EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Aug 27·5 min read
Understanding useMemo and useCallback
TL;DR
useMemo and useCallback are React hooks that help optimize performance by memoizing values and functions between renders. Understanding their proper use can significantly enhance application efficiency.
✦ Why It Matters
Start using useMemo and useCallback today to optimize your React application's performance.
Key Takeaways
- Use useMemo to cache expensive computations and avoid unnecessary recalculations.
- Implement useCallback to prevent function re-creation on every render.
- Consider restructuring components to minimize re-renders instead of relying solely on hooks.
- Utilize React.memo for pure components to optimize rendering based on prop changes.
How It Works
useMemo caches the result of a computation and only recalculates it when specified dependencies change, effectively acting as a cache. This reduces the workload during re-renders, especially for expensive calculations. useCallback serves a similar purpose for functions, ensuring that a function reference remains stable unless its dependencies change, which helps prevent unnecessary re-renders of child components.