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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

In the context of finite state machines, what is XState?

In the context of finite state machines, what is XState?

Managing state as plain JavaScript objects

Implementing complex logic in applications

Using finite state machines to represent global state

What is the primary focus of XState in the context of state management?

What is the primary focus of XState in the context of state management?

Graphical representations of state machines


What can an _actor_ do in the actor model of computation?

What can an actor do in the actor model of computation?

What feature sets XState apart from other state management libraries?

What feature sets XState apart from other state management libraries?

To ensure compatibility with React and prevent excessive rerenders

Why is the `xstate-react` dependency added to the project in the context of using XState with React?

Why is the <code>xstate-react</code> dependency added to the project in the context of using XState with React?

To define a state machine with specific states and transitions

 To handle user login and logout functionality

To interpret user input in a React application

What is the purpose of the `createMachine` function below?
```
export const userFlowMachine = createMachine({

//...

What is the purpose of the <code>createMachine</code> function below?
<pre><code>export const userFlowMachine = createMachine({

//...</code></pre>

It is passed as a prop to child components.

It is consumed by the `useActor` hook to get the current state.


It is responsible for handling user authentication.

How is the `userFlowService` utilized in the React component `SomeComponent` below?
```
export const SomeComponent = (props) => {
  const globalServices = useContext(GlobalStateContext);
  const [state] = useActor(globalServices. userFlowService);
  
    return state.matches('loggedIn') ? 'Logged In' :'Logged Out';
};

How is the <code>userFlowService</code> utilized in the React component <code>SomeComponent</code> below?
<pre><code>export const SomeComponent = (props) =&gt; {
 const globalServices = useContext(GlobalStateContext);
 const [state] = useActor(globalServices. userFlowService);
 
 return state.matches('loggedIn') ? 'Logged In' :'Logged Out';
};</code></pre>

 It is added to handle user interaction manually, and it contains callbacks for loading actions.


It is added to automatically fetch images when the machine is spawned, and it contains a function (`src`) to fetch data from a real endpoint.

It is added to define the success and failure states, and it contains CSS properties for styling.

It is added to manage global state, and it contains a reference to the `fetchImages` function.

Why is the `invoke` property added to the loading state, and what does it contain?



Why is the <code>invoke</code> property added to the loading state, and what does it contain?

 To update the machine's context with the fetched data


 To define the success and failure states

What is the purpose of the `assign` function used in the `invoke` property?

What is the purpose of the <code>assign</code> function used in the <code>invoke</code> property?

It triggers the `MODAL_OPEN` action when the modal is rendered.


It handles the fetching of images from an external source.


It manages the navigation and routing in the app.

What does the `useEffect` hook do below?
```
useEffect(() => {
    send({
      type: "MODAL_OPEN",
      payload: route.params.imageItem,
    });

What does the <code>useEffect</code> hook do below?
<pre><code>useEffect(() =&gt; {
 send({
 type: &quot;MODAL_OPEN&quot;,
 payload: route.params.imageItem,
 });</code></pre>

 To check whether an image is liked or not based on the state

What is the purpose of the `selector` function in XState?

What is the purpose of the <code>selector</code> function in XState?

Test your knowledge about the XState library in this lesson.


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: Untangling Complex Flows with XState