React Essentials · Final Project · Lesson 26 of 26
Polishing and Testing
Concept
Polishing and Testing
Once the core works, test edge cases such as empty inputs, long lists, and fast clicking, then clean up the UI.
By the end of this lesson
- Explain the core idea behind Polishing and Testing.
- 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 Polishing and Testing. 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
Add a guard clause so your app ignores empty input submissions.
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Console