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Lodash _.not() Method

  • Last Updated : 29 Sep, 2020

The Lodash _.not() method returns a boolean value which is the opposite of the truthiness boolean value of the given value.

Syntax:

_.not( value );

Parameters: This method takes one parameter as mentioned above and described below:

  • value: Given value for returning opposite boolean.

Return Value: This method returns a Boolean value.

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



Example 1:

Javascript




// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
var bool = _.not( true ); 
    
console.log("Opposite boolean value 'true' is : ", bool);
  
var bool = _.not( false ); 
    
console.log("Opposite boolean value 'false' is : ", bool);

Output:

Opposite boolean value 'true' is : false
Opposite boolean value 'false' is : true

Example 2:

Javascript




// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
var bool = _.not( 0 ); 
    
console.log("Opposite boolean value '0' is : ", bool);
  
var bool = _.not( 1 ); 
    
console.log("Opposite boolean value '1' is : ", bool);
  
var bool = _.not( 10 ); 
    
console.log("Opposite boolean value '10' is : ", bool);

Output:

Opposite boolean value '0' is : true
Opposite boolean value '1' is : false
Opposite boolean value '10' is : false

Example 3:

Javascript




// Defining lodash contrib variable 
var _ = require('lodash-contrib'); 
  
var bool = _.not( {} ); 
    
console.log("Opposite boolean value empty object is : ", bool);
  
var bool = _.not( {'G' : "GeeksforGeeks"} ); 
    
console.log("Opposite boolean value object is : ", bool);
  
var bool = _.not( null ); 
    
console.log("Opposite boolean value 'null' is : ", bool);

Output:

Opposite boolean value empty object is : false
Opposite boolean value object is : false
Opposite boolean value 'null' is : true



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