Lodash _.complement() Method

0 0 1 minute read

The Lodash _.complement() method returns a function that reverses the sense of a given predicate-function.

Syntax:

_.complement( function );

Parameters: This method accepts a single parameter as listed above and discussed below.

function: This parameter predicate function defined containing the returning logic.

Return Value: This method returns a function.

Note: To execute the below examples, you have to install the lodash-contrib library by using this command prompt and execute the following command.

npm install lodash-contrib

Below examples illustrate the Lodash _.complement() method in JavaScript:

Example 1:

Javascript

// Defining lodash contrib variable 
var _ = require('lodash-contrib');  
  
function gfgFun (x) { 
    return x>=2 ; 
} 
  
var comp = _.complement(gfgFun); 
  
var x=1000; 
  
console.log("Without Complement Function:",gfgFun(x)) 
  
console.log("With Complement Function:",comp(x));

Output:

Without Complement Function: true
With Complement Function: false

Example 2:

Javascript

// Defining lodash contrib variable 
var _ = require('lodash-contrib');  
  
function gfgFun (x) { 
    return x=="Geeks" ; 
} 
  
var comp = _.complement(gfgFun); 
  
var x="zambiatek"; 
console.log("Without Complement Function:",gfgFun(x)) 
  
console.log("With Complement Function:",comp(x));

Output:

Without Complement Function: false
With Complement Function: true

Whether you’re preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, zambiatek Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we’ve already empowered, and we’re here to do the same for you. Don’t miss out – check it out now!