FrontendHaltReact·Intermediate·Conceptual·1 min read
When is an external store with selectors more suitable?
Short interview answer
For large or high-frequency shared state, selectors allow consumers to subscribe to small slices rather than invalidating every consumer. External stores also offer lifecycles and tooling beyond context propagation.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.