Concept of Componentization

Hello, students! In the previous topic, we learned about the recommended practices when using JSX.

And in this class, we will learn about the concept of componentization.

Components are fundamental building blocks of React.

They allow us to divide our user interface into smaller and more manageable chunks.

Why Use Components?

There are several advantages to using components:

• Reusability: Components can be reused in different parts of the user interface.
• Organization: Components help organize the code and make the user interface more readable.
• Testability: Components can be tested individually, making debugging easier.

How to Create Components

To create a component, we need to define a class that inherits from React.Component.

The class should have a render() method that returns the JSX code to be rendered by the component.

For example, the following code creates a component that renders a header:

class Header extends React.Component {
  render() {
    return (
      <h1>My Header</h1>
    );
  }
}

Example of Componentization

Let’s see an example of how to use components to divide a user interface into smaller and more manageable pieces.

The following code renders a list of products:

class App extends React.Component {
  render() {
    return (
      <div>
        <ul>
          {this.state.products.map((product) => (
            <li key={product.id}>{product.name}</li>
          ))}
        </ul>
      </div>
    );
  }
}

This code is quite complex and hard to maintain.

We can divide this code into smaller and more manageable components, as follows:

class ProductList extends React.Component {
  render() {
    return (
      <ul>
        {this.props.products.map((product) => (
          <li key={product.id}>{product.name}</li>
        ))}
      </ul>
    );
  }
}

class App extends React.Component {
  render() {
    return (
      <div>
        <ProductList products={this.state.products} />
      </div>
    );
  }
}

This code is easier to understand and maintain.

Conclusion

In today’s topic, we learned about the concept of componentization.

Components are fundamental building blocks of React.

They allow us to divide our user interface into smaller and more manageable pieces, bringing various advantages such as reusability, organization, and testability.

If you have questions, leave them in the comments. So, let’s move on to the next class.