Undefined Vs Not Defined Javascript - Latest Information & Updates 2026

Web Reference: May 7, 2009 · An undeclared variable does not exist in Javascript memory whereas a declared one does and can be set to undefined. The difference is caused by Javascript design confusion. Jul 23, 2025 · If the variable name which is being accessed doesn't exist in memory space then it would be not defined, and if exists in memory space but hasn't been assigned any value till now, then it would be undefined. Mar 28, 2025 · What is “Not Defined”? “Not defined” refers to a variable that hasn’t been allocated memory. On the other hand, undefined does not mean empty; it is a special keyword in JavaScript.

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