NOTES − In all chapters, we will use the class syntax for stateful (container) components and function syntax for stateless (presentational) components. We will learn more about components in our next chapter.

We will also learn how to use the arrow function syntax for updateState. You should keep in mind that this syntax uses the lexical scope, and this keyword will be bound to the environment object (Class). This will sometimes lead to unexpected behavior.

The other way to define methods is to use the EC5 functions but in that case we will need to bind this manually in the constructor. Consider the following example to understand this.