In the past, I did not care how ReactJS creates functions and variables while re-rendering components.
But I had a few chance to look at about this.
Now ReactJS creates all functions and variables newly whenever they re-render their component.
To optimize performance with memory, useCallback was very effective for this, and decreased re-creation times a lot more.
Please check my repository, and github pages to test.
https://github.com/yeahCH/react-performance-inspector
https://yeahch.github.io/react-performance-inspector/
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