Sep 3, 2023 Author - Sai gowtham

How to remove duplicate objects from an array in JavaScript

javascript1min read

In this tutorial, we are going to learn about how to remove the duplicate objects from an array using JavaScript.

We are using es6 map and filter methods to remove the duplicate objects from an array, where object comparison is done by using the property

consider we have an array of objects with the id and name but the same id is repeating twice.

const arr = [
  { id: 1, name: "king" },
  { id: 2, name: "master" },
  { id: 3, name: "lisa" },
  { id: 4, name: "ion" },
  { id: 5, name: "jim" },
  { id: 6, name: "gowtham" },
  { id: 1, name: "jam" },
  { id: 1, name: "lol" },
  { id: 2, name: "kwick" },
  { id: 3, name: "april" },
  { id: 7, name: "sss" },
  { id: 8, name: "brace" },
  { id: 8, name: "peiter" },
  { id: 5, name: "hey" },
  { id: 6, name: "mkl" },
  { id: 9, name: "melast" },
  { id: 9, name: "imlast" },
  { id: 10, name: "glow" }
];

Here is my implementation to remove the duplicate objects from an array.


function getUnique(arr, comp) {

                    // store the comparison  values in array
   const unique =  arr.map(e => e[comp])

                  // store the indexes of the unique objects
                  .map((e, i, final) => final.indexOf(e) === i && i)

                  // eliminate the false indexes & return unique objects
                 .filter((e) => arr[e]).map(e => arr[e]);

   return unique;
}

console.log(getUnique(arr,'id'));