Updated state value is not reflected inside setInterval() in React

The myTimer.current never changed which means isPaused is always false inside the function.

You need to make use of useEffect to update myTimer.current every time isPaused is updated.

useEffect(() => {
  function startTimer() {
    myTimer.current = setInterval(() => {
    }, 1000);
  return () => clearInterval(myTimer.current); // cleanup
}, [isPaused]);

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