There have been several versions of JavaScript programming language. ECMAScript version 3 was the most supported version between 2000 and 2010. Version 4 planned a number of radical improvements and extensions to the language, but it wasn’t done. Then version 5 came out, which made only some uncontroversial improvements, coming out in 2009. Version 6 came out in 2015 and had major updates that included some of the ideas planned for version 4.
Since then JavaScript had new, small updates every year. The fact that JavaScript is evolving means that browsers have to continually keep up. You should know that an older browser may not support every feature offered by JavaScript.
The designers of JavaScript are careful to not make any major changes that could break existing programs. This is done to allow new browsers run old programs. JavaScript is not only used on platforms like Web browsers. Databases like MongoDB and CouchDB, use JavaScript as their scripting and query language. Several platforms for desktop and server programming provide an environment for programming JavaScript outside of the browser (for example Node JS).
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