Collect.js unless() Method

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The unless() method is executes the callback provided when false is evaluated by the first argument given to the method.

Syntax:

collect.unless()

Parameters: The collect() method takes one argument that is converted into the collection and then unless() method is applied on it.

Return Value: This method returns the merged collection elements.

Below example illustrate the unless() method in collect.js:

Example 1:

Javascript

const collect = require('collect.js');  
    
let arr = ['C++', 'java', 'python'];  
    
const collection = collect(arr); 
  
collection.unless(false, items => items.push('c#')); 
    
let newObject =  collection.all();    
        
console.log(newObject);

Output:

["C++", "java", "python", "c#"]

Example 2:

Javascript

const collect = require('collect.js');  
    
let arr = [1, 2, 3, 4];  
    
const collection = collect(arr); 
  
collection.unless(false,  
    items => items.push(5, 6, 7)); 
    
let newObject =  collection.all();    
        
console.log(newObject);

Output:

[1, 2, 3, 4, 5, 6, 7]

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