If you haven’t worked with JavaScript in the last few years, these three points should give you enough knowledge to feel comfortable reading the React documentation:
- We define variables with
letandconststatements. For the purposes of the React documentation, you can consider them equivalent tovar. - We use the
classkeyword to define JavaScript classes. There are two things worth remembering about them. Firstly, unlike with objects, you don't need to put commas between class method definitions. Secondly, unlike many other languages with classes, in JavaScript the value ofthisin a method [depends on how it is called](https://developer.mozilla.org/en-US/docs/Web/Jav
