FrontendHaltJavaScript·Intermediate·Conceptual·1 min read
What is the observer pattern actually decoupling?
Short interview answer
It decouples the code that produces an event or change from the code that reacts to it — publishers don't need to know who's listening, and subscribers don't need to know who's publishing, only the shared event contract between them.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.