Collect.js whenEmpty() Function
Last Updated :
13 Jun, 2022
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
const collect = require( 'collect.js' )
var myCollection = []
const collection = collect(myCollection);
collection.whenEmpty(item => item.push( 'Greetings' ));
console.log(collection.all());
|
Run the index.js file using the following command:
node index.js
Output:
[ 'Greetings' ]
Example 2: Filename-index.js
Javascript
const collect = require( 'collect.js' )
var myCollection = [ 'One' , 'Two' , 'Three' ]
const collection = collect(myCollection);
collection.whenEmpty((item) => {
item.push( 'Four' )
item.push( 'Five' )
item.push( 'Six' )
});
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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