Answer
null: intentional empty value.
undefined: declared but not assigned.
Quick Answer
undefined: variable declared but no value assigned, or missing function return, or missing object property. null: explicitly assigned to mean "no value" — intentional emptiness. typeof undefined is "undefined"; typeof null is "object" (historical bug). null === undefined is false; null == undefined is true.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ