Can you show a step-by-step guide to integrating Unstated Next with an existing React app

Step 1: Install Unstated Next

1. Open your terminal and navigate to your React project directory.
2. Install Unstated Next using npm or yarn:

bash
   npm install unstated-next
   # or
   yarn add unstated-next
   

Step 2: Create a State Container

1. Create a new file for your state container. For example, `counter.js`:

javascript
   import { createContainer } from 'unstated-next';

   function useCounter() {
     const [count, setCount] = useState(0);

     const increment = () => setCount(count + 1);
     const decrement = () => setCount(count - 1);

     return { count, increment, decrement };
   }

   const CounterContainer = createContainer(useCounter);

   export { CounterContainer };
   

Step 3: Use the State Container

1. In your React components, use the `useContainer` method to access the state and actions from the `CounterContainer`:

javascript
   import React from 'react';
   import { useContainer } from 'unstated-next';
   import { CounterContainer } from './counter';

   function CounterDisplay() {
     const { count } = useContainer(CounterContainer);
     return <p>Count: {count}</p>;
   }

   function CounterControls() {
     const { increment, decrement } = useContainer(CounterContainer);
     return (
       <div>
         <button onClick={decrement}>-</button>
         <button onClick={increment}>+</button>
       </div>
     );
   }

   function App() {
     return (
       <CounterContainer.Provider>
         <CounterDisplay />
         <CounterControls />
       </CounterContainer.Provider>
     );
   }

   export default App;
   

Step 4: Update Your App

1. Update your `index.js` file to include the `App` component:

javascript
   import React from 'react';
   import ReactDOM from 'react-dom';
   import App from './App';

   ReactDOM.render(
     <React.StrictMode>
       <App />
     </React.StrictMode>,
     document.getElementById('root')
   );
   

Step 5: Run Your App

1. Run your application using the following command:

bash
   npm start
   

Conclusion

Unstated Next is a lightweight state management library that integrates seamlessly with React. By following these steps, you can easily manage state across multiple components in your React application using Unstated Next.

Example Code

Here is the complete code example:

javascript
// counter.js
import { createContainer } from 'unstated-next';

function useCounter() {
  const [count, setCount] = useState(0);

  const increment = () => setCount(count + 1);
  const decrement = () => setCount(count - 1);

  return { count, increment, decrement };
}

const CounterContainer = createContainer(useCounter);

export { CounterContainer };

// App.js
import React from 'react';
import { useContainer } from 'unstated-next';
import { CounterContainer } from './counter';

function CounterDisplay() {
  const { count } = useContainer(CounterContainer);
  return <p>Count: {count}</p>;
}

function CounterControls() {
  const { increment, decrement } = useContainer(CounterContainer);
  return (
    <div>
      <button onClick={decrement}>-</button>
      <button onClick={increment}>+</button>
    </div>
  );
}

function App() {
  return (
    <CounterContainer.Provider>
      <CounterDisplay />
      <CounterControls />
    </CounterContainer.Provider>
  );
}

export default App;

// index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

This example demonstrates how to use Unstated Next to manage state in a React application. It provides a reusable state container and allows components to access and update the state using React Hooks.