javascript to remove duplicates from an array

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

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

4.1
10
Laurie R 120 points

                                    function onlyUnique(value, index, self) {
  return self.indexOf(value) === index;
}

// usage example:
var a = ['a', 1, 'a', 2, '1'];
var unique = a.filter(onlyUnique);

console.log(unique); // ['a', 1, 2, '1']

4.1 (10 Votes)
0
4.5
8
Mariam Amr 70 points

                                    let a = [10,20,30,50,30];
let b = a.reduce((unique,item) => unique.includes(item) ? unique: [... unique, item] ,[]); 
console.log(b);

4.5 (8 Votes)
0
0
1
Khyati 105 points

                                    unique = [...new Set(arr)];   // where arr contains duplicate elements

0
0
3.8
10
Jatin jazz 110 points

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

3.8 (10 Votes)
0
4
3
Arch1ve 105 points

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

4 (3 Votes)
0
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