Collect.js only() Method

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' }