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React Essentials · Components & JSX · Lesson 2 of 26

JSX Syntax Basics

Concept

JSX Syntax Basics

JSX looks like HTML but is actually JavaScript. Curly braces let you embed any JavaScript expression inside it.

By the end of this lesson
  • Explain the core idea behind JSX Syntax Basics.
  • 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. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
function Profile() {
  const name = "Alex";
  return <p>Welcome, {name}!</p>;
}
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in JSX Syntax Basics. 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

Render a component that shows today's date using new Date().toDateString().

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Console

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