Compatibility with older browsers

While ES6 works with almost all modern browsers, there are still many users who use older versions of Internet Explorer or Firefox. So, how are we going to make our application work for them? Well, the good thing about ES6 is that all it's new features can be implemented using the ES5 specification. This means that we can easily transpile our code to ES5, which will work on all modern browsers. For this purpose, we are going to use Babel: https://babeljs.io/, as the compiler for converting ES6 to ES5.

Remember how, in the beginning of our chapter, we installed Node.js in our system? Well, it's finally time to use it. Before we start compiling our code to ES5, we need to learn about Node and the npm.