Answer
== compares with coercion; === compares type + value strictly.
Quick Answer
== coerces types before comparing — false == 0 is true, "" == 0 is true, null == undefined is true. === compares type AND value with no coercion — false === 0 is false. Always use === to avoid unexpected coercion. The only common use of == is null == undefined when you want to check for both in one expression.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ