Advanced React Patterns With Hooks/

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Keeping Value Constant

Keeping Value Constant

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Using useRef to Ensure Value Remains Constant

The solution to this problem is simple. We can use the useRef hook to ensure that a value stays the same throughout component’s entire lifetime.

Here’s how it works:

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//correct implementation
  const componentJustMounted = useRef(true)
  useEffect(
    () => {
      if (!componentJustMounted.current) {
        onExpand(expanded)
      }
     componentJustMounted.current = false
    },
    [expanded]
  )

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