## What is the difference between isNaN () and isFinite () method?

isFinite function determines if the passed argument is finite value. It checks if its argument is not NaN , or negative infinity or positive positive infinity. isNaN on the other hand determines whether the argument passed is a NaN or not. This function is necessary because of the nature of NaN .

## What is isFinite JavaScript?

isFinite is a function property of the global object. You can use this function to determine whether a number is a finite number. The isFinite function examines the number in its argument. If the argument is NaN , positive infinity, or negative infinity, this method returns false ; otherwise, it returns true .

Can I use number isNaN?

Number. isNaN() returns true if a number is Not-a-Number. In other words: isNaN() converts the value to a number before testing it.

### What is the difference between isNaN and number isNaN?

Global isNaN() function first converts the argument to a number, and then returns true if the resulting value is NaN ; Number. isNaN() returns true if and only if the argument is of type Number and the value equals to NaN .

### What is the use of isNaN () function in JavaScript?

The isNaN() function determines whether a value is NaN or not. Because coercion inside the isNaN function can be surprising, you may alternatively want to use Number. isNaN() .

Is Numpy NaN?

In Python, NumPy with the latest version where nan is a value only for floating arrays only which stands for not a number and is a numeric data type which is used to represent an undefined value. In Python, NumPy defines NaN as a constant value.

## How is isNaN implemented?

C++ isnan() function It accepts a value (float, double or long double) and returns 1 if the given value is NaN; 0, otherwise. In C++11, it has been implemented as a function, bool isnan (float x); bool isnan (double x); bool isnan (long double x); Parameter(s):