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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

To manage cached values and refreshing values

What is the purpose of `QueryClientProvider` in React Query?

What is the purpose of <code>QueryClientProvider</code> in React Query?

Comfortable fetching and data mutations on the server


What does React Query primarily offer as a solution?

What does React Query primarily offer as a solution?

Cached values, refreshing values, and background fetching


What additional functionalities does React Query provide besides data fetching?

What additional functionalities does React Query provide besides data fetching?

The query parameter for fetching the login status


The key to access previously fetched data

In the `useCustomImageQuery` hook, what does the query key `loginState` represent?
```
export const useCustomImageQuery = () => {
  const { data } = useQuery(['loginState']);
  return useQuery(
    ["imageList"],
    getImages,
    {
    enabled: data?.loggedIn,
  });

In the <code>useCustomImageQuery</code> hook, what does the query key <code>loginState</code> represent?
<pre><code>export const useCustomImageQuery = () =&gt; {
 const { data } = useQuery(['loginState']);
 return useQuery(
 [&quot;imageList&quot;],
 getImages,
 {
 enabled: data?.loggedIn,
 });</code></pre>

To determine when the query should be called

What is the purpose of the `enabled` key in the `useCustomImageQuery` hook configuration object?
```
export const useCustomImageQuery = () => {
  const { data } = useQuery(['loginState']);
  return useQuery(
    ["imageList"],
    getImages,
    {
    enabled: data?.loggedIn,
  });

What is the purpose of the <code>enabled</code> key in the <code>useCustomImageQuery</code> hook configuration object?
<pre><code>export const useCustomImageQuery = () =&gt; {
 const { data } = useQuery(['loginState']);
 return useQuery(
 [&quot;imageList&quot;],
 getImages,
 {
 enabled: data?.loggedIn,
 });</code></pre>

To mutate data on the server, which hook is used?

To mutate data on the server, which hook is used?

Which state is _not_ a valid state in the context of the `useMutation` hook?

Which state is not a valid state in the context of the <code>useMutation</code> hook?

To update the cached version of data after mutation


What is the purpose of the `onSuccess` callback in the `useMutation` configuration object?
```
const imageListMutation = useMutation(updateImges, {
   onSuccess: data => {
    queryClient.setQueryData(['imageList'], data)
  }

What is the purpose of the <code>onSuccess</code> callback in the <code>useMutation</code> configuration object?
<pre><code>const imageListMutation = useMutation(updateImges, {
 onSuccess: data =&gt; {
 queryClient.setQueryData(['imageList'], data)
 }</code></pre>

Which React Query utility can be used to refetch data when the app is focused in a React Native app?

Which React Query utility can be used to refetch data when the app is focused in a React Native app?

Test your knowledge on how to use React Query for server-side-driven state management. 


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

Quiz: Using React Query for Server-Side-Driven State Management