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javascript remove uniques from array

Web Surfer answered on November 9, 2020 Popularity 10/10 Helpfulness 4/10

answer javascript remove uniques from array

related javascript filter unique

javascript remove uniques from array

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function getNotUnique(array) {
    var map = new Map();
    array.forEach(a => map.set(a, (map.get(a) || 0) + 1));
    return array.filter(a => map.get(a) > 1);
}

console.log(getNotUnique([1, 2, 2, 4, 4])); //[2, 2, 4, 4]
console.log(getNotUnique([1, 2, 3] )); //[]

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: javascript

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Contributed on Nov 09 2020

Web Surfer

0 Answers Avg Quality 2/10

Closely Related Answers

javascript filter unique

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']
 Run code snippet

Popularity 9/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: filter fi

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