js find duplicates in array

function getDuplicateArrayElements(arr){
    var sorted_arr = arr.slice().sort();
    var results = [];
    for (var i = 0; i < sorted_arr.length - 1; i++) {
        if (sorted_arr[i + 1] === sorted_arr[i]) {
            results.push(sorted_arr[i]);
        }
    }
    return results;
}

var colors = ["red","orange","blue","green","red","blue"];
var duplicateColors= getDuplicateArrayElements(colors);//["blue", "red"]

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3.5

Wjandrea 105 points

                                    const names = ['Mike', 'Matt', 'Nancy', 'Adam', 'Jenny', 'Nancy', 'Carl']

const count = names =&gt;
  names.reduce((a, b) =&gt; ({ ...a,
    [b]: (a[b] || 0) + 1
  }), {}) // don't forget to initialize the accumulator

const duplicates = dict =&gt;
  Object.keys(dict).filter((a) =&gt; dict[a] &gt; 1)

console.log(count(names)) // { Mike: 1, Matt: 1, Nancy: 2, Adam: 1, Jenny: 1, Carl: 1 }
console.log(duplicates(count(names))) // [ 'Nancy' ]

Thank you! 2

3.5 (2 Votes)

3.5

Mythio 120 points

                                    [1, 2, 2, 4, 3, 4].filter((e, i, a) =&gt; a.indexOf(e) !== i) // [2, 4]

Thank you! 2

3.5 (2 Votes)

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js find duplicates in array

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