FrontendHaltJavaScript·Intermediate·Conceptual·1 min read
What is an execution context?
Short interview answer
It is the runtime environment used to evaluate code, including lexical and variable environment records, the current this binding, and other execution state. Global code, function calls, and eval create contexts with different rules.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.