12. Advanced Concepts

Introduction In this chapter, we’ll dive into some advanced concepts in React. Geek and Gal will help you understand these topics with their humorous and engaging interactions, making it accessible for beginners and advanced users alike!

Are you ready to level up your React skills?

Absolutely! What are the advanced concepts we'll be learning?

We'll cover Higher-Order Components (HOCs) , Render Props , and Context API ! Let's start with HOCs!

Higher-Order Components (HOCs)

Higher-Order Components, or HOCs, are functions that take a component and return a new component with additional props or behavior. It's like giving your component superpowers! 💪

Oh, that sounds cool! How do we create an HOC?

It's simple! Just define a function that takes a component as an argument, and then returns a new component that wraps the original one. Here's an example:

function withSuperpowers(WrappedComponent) {
  return function EnhancedComponent(props) {
    const extraProp = 'I have superpowers!';
    return <WrappedComponent {...props} extraProp={extraProp} />;
  };
}

Got it! So an HOC is a function that takes a component and returns a new, enhanced component!

Exactly! Now let's move on to Render Props !

Render Props

Render Props is a technique where you pass a function as a prop to a component, and that function returns some JSX. It's a way to share code between components without using HOCs!

Interesting! Can you show me an example?

Sure thing! Here's a simple example of a component that uses render props:

function MouseTracker(props) {
  const [position, setPosition] = useState({ x: 0, y: 0 });

  const handleMouseMove = (event) => {
    setPosition({ x: event.clientX, y: event.clientY });
  };

  return (
    <div style={{ height: '100%' }} onMouseMove={handleMouseMove}>
      {props.render(position)}
    </div>
  );
}

Ah, I see! So we pass a function as a prop, and that function is responsible for rendering the JSX!

You got it! Finally, let's learn about the Context API !

Context API

The Context API is a way to share data between components without passing props down through multiple layers. It's like a global store for your app!

That sounds useful! How do we use the Context API?

First, you create a context using React.createContext() . Then, you use a Provider to make the data available to all components in the tree. Finally, you use a Consumer or useContext hook to access the data!

// Create a context
const ThemeContext = React.createContext('light');

// Use a Provider
function App() {
  return (
    <ThemeContext.Provider value="dark">
      {/* ... other components ... */}
    </ThemeContext.Provider>
  );
}

// Use a