javascript check if array has duplicates

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Yannick
25 Jan 2016
1function hasDuplicates(array) {
2    return (new Set(array)).size !== array.length;
3}
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Yannic
19 Jul 2019
1[1, 2, 3].every((e, i, a) => a.indexOf(e) === i) // true
2
3[1, 2, 1].every((e, i, a) => a.indexOf(e) === i) // false
4
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Maya
02 Jun 2019
1arr.reduce((b,c)=>((b[b.findIndex(d=>d.el===c)]||b[b.push({el:c,count:0})-1]).count++,b),[]);
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