FrontendHaltJavaScript·Intermediate·Conceptual·1 min read
Why do == and === both return false when comparing two different arrays with identical contents?
Short interview answer
Neither operator performs structural comparison for objects or arrays — both compare object references, so two distinct array instances are never equal to each other regardless of operator, even with identical contents.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.