Issues with Debouncing Input in React Using useEffect and useState with TypeScript
I keep running into I'm maintaining legacy code that I'm trying to implement a debounced input field in my React application using TypeScript, but I'm encountering an issue where the debounced value does not update correctly when the input is rapidly changed... I have the following code: ```typescript import React, { useState, useEffect } from 'react'; const DebouncedInput: React.FC = () => { const [inputValue, setInputValue] = useState<string>(''); const [debouncedValue, setDebouncedValue] = useState<string>(''); useEffect(() => { const handler = setTimeout(() => { setDebouncedValue(inputValue); }, 300); return () => { clearTimeout(handler); }; }, [inputValue]); return ( <div> <input type="text" value={inputValue} onChange={(e) => setInputValue(e.target.value)} /> <p>Debounced Value: {debouncedValue}</p> </div> ); }; export default DebouncedInput; ``` While this seems straightforward, I've noticed that if I type quickly, sometimes the `debouncedValue` lags behind or even shows outdated values. When I check the React DevTools, it seems like multiple `setTimeout` calls are piling up, and sometimes they even update the state incorrectly after I stop typing. I initially thought this was due to stale closures, but I ensured that I'm only using `inputValue` from the state in the effect hook. I tried logging `inputValue` before setting the `debouncedValue`, and the logs show the correct current value. Could this be related to how React batches state updates? How can I ensure that `debouncedValue` always shows the latest input after the debounce interval, even when typing rapidly? Any insights or adjustments I could make to fix this would be greatly appreciated! I'd really appreciate any guidance on this.