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Discussion on: The React useMemo Hook Made Simple

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Alex Lohr •

Basically, what useMemo does is creates a state and updates it with an effect:

const result = useMemo(() => fibonacci(number), [number])
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almost equals

const [result, setResult] = useState()
useEffect(() => { setResult(fibonacci(number)) }, [number])
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except that the first setResult dispatcher call is handled synchonously.