is a client-side programming language. You’re used to declaring variables using var. Most of the code samples come with an external “Run this code” link, so that you can see the code and play with it. Thats largely due to different feature sets: the latest versions of the.

If you need to support old versions of browsers that lack many ES6 features, I’ll touch on solutions that might help you start using ES6 today. Modernizr tells you what HTML, CSS and JavaScript features the users browser. Please note that support for these new ECMAScript 6 features is well underway in modern browsers, although support varies. In this article, we’ll discuss a hand-picked selection of ES6 features that you can use in your everyday JavaScript coding. The features have varying degrees of complexity and are useful in both simple scripts and complex applications. It’s the next version of JavaScript, and it has some great new features. You’ve probably heard about ECMAScript 6 (or ES6) already.

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