Gain insights into state management in React Native, including Redux, MobX, XState, Jotai, and React Query. Explore strategies for data consistency and synchronization across your applications.

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State management is a process of managing an application’s data. As a developer, it is important to ensure data remains consistent and synchronized across different application parts.

You’ll start by learning the state management strategies in React Native using state and props and create a real-world Funbook application using only React Native built-in solutions. You’ll learn about the Redux and MobX libraries and how these can be used to implement the like button in the app. Next, you will implement the like button using the XState library that treats the state as a finite state machine. You’ll also learn about the Jotai library that uses atomic state for state management. Finally, you’ll learn how React Query offers comfortable fetching and data mutation on the server that replaces global state management needs.

After completing this course, you will be equipped to implement complex state management functionalities, ensuring data consistency and synchronization across different application parts.

Simplifying State Management in React Native

```
class ComponentName extends React.Component
```

```
createNewComponent(ComponentName)
```

```
const ComponentName = React.Component
```

In React Native, which function is used to define a new component?

In React Native, which function is used to define a new component?

Which navigation library is being used for React Native?

Which navigation library is being used for React Native?

In the `Conversations` component below, what does the `<View>` element represent?

```
import React from "react";
import { View, Text } from "react-native";
export const Conversations = () => {
 return (
 <View>
 <Text>this will be the chat screen</Text>
 </View> );
};

In the <code>Conversations</code> component below, what does the <code>&lt;View&gt;</code> element represent?
<pre><code>import React from &quot;react&quot;;
import { View, Text } from &quot;react-native&quot;;
export const Conversations = () =&gt; {
 return (
 &lt;View&gt;
 &lt;Text&gt;this will be the chat screen&lt;/Text&gt;
 &lt;/View&gt; );
};</code></pre>

User IDs ensure a cleaner and more reliable solution.

Why might using unique user IDs be a better approach than using image URLs as keys in a list of avatars?

Why might using unique user IDs be a better approach than using image URLs as keys in a list of avatars?

It simplifies data fetching and readability.

It streamlines data retrieval efficiency.

Why should we use user IDs in data files for a real-world app?

Why should we use user IDs in data files for a real-world app?

We have the following JSON file: 
```Javascript
[
  {
    "id": 1,
    "name": "Malena Tudi",
    "url": "https://raw.githubusercontent.com/PacktPublishing/Simplifying-State-Management-in-React-Native/cd04c474053275d4e22a8173695a2b972d012567/chapter-4/assets/avatars/1.png"
  },
  {
    "id": 2,
    "name": "Jakob Curtis",
    "url": "https://raw.githubusercontent.com/PacktPublishing/Simplifying-State-Management-in-React-Native/cd04c474053275d4e22a8173695a2b972d012567/chapter-4/assets/avatars/2.png"
  },
  {
    "id": 3,
    "name": "John Doe",
    "url": "https://raw.githubusercontent.com/PacktPublishing/Simplifying-State-Management-in-React-Native/cd04c474053275d4e22a8173695a2b972d012567/chapter-4/assets/avatars/3.png"
  }]
```
If we wanted to access the avatar URL of the user named "Jakob Curtis," what code would we use?

We have the following JSON file:
<pre><code class="language-Javascript">[
 {
 &quot;id&quot;: 1,
 &quot;name&quot;: &quot;Malena Tudi&quot;,
 &quot;url&quot;: &quot;https://raw.githubusercontent.com/PacktPublishing/Simplifying-State-Management-in-React-Native/cd04c474053275d4e22a8173695a2b972d012567/chapter-4/assets/avatars/1.png&quot;
 },
 {
 &quot;id&quot;: 2,
 &quot;name&quot;: &quot;Jakob Curtis&quot;,
 &quot;url&quot;: &quot;https://raw.githubusercontent.com/PacktPublishing/Simplifying-State-Management-in-React-Native/cd04c474053275d4e22a8173695a2b972d012567/chapter-4/assets/avatars/2.png&quot;
 },
 {
 &quot;id&quot;: 3,
 &quot;name&quot;: &quot;John Doe&quot;,
 &quot;url&quot;: &quot;https://raw.githubusercontent.com/PacktPublishing/Simplifying-State-Management-in-React-Native/cd04c474053275d4e22a8173695a2b972d012567/chapter-4/assets/avatars/3.png&quot;
 }]
</code></pre>
If we wanted to access the avatar URL of the user named “Jakob Curtis,” what code would we use?

To customize the appearance of a tab in the bottom tab navigator, which component should you use from the `@expo/vector-icons` library?

To customize the appearance of a tab in the bottom tab navigator, which component should you use from the <code>@expo/vector-icons</code> library?

By using the `<SafeAreaView>` component and setting `paddingTop` to the header height

How can you ensure that the content of your app is displayed below the header?


How can you ensure that the content of your app is displayed below the header?

What React Navigation hook can be used to determine the height of the header?


What React Navigation hook can be used to determine the height of the header?

What hook should you use to load fonts and add them to your React Native app?


What hook should you use to load fonts and add them to your React Native app?

Test your understanding of the concepts you have learned in this section.


Quiz: Creating a Real Working App

Test your understanding of the concepts you have learned in this section.

Before We Begin

What Are React and React Native?

Managing State in a Simple React App

Planning and Setting Up the Funbook App

Styling and Populating the Funbook App

Implementing Redux in Our Funbook App

Using MobX as a State Manager in a React Native App

Untangling Complex Flows in React Native Apps with XState

Integrating Jotai in a React Native App

Using React Query for Server-Side-Driven State Management

Conclusion

Appendix

Build an E-Commerce App with React Native, Redux, and Firebase

Quiz: Creating a Real Working App