javascript check if array has duplicates
function hasDuplicates(array) {
return (new Set(array)).size !== array.length;
}
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3.8
5
arr.reduce((b,c)=>((b[b.findIndex(d=>d.el===c)]||b[b.push({el:c,count:0})-1]).count++,b),[]);
Thank you!
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[1, 2, 3].every((e, i, a) => a.indexOf(e) === i) // true
[1, 2, 1].every((e, i, a) => a.indexOf(e) === i) // false
Thank you!
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function getDuplicateArrayElements(arr){<br/> var sorted_arr = arr.slice().sort();<br/> var results = [];<br/> for (var i = 0; i < 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 = ["red","orange","blue","green","red","blue"];<br/>var duplicateColors= getDuplicateArrayElements(colors);//["blue", "red"]
Thank you!
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find duplicate in array js