Hands-on practice for this lecture. Work through the exercises and quizzes to reinforce what you've learned.
Exercise 1 of 1
Pass expensive components as children to isolate them from state changes in the wrapper.
IntervalSection renders: 1
ExpensiveStats renders: 1
This component does not use interval — but it still re-renders.
Click an interval button. ExpensiveStats flashes every time even though it doesn't use interval — it re-renders because its parent re-renders.