javascript check if array has duplicates

function hasDuplicates(array) {
    return (new Set(array)).size !== array.length;
}

3.8
5

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

3.8 (5 Votes)
0
0
9

                                    [1, 2, 3].every((e, i, a) => a.indexOf(e) === i) // true

[1, 2, 1].every((e, i, a) => a.indexOf(e) === i) // false

0
0
4
10
JStrange 120 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;]

4 (10 Votes)
0
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