What is the typeof NaN?

By definition, NaN is the return value from operations which have an undefined numerical result. Hence why, in JavaScript, aside from being part of the global object, it is also part of the Number object: Number. NaN. It is still a numeric data type, but it is undefined as a real number.

Why NaN !== NaN?

Why is NaN a Number type? You might expect something called Not-a-Number to not be a number, but typeof NaN === “number'' . This is needed in order for NaN to work the way it does. It has to inherit from the Number prototype so that any mathematical operations performed with it do not throw errors.

What is the data type of NaN?

NaN (Not a Number) is a numeric data type that means an undefined value or value that cannot be represented, especially results of floating-point calculations.

What is the NaN object type?

NaN (Not a Number): NaN represents missing or undefined data in Python. It is typically encountered while performing mathematical operations that result in an undefined or nonsensical value. NaN is a floating-point value represented by the float('nan') object in Python.

A comparison with a NaN always returns an unordered result even when comparing with itself. Basically, a NaN is not equal to any other number, including …
Even though the name “NaN” stands for “Not-a-Number,” JavaScript still categorizes it as a number because it came from a mathematical operation.
NaN is the only value not strictly equal to itself. v !== v. will be true if v is NaN. Both node and browser environment also have a isNaN …