React Essentials · Components & JSX · Lesson 3 of 26

Composing Components

Concept

Composing Components

Components can render other components, letting you build complex UIs from small, reusable pieces.

By the end of this lesson

Explain the core idea behind Composing Components.
Predict output before running a change.
Test one realistic and one unusual input.
Use the result to make the next decision.

How to study this page

1. Read one concept.
2. Change the example.
3. Run, compare, and explain.
4. Complete the challenge below.

ExampleRunnable

function App() {
  return (
    <div>
      <Welcome />
      <Profile />
    </div>
  );
}

Try it Yourself »

Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Composing Components. Then reopen the editor and prove your explanation with a small test.

You are ready to continue when you can predict, test, and explain the result.

Your turn

Compose two of your own components inside a parent App component.

Loading editor…

Console

Output will appear here...