React: Handling Conditional Rendering with useMemo but Encountering Stale Closure Issues
I'm relatively new to this, so bear with me. I'm trying to implement conditional rendering in a React component using `useMemo` to optimize performance, but I'm running into stale closure issues which seem to reflect outdated state in my rendered output. My component looks something like this: ```javascript import React, { useState, useMemo } from 'react'; const MyComponent = () => { const [count, setCount] = useState(0); const [isToggled, setToggle] = useState(false); const handleToggle = () => setToggle(prev => !prev); const renderedValue = useMemo(() => { console.log('Calculating rendered value...'); return isToggled ? count * 2 : count; }, [count, isToggled]); return ( <div> <h1>{renderedValue}</h1> <button onClick={() => setCount(count + 1)}>Increment Count</button> <button onClick={handleToggle}>Toggle</button> </div> ); }; export default MyComponent; ``` When I click the "Increment Count" button, the displayed value updates correctly. However, when I toggle the switch, the output seems to reflect the previous value of `count` instead of the current one. This is leading to confusion because I expected `useMemo` to always recalculate based on the latest state. I’ve confirmed that `count` and `isToggled` are updating correctly in the state, but the rendered value doesn’t seem to update as expected when toggling happens quickly after incrementing the count. I’ve tried using the `useEffect` hook to log the current values of `count` and `isToggled` and they appear correct, but the memoized value does not update accordingly. I've also looked into whether the dependencies array is set correctly but I'm not sure what else could be affecting this. Any insights on how I can resolve the stale closures or optimize this rendering pattern would be greatly appreciated. This is using React version 17.0.2. This is part of a larger service I'm building. Any ideas what could be causing this?