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

import { registerRootComponent } from "expo";

import App from "./App";

// registerRootComponent calls AppRegistry.registerComponent('main', () => App);
// It also ensures that whether you load the app in Expo Go or in a native build,
// the environment is set up appropriately
registerRootComponent(App);


import "react-native-gesture-handler";
import React, { useState, useEffect } from "react";
import { NavigationContainer, DefaultTheme } from "@react-navigation/native";
import { createStackNavigator } from "@react-navigation/stack";
import { Login } from "./src/surfaces/Login";
import { Home } from "./src/surfaces/Home";
import { ConversationsNavigation } from "./src/surfaces/ConversationsNavigation";
import { SafeAreaProvider } from "react-native-safe-area-context";
import AppLoading from "expo-app-loading";
import {
  useFonts,
  Poppins_400Regular,
  Poppins_700Bold,
} from "@expo-google-fonts/poppins";
import { requestBase } from "./src/utils/constants";
import { UserListContext } from "./src/context";

const Stack = createStackNavigator();

const MyTheme = {
  ...DefaultTheme,
  colors: {
    ...DefaultTheme.colors,
    background: "rgb(255, 255, 255)",
  },
};

export default function App() {
  const [userLoggedIn, setIsUserLoggedIn] = useState(true);
  const [userList, setUserList] = useState(null);

  let [fontsLoaded] = useFonts({
    Poppins_400Regular,
    Poppins_700Bold,
  });

  async function fetchUserData() {
    const response = await fetch(requestBase + "/users.json");
    setUserList(await response.json());
  }

  useEffect(() => {
    fetchUserData();
  }, []);

  if (!fontsLoaded) {
    return <AppLoading />;
  }

  if (!userList) {
    return <AppLoading />;
  }

  return (
    <SafeAreaProvider>
      <UserListContext.Provider value={{ userList: userList }}>
        <NavigationContainer theme={MyTheme}>
          <Stack.Navigator>
            {!userLoggedIn ? (
              <Stack.Screen name='Login' component={Login} />
            ) : (
              <>
                <Stack.Screen
                  name='Home'
                  component={Home}
                  options={{ headerShown: false }}
                />
                <Stack.Screen
                  name='ConversationsNav'
                  component={ConversationsNavigation}
                  options={{ headerShown: false }}
                />
              </>
            )}
          </Stack.Navigator>
        </NavigationContainer>
      </UserListContext.Provider>
    </SafeAreaProvider>
  );
}


import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


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

Solution: Building the Profile Surface