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AI solution for React Quiz on BFE.dev
18. useRef 2
When the button is focused, the console will output true
. The useLayoutEffect
hook inside the App
component logs 1
and sets the ref.current
value to true
. When the button is focused, it checks the value of !!ref.current
, which will be true
since the useLayoutEffect
hook is called before the component renders and updates the ref.current
value.