Web Reference: Jul 10, 2025 · The Number.isNaN() static method determines whether the passed value is the number value NaN, and returns false if the input is not of the Number type. It is a more robust version of the original, global isNaN() function. 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 · Therefore, isNaN() answers neither the question "is the input the floating point NaN value" nor the question "is the input not a number". Number.isNaN() is a more reliable way to test whether a value is the number value NaN or not.
YouTube Excerpt: Occasionally you need to test for the NaN
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