What's ES2016?
One of the main changes in this edition is the emphasis on ES2016, the most modern version of JavaScript currently available. Formerly known as ES6 (Harmony), it pushes the JavaScript language's features forward significantly, allowing for new usage patterns that simplify code readability and increase expressiveness. If you've written JavaScript before and the examples in this chapter look pretty confusing, it means you're probably familiar with the older, more common ES5 syntax. But don't sweat! It really doesn't take too long to get the hang of the new syntax, and I will try to explain the new language features as we encounter them. Although it might seem a somewhat steep learning curve at the start, by the end, you'll have improved ...
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