isNaN()

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If you'd like to contribute to the data, please check out and send us a pull request. The value is the same as of the global object. A NaN also results from attempted coercion to numeric values of non-numeric values for which no primitive numeric value is available.

The largest positive representable number. Return value true if the given value is ; otherwise, false. A primitive type object number created using the Number function. Properties The smallest interval between two representable numbers.

Number.isInteger()

Syntax isNaN v alue Parameters value The value to be tested. Return value true if the given value is ; otherwise, false. Hence, the necessity of an isNaN function. Origin of NaN values NaN values are generated when arithmetic operations result in undefined or unrepresentable values. Such values do not necessarily represent overflow conditions. A NaN also results from attempted coercion to numeric values of non-numeric values for which no primitive numeric value is available. For example, dividing zero by zero results in a NaN — but dividing other numbers by zero does not. Confusing special-case behavior Since the very earliest versions of the isNaN function specification, its behavior for non-numeric arguments has been confusing. When the argument to the isNaN function is not of typethe value is first coerced to a Number. The resulting value is then tested to determine whether it is. Alternatively, in absense of Number. If it returns true, x will make every arithmetic expression return NaN. Actually, isNaN xisNaN x - 0isNaN Number xNumber. This way you can have a function that makes use of the full versatility JavaScript provides by implicitly converting values depending on context.

Not for use in new websites. The Number JavaScript object is a wrapper object allowing you to work with numerical values. Such values do not necessarily represent overflow conditions. Return value A indicating whether or not the given value is an integer. If you'd like to contribute to the data, please check out and send us a pull request. The source for this interactive example is stored in a GitHub repository.