Underscore.js _.isNegative() Method

The _.isNegative() method checks whether the given value is a Negative value or not, correspondingly returning a boolean value.

Syntax:

_.isNegative( value );

Parameters:

• value: Given value to be checked for Negative value.

Return Value: This method returns a Boolean value(Returns true if the given value is Negative, else false).

Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed. Underscore.js contrib library can be installed using npm install underscore-contrib .

Example 1:

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Negative : "
    + _.isNegative(-200020));

Output:

The Value is Negative : true

Example 2:

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Negative : "
    + _.isNegative(1000000));

Output:

The Value is Negative : false

Example 3: For string containing negative values, this method returns true.

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Negative : "
    + _.isNegative("-1"));

Output:

The Value is Negative : true