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compare two arrays and remove duplicates javascript

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Tony Chanel answered on April 27, 2020 Popularity 9/10 Helpfulness 4/10

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compare two arrays and remove duplicates javascript

Comment

array1 = array1.filter(function(val) {
  return array2.indexOf(val) == -1;
});

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: arrays compare javascript

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Contributed on Sep 08 2021

Tony Chanel

0 Answers Avg Quality 2/10

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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 remove duplicate in two arrays

Comment

array1 = array1.filter(function(val) {
  return array2.indexOf(val) == -1;
});
// Or, with the availability of ES6:

array1 = array1.filter(val => !array2.includes(val));

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: arrays ar

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Contributed on Apr 27 2020

MM.Mirzaei.Dev

0 Answers Avg Quality 2/10

Remove Duplicates array values in javascript

Comment

const array  = [5,4,7,8,9,2,7,5];
array.filter((item,idx,arr) => arr.indexOf(item) === idx);
// or
const nonUnique = [...new Set(array)];
// Output: [5, 4, 7, 8, 9, 2]

Popularity 9/10 Helpfulness 6/10 Language javascript

Source: dev.to

Tags: javascript j

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Contributed on Jul 18 2022

Poised Peacock

0 Answers Avg Quality 2/10

javascript remove duplicates from array

Comment

// for TypeScript and JavaScript
const initialArray = ['a', 'a', 'b',]
finalArray = Array.from(new Set(initialArray)); // a, b

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Apr 17 2021

Cheerful Cat

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 remove duplicates from array

Comment

var myArr = [1, 2, 2, 2, 3];
var mySet = new Set(myArr);
myArr = [...mySet];
console.log(myArr);
// 1, 2, 3

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 11 2020

Thoughtful Tamarin

0 Answers Avg Quality 2/10

javascript remove duplicates from array

Comment

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

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 03 2020

Batman

0 Answers Avg Quality 2/10

javascript compare arrays remove duplicates

Comment

var arr1 = [1, 2, 3, 4, 5];
var arr2 = [1, 3, 5, 7, 9];


arr2 = arr2.reduce(function (prev, value) {

    var isDuplicate = false;
    for (var i = 0; i < arr1.length; i++) {
        if (value == arr1[i]) {
            isDuplicate = true;
            break;
        }
    }
      
    if (!isDuplicate) {
        prev.push(value);
    }
       
    return prev;
        
}, []);


alert(JSON.stringify(arr2));
 Run code snippet

Popularity 8/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: arrays compare co

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Contributed on Mar 31 2022

Harry Fahringer III

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

remove duplicates from array javascript

Comment

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']

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Mar 16 2021

Sparkling Salamander

0 Answers Avg Quality 2/10

compare two arrays and remove duplicates javascript

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remove duplicates from array javascript

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