useCallback vs useMemo — Most developers confuse these two 👇 Both memoize. But what exactly? 🔴 Common mistake: Using useMemo for functions and useCallback for values. ✅ Simple rule: useCallback → memoizes a FUNCTION const fn = useCallback(() => { doSomething() }, [dependency]) useMemo → memoizes a VALUE const value = useMemo(() => { return expensiveCalculation() }, [dependency]) 🤔 When to use which? useCallback → when passing functions as props to child components useMemo → when computing expensive values on every render ⚠️ Don't overuse either! Memoization has its own cost. Profile first, optimize later. Took me way too long to understand this. Hope this saves you time! 🚀 Found this helpful? Save it for later! 🔖 #ReactJS #JavaScript #Frontend #WebDevelopment #ReactHooks #Programming
Good explanation. The “don’t overuse memoization” point is important — many apps get more complexity than performance from it.
Well explained 👌 From my experience, overusing these hooks often creates more complexity than performance gains. Most of the time, unnecessary memoization just adds mental overhead. Profiling really is the key.
Took me weeks to truly understand the difference! 😅 Which one do you use more often?