🚨 React developers, are you STILL making this mistake? Most bugs in toggles and boolean states come from one simple issue: ✅ React batches state updates. ❌ So calling setState(!state) twice won’t toggle twice — it uses the same stale value. The fix? Always use the functional state updater: setState(prev => !prev) It guarantees you’re working with the most up-to-date value, even during batched renders. Small change, HUGE improvement in reliability and UI behavior. ⚡ #ReactJS #JavaScript #Frontend #WebDevelopment #CleanCode #ReactDeveloper #TypeScript #CodingTips #Performance #SoftwareEngineering #TechTips
spot on, functional updates save so many headaches, especially when multiple state changes fire in quick succession, a must know for every React dev.
even better stop using booleans to manage state like this. Model as an enum: idle, editing, dirty, valid. Booleans don't allow you to scale. Its a binary thing. Ask yourself what are the various 'state's this component or element can be in. maybe it's untouched, editing, valid, error ?
Would be better if you explain the principe Behind this ("The closure"), One of the most common React pitfall XD "The closure" captures the value at render time, not the "live" value.
100% true. React’s batching behavior can be tricky when updating boolean states in quick succession. Using the functional form setState(prev => !prev) ensures consistency, especially when multiple updates happen in one render cycle.