Collect.js whereNull() Method

Collect.js when() Method

Last Updated : 03 Dec, 2020

The when() method is used to execute the given callback when the first argument given to the method evaluates to true.

Syntax:

collect.when()

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

Return Value: This method returns the merged collection elements.

Below example illustrate when() method in collect.js:

Example 1:

Javascript

const collect = require('collect.js');  
     
let arr = ['C++', 'java', 'python'];  
     
const collection = collect(arr); 
   
collection.when(true, 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.when(true, items => items.push(5, 6, 7)); 
     
let newObject =  collection.all();    
         
console.log(newObject);

Output:

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

Collect.js whereNull() Method

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