FrontendHaltReact·Intermediate·Output based·1 min read
How do you decide whether logic belongs in an event handler or an effect?
Short interview answer
If work happens because the user performed a specific action, keep it in that event flow. If it is required because the component is currently rendered with particular data and must synchronize an external system, use an effect.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.