Performance & Accessibility

What this module covers

5 steps · React

1. Step 1. Lesson: Performance & Accessibility

   Measure before optimizing, reduce avoidable renders, lazy-load heavy work, and build keyboard- and screen-reader-friendly components. Learning objectives - Recognize when performance & accessibility is the right tool. - Explain the role of memo, lazy, aria. - Build a small working example before combining it with a larger interface. - Identify one accessibility, maintainability, or error-handling improvement. Read the example, predict what it will do, then complete the small change described in the check question.

   Measure before optimizing, reduce avoidable renders, lazy-load heavy work, and build keyboard- and screen-reader-friendly components. In React, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [React] Use the example to demonstrate performance & accessibility.

2. Step 2. Quiz: Performance & Accessibility

   Check your understanding of Performance & Accessibility.

   Profiling identifies whether memoization solves a real bottleneck. In React, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [React] Complete the knowledge check.

3. Step 3. Exercise: Performance & Accessibility

   Profile a slow list, fix one measured bottleneck, then audit keyboard navigation and accessible names.

   This exercise turns the Performance & Accessibility lesson into a working code change. In React, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [React] Does the solution use memo and lazy and aria?

4. Step 4. Review lab: Explain & improve Performance & Accessibility

   Rebuild the exercise without copying the solution. Then improve it in two ways: make the code easier to understand and add one useful edge case, responsive behavior, accessibility improvement, or error state. Finally, write a short explanation of how memo, lazy, aria work together.

   Rebuilding from memory and improving an edge case turns recognition into durable skill. In React, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [React] Does the improved version still use memo, lazy, aria clearly?

5. Step 5. Mini project: Performance & Accessibility

   Optimize and accessibility-test a large interactive dashboard without premature memoization.

   The mini project combines the module lesson, quiz, and exercise into one portfolio-ready result. In React, make the state/interaction visible in the UI so completion is easy to verify.

   Check yourself: [React] Does the project apply the module's performance & accessibility skills?