Using the different features of Jotai

So far, we've learned some basics of the Jotai library. There are some more basic features that we will cover in this section. These features are necessary if you need to deal with complex scenarios. We'll also briefly introduce some advanced features whose use cases are out of the scope of this book.

In this section, we'll discuss the following topics:

• Defining the write function of atoms
• Using action atoms
• Understanding the onMount option of atoms
• Introducing the jotai/utils bundle
• Understanding library usage
• Introduction to more advanced features

Let's take a look at each one now.

Defining the write function of atoms

We have seen how to create a derived atom. For example, doubledCountAtom with countAtom is defined in the Understanding how Jotai works to store atom values section, as follows:

const countAtom = atom(0);
const doubledCountAtom = atom(
  (get) => get...