Javascript Number isNaN() Function Example

Javascript Number isNaN() Function Example

Javascript Number isNaN() is an inbuilt function that returns true if the value is of the type Number, and equates to NaN.

Javascript Number isNaN() is an inbuilt function that returns true if the value is of the type Number, and equates to NaN. Otherwise, it returns false. The Number.NaN() method determines whether the passed value is  NaN and its type is  Number. The Number.isNaN() method decides whether the value is NaN (Not-A-Number).

Javascript Number isNaN()

The isNaN() method returns true if the value is of the type Number, and equates to NaN. Otherwise, it returns false. Number.isNaN() is different from the global isNaN() function. The global isNaN() function converts the tested value to a  Number, then tests it.

Number.isNaN() does not convert the values to a Number, and will not return true for any value that is not of the type Number.

See the following syntax.

Number.isNaN(value)

The *value *parameter is required, and it is the value that needs to be tested.

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