Web Reference: Apr 16, 2010 · The NaN (Not-a-Number) is a weirdo Global Object in javascript frequently returned when some mathematical operation failed. You wanted to check if NaN == null which results false. 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.
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