Selectors & Preventing Unnecessary Re-renders
Extract specific state slices via selectors so components only re-render when needed.
Welcome
In this lesson you will use Zustand selectors to subscribe components to only the state slices they need, preventing unnecessary re-renders when other parts of the store change.
The Default Selector Problem
Calling the store hook without a selector returns the entire store object. The component re-renders on EVERY store change, even changes to unrelated state.
// Bad: re-renders on every store change
const store = useAppStore();
return <p>{store.user.name}</p>;All lessons in this course
- Creating Your First Zustand Store
- Selectors & Preventing Unnecessary Re-renders
- Persisting State with the Persist Middleware
- Zustand DevTools & Testing Stores