Web Reference: Oct 28, 2025 · The null keyword refers to the null primitive value, which represents the intentional absence of any object value. As many know, (0 == "") is true in JavaScript, but since 0 is a value and not empty or null, you may want to test for it. The following two functions return true only for undefined, null, empty/whitespace values and false for everything else, such as numbers, Boolean, objects, expressions, etc. Jan 16, 2026 · null and undefined are both primitive values in JavaScript, but they serve distinct purposes: null is intentional: Use it to explicitly signal that a variable/property should hold an object but currently does not.
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