Question 7Imagine the below component structure, where all components ComponentA, ComponentB and ComponentC are simple presentational components that hold no props or state:2345678910111 return( <AppContext.Provider> <ComponentA /> </AppContext.Provider> );}; const ComponentA = React.memo(() => <ComponentB />);const ComponentB = () => <ComponentC />;const ComponentC = () => null;const App = () => {If the App component re-rendered for whatever reason, what would be the sequence of component re-renders that would take place?1 pointApp -> ComponentA -> ComponentB -> ComponentC. App -> ComponentB -> ComponentC App
Question
Question 7Imagine the below component structure, where all components ComponentA, ComponentB and ComponentC are simple presentational components that hold no props or state:2345678910111 return( <AppContext.Provider> <ComponentA /> </AppContext.Provider> );}; const ComponentA = React.memo(() => <ComponentB />);const ComponentB = () => <ComponentC />;const ComponentC = () => null;const App = () => {If the App component re-rendered for whatever reason, what would be the sequence of component re-renders that would take place?1 pointApp -> ComponentA -> ComponentB -> ComponentC. App -> ComponentB -> ComponentC App
Solution
The sequence of component re-renders that would take place if the App component re-rendered for whatever reason would be: App -> ComponentA -> ComponentB -> ComponentC.
This is because in React, when a parent component re-renders, all child components also re-render by default. However, ComponentA is wrapped in React.memo(), which means it will only re-render if its props change. Since ComponentA has no props, it will not re-render when App does, but it will still cause ComponentB and ComponentC to re-render because they are its child components.
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