Javascript Tutorial Nan And Isnan Net Worth 2026: Salary, Income & Wealth

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. Jul 8, 2025 · To test if a value is a number, use typeof x === "number". The isNaN() function answers the question "is the input functionally equivalent to NaN when used in a number context". If isNaN(x) returns false, you can use x in an arithmetic expression as if it's a valid number that's not NaN. 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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Javascript Tutorial Nan And Isnan Net Worth 2026: Salary, Income & Wealth Net Worth & Biography

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Estimated Worth: $43M - $60M

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Last Updated: April 8, 2026

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