I already answered this in a reply to another comment.
"I follow a general rule of using refs if I don't want to re-render, and using state if I want to re-render. I use local variables only for the derived state(incoming props). Also it was giving me a linting error as local variables value is lost on every re-render(which is fine in this case)."
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what is the advantage of using "useRef.current" instead of just creating a variable "var isMounted = false(or true)"
I already answered this in a reply to another comment.
"I follow a general rule of using refs if I don't want to re-render, and using state if I want to re-render. I use local variables only for the derived state(incoming props). Also it was giving me a linting error as local variables value is lost on every re-render(which is fine in this case)."