ObjectisNaNvalue

ObjectisNaNvalue is a static method in JavaScript that determines whether the passed value is NaN and is not an instance of the Number object. It is a more robust way to check for NaN compared to the global isNaN() function.

The global isNaN() function has a quirk: it attempts to coerce its argument to a number before checking if it's NaN. This means that values that are not strictly numbers, but can be converted into numbers that are NaN, will return true. For example, isNaN("hello") returns true because "hello" is coerced to NaN.

ObjectisNaNvalue, on the other hand, first checks if the value is of the number type. If it is not, it immediately returns false. If the value is a number, it then checks if that number is NaN. This behavior prevents unexpected results when non-numeric values are passed. For instance, ObjectisNaNvalue("hello") returns false, while ObjectisNaNvalue(NaN) returns true.

The syntax for ObjectisNaNvalue is ObjectisNaNvalue(value). The parameter 'value' is the value to be tested. The method returns a boolean value: true if the value is NaN and not an instance of Number, and false otherwise. This method is particularly useful in situations where precise NaN checking is required, especially when dealing with data that might originate from various sources and could include non-numeric types.