Web Reference: Feb 22, 2011 · With null you use it generally to erase the contents of a variable, with undefined it generally comes with input when there hasn't been set a value yet. Jul 23, 2025 · undefined indicates a variable hasn’t been initialized, while null is intentionally assigned to indicate no value. Understanding the distinction helps write cleaner, more predictable code in JavaScript, especially when handling default values or checking for missing data. The null value represents the intentional absence of any object value. It is one of JavaScript's primitive values and is treated as falsy for boolean operations.
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