Web Reference: Jun 6, 2020 · This tutorial covers NaN parameter and isNaN method functionality. Also, some edge case examples have been provided in this tutorial. Description In JavaScript, NaN is short for "Not-a-Number". In JavaScript, NaN is a number that is not a legal number. The Global NaN property is the same as the Number.NaN property. 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.
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