FrontendHaltJavaScript·Beginner·Coding·1 min read
What is the core difference between == and ===?
Short interview answer
=== compares value and type with no conversion, so operands of different types are simply unequal. == first coerces both operands to a common type using the abstract equality algorithm's defined rules, then compares them.
Example
1 === '1'; // false — different types, no conversion1 == '1'; // true — '1' coerced to number 10 == false; // true — both coerce to 0null == undefined; // true (special-cased)Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.