Lodash _.isNaN() Method

Lodash _.isNaN() Method checks the given value is NaN or not. This method is not the same as the JavaScript isNaN() method which returns true for undefined and other non-number values.

Syntax:

_.isNaN( value )

Parameters:

This method accepts a single parameter as mentioned above and described below:

• value: This parameter holds the value that needs to be checked for NaN.

Return Value:

This method returns a Boolean value (Returns true if the value is NaN, else false).

Example 1: This code uses the Lodash library to check if a value is NaN (Not a Number).

Javascript

// Defining Lodash variable
const _ = require('lodash');

// Checking
console.log(_.isNaN(NaN));

Output:

true

Example 2: For checking with an empty source this method returns true.

Javascript

// Defining Lodash variable
const _ = require('lodash');

// Checking
console.log(_.isNaN(new Number(NaN)));

Output:

true

Example 3: This code uses the Lodash library to check if values are NaN (Not a Number).This method also works for arrays.

Javascript

// Defining Lodash variable
const _ = require('lodash');

// Checking
console.log(_.isNaN(undefined));

// Checking
console.log(_.isNaN(10));

Output:

false
false