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React Essentials · Data Fetching · Lesson 19 of 26

Displaying Fetched Lists

Concept

Displaying Fetched Lists

Use map() to turn an array of fetched data into a list of JSX elements, each with a unique key.

By the end of this lesson
  • Explain the core idea behind Displaying Fetched Lists.
  • 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
{courses.map((c) => <li key={c.id}>{c.title}</li>)}
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Displaying Fetched Lists. 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 fetched array of items as a list, using each item's id as the key.

Loading editor…

Console

Output will appear here...