In the previous chapter, we set up our working environment with many tools that we will be using throughout this book. In this chapter, we will get ourselves prepared for the rest of this book, and we will be considering some interesting and powerful modern features of JavaScript that can you help be more effective and write better code.
We will be considering several new language features that will come handy—but definitely not everything! JS has really grown into a big language, and there are some features that you're not likely to ever need. From the very start, we will also work more seriously with Flow, aiming to forego the usage of untyped JS, for a safer way of developing code.
It may be important to highlight that JS has evolved through the years, and that there isn't a single standard version. The most recent one is (formally) called ECMAScript...
