Optimizing React applications is all about knowing the right tools—and two of the most powerful ones in your toolkit are useMemo
and useCallback
. These hooks can help you avoid unnecessary re-renders and recalculations, making your app faster and smoother.
What You’ll Learn:
- When and why to use useMemo
- How useCallback can save you from performance pitfalls
- Code examples to get you started
Here’s a sneak peek 👇:
useMemo
: Simplify Complex Calculations
useMemo
lets you memoize the result of a function. It recalculates only when dependencies change, saving computation time.
const squaredValue = useMemo(() => {
return count * count;
}, [count]);
useCallback
: Memoize Functions Like a Pro
useCallback
ensures your callback functions are not recreated on every render, preventing unnecessary re-renders in child components.
const handleChange = useCallback((e) => {
setText(e.target.value);
}, []);
Want the Full Breakdown with Examples?
I’ve shared a detailed guide with more examples and explanations on my personal blog.
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