how to count duplicates in an array javascript

var array = [1, 2, 2, 3, 3, 4, 5, 6, 2, 3, 7, 8, 5, 22, 1, 2, 511, 12, 50, 22];

console.log([...new Set(
  array.filter((value, index, self) => self.indexOf(value) !== index))]
);

4
5

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

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

const duplicates = dict =>
  Object.keys(dict).filter((a) => dict[a] > 1)

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

4 (5 Votes)
0
3.33
3
Jay Cossey 85 points

                                    function getDuplicateArrayElements(arr){<br/>    var sorted_arr = arr.slice().sort();<br/>    var results = [];<br/>    for (var i = 0; i &lt; sorted_arr.length - 1; i++) {<br/>        if (sorted_arr[i + 1] === sorted_arr[i]) {<br/>            results.push(sorted_arr[i]);<br/>        }<br/>    }<br/>    return results;<br/>}<br/><br/>var colors = [&quot;red&quot;,&quot;orange&quot;,&quot;blue&quot;,&quot;green&quot;,&quot;red&quot;,&quot;blue&quot;];<br/>var duplicateColors= getDuplicateArrayElements(colors);//[&quot;blue&quot;, &quot;red&quot;]

3.33 (3 Votes)
0
3.75
4
Null_Error 105 points

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

3.75 (4 Votes)
0
5
2

                                    arr.reduce((b,c)=&gt;((b[b.findIndex(d=&gt;d.el===c)]||b[b.push({el:c,count:0})-1]).count++,b),[]);

5 (2 Votes)
0
0
0

                                    var counts = {};
your_array.forEach(function(x) { counts[x] = (counts[x] || 0)+1; });

0
0
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