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how to delete duplicate elements in an array in javascript

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praja wani answered on March 11, 2020 Popularity 9/10 Helpfulness 4/10

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//Other Mathod using Foreach and includes
let chars = ['A', 'B', 'A', 'C', 'B'];

let uniqueChars = [];
chars.forEach((c) => {
    if (!uniqueChars.includes(c)) {
        uniqueChars.push(c);
    }
});

console.log(uniqueChars);

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: elements javascript

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Contributed on Mar 03 2022

praja wani

0 Answers Avg Quality 2/10

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js delete duplicates from array

Comment

139

const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

let unique = [...new Set(names)];
console.log(unique); // 'John', 'Paul', 'George', 'Ringo'

Popularity 10/10 Helpfulness 9/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 11 2020

Wandering Weevil

0 Answers Avg Quality 2/10

removing duplicates in array javascript

Comment

let arr = [1,2,3,1,1,1,4,5]
    
let filtered = arr.filter((item,index) => arr.indexOf(item) === index)
    
 console.log(filtered) // [1,2,3,4,5]

Popularity 10/10 Helpfulness 8/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Apr 08 2021

Runtime Terror

0 Answers Avg Quality 2/10

how to remove duplicates from array in javascript

Comment

// how to remove duplicates from array in javascript
// 1. filter()
let num = [1, 2, 3, 3, 4, 4, 5, 5, 6];
let filtered = num.filter((a, b) => num.indexOf(a) === b)
console.log(filtered);
// Result: [ 1, 2, 3, 4, 5, 6 ]

// 2. Set()
const removeDuplicates = (arr) => [...new Set(arr)];
console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));
// Result: [ 1, 2, 3, 4, 5, 6 ]

Popularity 10/10 Helpfulness 7/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 07 2022

Chetan Nada

0 Answers Avg Quality 2/10

javascript to remove duplicates from an array

Comments(1)

uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos; 
})

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Oct 22 2020

Awful Albatross

0 Answers Avg Quality 2/10

javascript to remove duplicates from an array

Comment

uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos;
})

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Oct 22 2020

Awful Albatross

0 Answers Avg Quality 2/10

Javascript removing duplicates in array

Comment

const array = [1, 1, 2, 3, 5, 5, 1]
const uniqueArray = [...new Set(array)];

console.log(uniqueArray); // Output: [1, 2, 3, 5]

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: thecodingcompany.hashnode.dev

Tags: javascript j

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Contributed on Sep 14 2021

Average Addax

0 Answers Avg Quality 2/10

js delete duplicates from array

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const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

function removeDups(names) {
  let unique = {};
  names.forEach(function(i) {
    if(!unique[i]) {
      unique[i] = true;
    }
  });
  return Object.keys(unique);
}

removeDups(names); // // 'John', 'Paul', 'George', 'Ringo'

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 11 2020

Wandering Weevil

0 Answers Avg Quality 2/10

remove duplicates from an array in javascript

Comment

[...new Set(['1','1','2','2','3','3'])]
//this will return a new array with the unique primitive values
//I guess doing this with objects will require implementing equality method.

Popularity 8/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 10 2023

Chache17

0 Answers Avg Quality 2/10

remove duplicates in an Array in Javascript

Comment

let chars = ['A', 'B', 'A', 'C', 'B'];
let uniqueChars = [...new Set(chars)];

console.log(uniqueChars);

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: dev.to

Tags: javascript j

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Contributed on Dec 29 2021

Cutecub Follower

0 Answers Avg Quality 2/10

how to delete duplicate elements in an array in javascript

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