Collect.js is a fluent and convenient wrapper for working with arrays and objects. The unlessEmpty() 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.unlessEmpty(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 = [1, 2] // Creating collection object const collection = collect(myCollection); // Callback execution since collection // object is not empty collection.unlessEmpty(item => item.push(3)); // Printing collection console.log(collection.all()); |
Run the index.js file using the following command:
node index.js
Output:
[ 1, 2, 3 ]
Example 2: Filename-index.js
Javascript
// Requiring module const collect = require('collect.js') // User defined collection var myCollection = [] // Creating collection object const collection = collect(myCollection); // No callback execution since // collection is not empty collection.unlessEmpty((item) => { item.push(1) item.push(2) }); // Printing collection console.log(collection.all()); |
Run the index.js file using the following command:
node index.js
Output:
[ ]
Reference: https://collect.js.org/api/unlessEmpty.html
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