Javascript Tutorial Nan And Isnan - Latest Information & Updates 2026

Web Reference: Description In JavaScript NaN is short for "Not-a-Number". The isNaN() method returns true if a value is NaN. The isNaN() method converts the value to a number before testing it. The isNaN() function determines whether a value is NaN, first converting the value to a number if necessary. Because coercion inside the isNaN() function can be surprising, you may prefer to use Number.isNaN(). Apr 16, 2010 · Since NaN is the only JavaScript value that is treated as unequal to itself, you can always test if a value is NaN by checking it for equality to itself: Didn't realize this until @allsyed commented, but this is in the ECMA spec: https://tc39.es/ecma262/multipage/global-object.html#sec-isnan-number. Effective but counterintuitive.

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