Collect.js unique() Method

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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"}
]

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