Search⌘ K
Home
Courses
Learn React 19: The Complete Guide to Modern Web Apps

Introduction to React Components

Explore how React components form the foundation of dynamic user interfaces. This lesson helps you understand component creation, rendering, and hierarchy to structure maintainable, reusable UI elements, preparing you to build more complex React applications.

We'll cover the following...

Building complex user interfaces can be challenging, but React simplifies this process by breaking the UI into manageable, reusable pieces called components. Understanding and being able to apply components well is essential for any React developer.

Components are the fundamental units of a React application. Think of them as JavaScript functions or classes that accept inputs and return React elements describing what should appear on the screen.

Why components matter

  • Reusability: Components allow us to reuse code, making our application more maintainable.

  • Modularity: Breaking the UI into components makes it easier to manage and debug.

  • Readability: A well-structured components hierarchy improves the readability of our code.

Creating our first component

Let’s create a simple functional component that displays a greeting message.

Javascript (babel-node)
function Greeting() {
  return <h1>Hello, World!</h1>;
}
export default Greeting;

  • Lines 1–3: We define a ...