How to Remove Duplicates from array in Javascript

June 10, 2020 — 1 Min Read

There is many ways to remove duplicates from an array in Javascript.

I think that the simplest approach is to use Set Object, which lets you store unique Values. Set will automatically remove duplicates .

Here is an example

const numbers = [1, 1, 2, 3, 4, 5, 6];
let uniqueNumbers = [...new Set(numbers)];
//uniqueNumbers = [1, 2, 3, 4, 5, 6]

a Second Option is to use the filter

const numbers = [1, 1, 2, 3, 4, 5, 6, 7];

const uniqueNumbers = numbers.filter((element, pos) => {
  return numbers.indexOf(element) === pos;
});

and the Final Option is to use forEach()

const numbers = [1, 1, 2, 3, 4, 5, 6];

const uniqueNumbers = (numbers) => {
  let unique = {};
  numbers.forEach((element) => {
    if (!unique[element]) {
      unique[element] = true;
    }
  });
  return Object.keys(unique);
};

You like our Content? Follow us to stay up-to-date.