check if array has same values javascript

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Helena
21 Oct 2020
1const found = arr1.some(r=> arr2.includes(r))
source
Emely
18 Mar 2020
1const allEqual = arr => arr.every(v => v === arr[0]);
2allEqual([1,1,1,1]);  // true
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Roberto
20 Apr 2020
1function hasDuplicates(array) {
2    return (new Set(array)).size !== array.length;
3}
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