Why does NaN equal NaN false?

Yeah, a Not-A-Number is Not equal to itself. But unlike the case with undefined and null where comparing an undefined value to null is true but a hard check(===) of the same will give you a false value, NaN’s behavior is because of IEEE spec that all systems need to adhere to.

Is NaN false in JavaScript?

A falsy value is something which evaluates to FALSE, for instance when checking a variable. There are only six falsey values in JavaScript: undefined , null , NaN , 0 , “” (empty string), and false of course.

Why does JavaScript say NaN?

JavaScript Number NaN The NaN property represents “Not-a-Number” value. This property indicates that a value is not a legal number. The NaN property is the same as the Number. Tip: Use the isNaN() global function to check if a value is a NaN value.

How do I fix NaN error in JavaScript?

How to convert NaN to 0 using JavaScript?

1. Using isNaN() method: The isNan() method is used to check the given number is NaN or not.
2. Using || Operator: If “number” is any falsey value, it will be assigned to 0.
3. Using ternary operator: Here number is checked via ternary operator, similar to 1, if NaN it converts to 0.

What is NaN what is its type How can you reliably test if a value is equal to NaN?

A semi-reliable way to test whether a number is equal to NaN is with the built-in function isNaN(), but even using isNaN() is an imperfect solution. A better solution would either be to use value !== value, which would only produce true if the value is equal to NaN.

Is NaN a data type in JavaScript?

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 .

Is NaN a false value?

NaN is special in that it doesn’t have a real value, so comparing it to itself doesn’t return true. Essentially, NaN is equal to nothing, not even NaN . The only way to reliably compare something to NaN is using isNaN( value ) .

Why is false in JavaScript?

A falsy (sometimes written falsey) value is a value that is considered false when encountered in a Boolean context. JavaScript uses type conversion to coerce any value to a Boolean in contexts that require it, such as conditionals and loops. The keyword false . The Number zero (so, also 0.0 , etc., and 0x0 ).

Is NaN false?

NaN as you are using, is a global property initialized with value of Not-A-Number . It’s not boolean. It’s NaN data type as defined by IEEE 754. It’s the “same thing” you compare null === false (or even null == false ).