chapter.checkpoint
Conditional UI and Lists
Pause here and make sure the main ideas feel clear before moving to the next chapter.
Review recommended
What you should understand now
Show different UI based on data and render collections safely.
Conditional rendering
Show one thing or another.
Empty and loading states
Handle moments when data is not ready.
Updating arrays in state
Add, remove, and change list items safely.
progress.review
Chapter progress
Lessons completed
0/3
0% complete
Exercises attempted
0/3
0% complete
Quizzes passed
0/1
0% complete
Before you move on
Use this quick review if anything still feels unclear.
Review chapterRetake chapter quiz
Complete the lessons, pass the exercises, and pass the quiz to unlock the next chapter.