Collect.js whenNotEmpty() Function

Collect.js is a fluent and convenient wrapper for working with arrays and objects. The whenNotEmpty() function executes the callback function when the collection is not empty.

Installation: Install the Collect.js module using the following command:

npm install --save collect.js

Syntax:

collection.whenNotEmpty(callback)

Parameters: This function takes only one parameter i.e. the callback function which executes if the collection is not empty.

Return Value: This function returns the new collection object.

Example 1: Filename-index.js 

Javascript

// Requiring module
const collect = require('collect.js')

// User defined collection
var myCollection = [
    'Good Morning',
    'Good Evening',
    'Good Afternoon'
]

// Creating collection object
const collection = collect(myCollection);

// Function call for single insertion
collection.whenNotEmpty(item => item.push('Good Night'));

// Printing collection
console.log(collection.all());

Run the index.js file using the following command:

node index.js

Output:

[ 'Good Morning', 'Good Evening', 'Good Afternoon', 'Good Night' ]

Example 2: Filename-index.js 

Javascript

// Requiring module
const collect = require('collect.js')

// User defined collection
var myCollection = ['One', 'Two', 'Three']

// Creating collection object
const collection = collect(myCollection);

// Function call for multiple insertion
collection.whenNotEmpty((item) => {
  item.push('Four')
  item.push('Five')
  item.push('Six')
});

// Printing collection
console.log(collection.all());

Run the index.js file using the following command:

node index.js

Output:

[ 'One', 'Two', 'Three', 'Four', 'Five', 'Six' ]

Reference: https://collect.js.org/api/whenNotEmpty.html