Collect.js keys() Method

The keys() method is used to return all of the collection’s keys.

Syntax:

collect(array).keys()

Parameters: The collect() method takes one argument that is converted into the collection and then keys() method is applied on it. 

Return Value: This method returns the collection keys.

Below example illustrate the keys() method in collect.js:

Example 1:

const collect = require('collect.js');

const collection = collect({
    name: 'Rahul',
    dob: '25-10-96',
    section: 'A',
    score: 98,
});

const keys_val = collection.keys();

console.log(keys_val.all());

Output:

[ 'name', 'dob', 'section', 'score' ]

Example 2:

const collect = require('collect.js');

let obj = [
    {
        name: 'Rahul',
        dob: '25-10-96',
        section: 'A',
        score: 98,
    },
    {
        name: 'Aditya',
        dob: '25-10-96',
        section: 'B',
        score: 96,
    },
    {
        name: 'Abhishek',
        dob: '16-08-94',
        section: 'A',
        score: 80
    },
    {
        name: 'Rahul',
        dob: '19-08-96',
        section: 'B',
        score: 77,
    },
];

const collection = collect(obj);

const keys_val = collection.keys();

console.log(keys_val.all());

Output:

[ 0, 1, 2, 3 ]