Collect.js whenEmpty() Function

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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

Javascript

// Requiring module
const collect = require('collect.js')
 
// User defined collection
var myCollection = []
 
// Creating collection object
const collection = collect(myCollection);
 
// Callback execution since collection object is empty
collection.whenEmpty(item => item.push('Greetings'));
 
// Printing collection
console.log(collection.all());

Run the index.js file using the following command:

node index.js

Output:

[ 'Greetings' ]

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);
 
// No callback execution since collection is not empty
collection.whenEmpty((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']

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

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