React Essentials · Hooks · Lesson 8 of 26
useState Recap
Concept
useState Recap
useState is the most common hook. It stores a value and a function used to update it.
By the end of this lesson
- Explain the core idea behind useState Recap.
- 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 useState Recap. 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
Use useState to track whether a sidebar is open or closed.
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.
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