How to convert NaN to 0 using JavaScript ?

NaN (Not a Number) is usually used to indicate an error condition for a function that should return a valid number but it can be converted to 0 using JavaScript. In this article, we will convert the NaN to 0. 

Using isNaN() method: The isNan() method is used to check whether the given number is NaN or not. If isNaN() returns true for “number” then it assigns the value 0.

Example: In this example, we will check given number is NaN or not.

javascript

number = NaN;
if (isNaN(number)) number = 0;
console.log(number);

Output:

0

Using || Operator: If “number” is any falsy value, it will be assigned to 0.

Example: In this example, we will compare NaN with 0 using || operator

javascript

number = NaN;
number = number || 0;
console.log(number);

Output:

0

Using ternary operator: Here the number is checked via ternary operator, similar to 1, if NaN it converts to 0.

Example: In this example, we will use the ternary operator to convert NaN to 0.

javascript

number = NaN;
number = number ? number : 0;
console.log(number);

Output:

0

Note: While executing the code on our IDE or on your browser, check the console (F12) to see the result.

Using Strictly Equality(===) operator: JavaScript Strict Equality Operator is used to compare two operands and return true if both the value and type of operands are the same. to convert NaN into zero using the === operator first comparing NaN value with zero if the comparison is successful NaN is returned, otherwise, zero is returned.

Syntax:

(NaN === 0) ? NaN : 0

Example: In this example, we will convert NaN to 0 by using === operator, first we compare the NaN value with zero if it is true we return NaN in another case we return 0.

Javascript

let a = NaN;
a = (a === 0) ? a : 0;

console.log("Result: " + a);

Output:

Result: 0