Collect.js unique() Method

The unique() method is used to return the all of the unique values in the collection.

Syntax:

collect(array).unique()

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

Return Value: This method returns all of the unique items in the collection.

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

Example 1:

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

let arr = [1, 2, 3, 4, 5, 4, 3, 2, 1];

const collection = collect(arr);

const unique = collection.unique();

let newObject =  unique.all();

console.log(newObject);

Output:

[1, 2, 3, 4, 5]

Example 2:

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

let obj = [
    {
        name: 'Kripamoy',
        dob: '03-03-98',
        section: 'A',
        score: 94,
    },
    {
        name: 'Biltu',
        dob: '23-01-96',
        section: 'B',
        score: 85,
    },
    {
        name: 'Santanu',
        dob: '23-01-98',
        section: 'B',
        score: 98,
    },
    {
        name: 'chinmoy',
        dob: '18-08-97',
        section: 'A',
        score: 72
    }
];

const collection = collect(obj);

const unique = collection.unique('section');

let newObject =  unique.all();

console.log(newObject);

Output:

[
 {name: "Kripamoy", dob: "03-03-98", score: 94, section: "A"},
 {name: "Biltu", dob: "23-01-96", score: 85, section: "B"}
]