**Contents**show

## How does JavaScript handle NaN value?

**var nanValue = NaN**; if(nanValue !== nanValue) // Returns true! alert(‘nanValue is NaN’); This returns true only for NaN values and Is a safe way of testing.

## Why does JavaScript show NaN?

The special value NaN shows up in JavaScript **when Math functions fail** ( Math. sqrt(-37) ) or when a function trying to parse a number fails ( parseInt(“No integers here”) ). NaN then poisons all other math functions, leading to all other math operations resulting in NaN .

## How do I fix NaN error in JavaScript?

**How to convert NaN to 0 using JavaScript ?**

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

## How do you prevent NaN?

**Here are 4 methods to avoid NaN values.**

- Avoid #1: Mathematical operations with non-numeric string values. …
- Avoid #2: Mathematical operations with functions. …
- Avoid #3: Mathematical operations with objects. …
- Avoid #4: Mathematical operations with falsy values. …
- Conclusion.

## What causes NaN?

“NaN” stands for “not a number”. “Nan” is **produced if a floating point operation has some input parameters that cause the operation to produce some undefined result**. For example, 0.0 divided by 0.0 is arithmetically undefined. Finding out the square root of a negative number too is undefined.

## Is NaN equal to NaN?

**NaN is not equal to NaN**! Short Story: According to IEEE 754 specifications any operation performed on NaN values should yield a false value or should raise an error. Thanks CJ J for sharing this.

## Is NaN function JavaScript?

JavaScript isNaN() Function

The isNaN() function **determines whether a value is an illegal number** (Not-a-Number). This function returns true if the value equates to NaN. Otherwise it returns false. This function is different from the Number specific Number.

## Is NaN false in JavaScript?

This means that in JavaScript, isNaN(x) == true is equivalent to x – 0 returning NaN (though in JavaScript **x – 0 == NaN always returns false**, so you can’t test for it). … isNaN(Number(x)) always return the same and in JavaScript isNaN(x) is just the shortest possible form to express each of these terms.

## Why is Typeof NaN a Number?

The type of NaN , which stands for Not a Number is, surprisingly, a number. The reason for this is, in computing, NaN is actually technically a numeric data type. However, it is a numeric data type whose value cannot be represented using actual numbers. … It instead means **that the value cannot be expressed with numbers**.

## What is the use of NaN?

Unquoted literal constant NaN is a special value representing Not-a-Number. Since NaN always compares unequal to any number, including NaN, it is usually used to **indicate an error condition for a function that should return a valid number**. Note − Use the isNaN() global function to see if a value is an NaN value.

## What is a NaN value?

NaN stands **for Not A Number** and is one of the common ways to represent the missing value in the data. It is a special floating-point value and cannot be converted to any other type than float. NaN value is one of the major problems in Data Analysis.