ECMAScript 6 is the preferred JavaScript version When it comes to the preferred versions of JavaScript, ECMAScript 6, aka ECMAScript 2015, remains the most popular, followed by TypeScript.

I’m just talking about JavaScript 6 at the moment. I believe Firefox has implemented let, which is the replacement for var. Proxies made their way again into an experimental flag in Chrome.

Another interesting new concept in ES6 called Modules is something that JavaScript developers have been using for years. Some projects, like Webpack, let you take advantage of modularization now.