In this chapter, we saw why component-based design is good. We saw what simple React components look like. We saw a few interesting differences between ES5 and ES6, and we also saw how those differences influence React components.
We also saw a few ways to make ES6 code work in an ES5-compatible way. We can write cutting-edge code that works on common browsers. We can even bundle that code into single, efficient files, or debug it live in a browser.
In the next chapter, we're going to look at some intricacies of state and properties. We'll begin by creating reusable React components to use in our example application.