Quiz: React 19 Performance Architecture
Test your understanding of React 19 performance architecture.
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Technical Quiz
1
A component wrapped in React.memo receives the following props across two renders:
prevProps: { value: { count: 1 }, label: "A" }
nextProps: { value: { count: 1 }, label: "A" }
What does React.memo do?
A)
Skips the re-render because the deep values match.
B)
Re-renders because value fails referential equality.
C)
Skips the re-render because Object.is compares fields individually.
D)
Throws a warning because objects cannot be compared in memoized components.
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