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. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
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.
Need a nudge?
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
Loading editor…
Console