Collect.js only() Method

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The only() method is used to return the items from the given collection with the specified keys. It takes the key as a parameter and returns the item mapped with that key.

Syntax:

collect(array).only(key)

Parameters: The collect() method takes one argument that is converted into the collection and then only the () method is applied to it. The only() method holds the key as a parameter.

Return Value: This method returns the items from the given collection with the specified keys.

Module Installation: Install collect.js module using the following command from the root directory of your project:

npm install collect.js

The below example illustrates the only() method in collect.js:

Example 1: Filename: index.js

Javascript

// Requiring the module 
const collect = require('collect.js'); 
  
// Sample values array 
let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]; 
  
// Creating collection object 
const collection = collect(arr); 
  
// Function call 
const only_val = collection.only([2, 5, 25]); 
  
// Printing the values 
console.log(only_val.all());

Run the index.js file using the following command:

node index.js

Output:

[ 2, 5 ]

Example 2: Filename: index.js

Javascript

// Requiring the module 
const collect = require('collect.js'); 
  
// Creating collection object 
const collection = collect({ 
    name: 'Rahul', 
    dob: '25-10-96', 
    section: 'A', 
    score: 98, 
}); 
  
// Function call 
const only_val = collection.only(['name', 'dob']); 
  
// Printing the values 
console.log(only_val.all());

Run the index.js file using the following command:

node index.js

Output:

{ name: 'Rahul', dob: '25-10-96' }

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