Skip to content
Related Articles

Related Articles

Underscore.js _.falsey() Method
  • Last Updated : 13 Aug, 2020

The _.falsey() method checks whether the given value is falsey or not, correspondingly returning a boolean value. A falsey value is one that coerces to false in a boolean context.

Syntax:

_.falsey( value );

Parameters: 

  • value: Given value is to be checked for falsey value.

Return Value: This method returns a Boolean value (Returns true if the given value is falsey, 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 –save.

Example 1: False boolean always returns true.

Javascript




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
var bool = _.falsey(false);;
  
console.log("Given Value is Falsey : ",bool);

Output:

Given Value is Falsey : true

Example 2: Existing values return a true boolean, hence this method returns false.

Javascript




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
var bool = _.falsey(10);;
  
console.log("Given Value is Falsey : ",bool);

Output:

Given Value is Falsey : false    

Example 3: 

Javascript




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
var bool = _.falsey([ 1, 2, 3 ]);;
  
console.log("Given Value is Falsey : ",bool);

Output:

Given Value is Falsey : false

Example 4: 

Javascript




// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
var bool = _.falsey(true);;
  
console.log("Given Value is Falsey : ",bool);

Output:

Given Value is Falsey : false    

full-stack-img

My Personal Notes arrow_drop_up
Recommended Articles
Page :