FrontendHaltJavaScript·Intermediate·Conceptual·1 min read
What is shadowing?
Short interview answer
An inner declaration can use the same name as an outer binding, causing resolution inside the inner scope to select the nearer binding. It is legal in many cases but can reduce clarity; some var/lexical combinations are early syntax errors.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.