Collect.js whenEmpty() Function

Collect.js is a fluent and convenient wrapper for working with arrays and objects. The whenEmpty() function executes the callback function when the collection is empty. 

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

npm install --save collect.js

Syntax:  

collection.whenEmpty(callback)

Parameters: This function takes only one parameter i.e. the callback function which executes if the collection is empty.

Return Value: This function returns the new collection object.

Example 1: Filename-index.js 

Run the index.js file using the following command:

node index.js

Output:

[ 'Greetings' ]

Example 2: Filename-index.js 

Run the index.js file using the following command:

node index.js

Output:

[ 'One', 'Two', 'Three']

Reference: https://collect.js.org/api/whenempty