Q47: Why are memoized selectors (like Reselect) used with Redux or global state?
Memoized selectors prevent unnecessary recalculations of derived state data and return stable reference outputs, preventing downstream child components from re-rendering when unrelated global state changes.
Key Takeaways
- Calculates derived state only when input state arguments change.
- Preserves reference stability to prevent unnecessary child component re-renders.
Knowledge Check
What happens when a memoized selector is called with unchanged input state arguments?