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const array = [1, 2, 3, 3, 4, 5, 6, 7, 8, 7]
const nonUnique = array.filter((current, index) => array.indexOf(current) !== index)
console.log(nonUnique)
[...[1, 2, 3, 3, 4, 5, 6, 7, 8, 7].reduce((acc, cur, idx, arr) => {
if (arr.indexOf(cur, idx + 1) > -1) {
acc.add(cur)
}
return acc
}, new Set([]))]
S
[...[1, 2, 3, 3, 4, 5, 6, 7, 8, 7].reduce((acc, cur, idx, arr) => {
if (arr.indexOf(cur, idx + 1) > -1) {
acc.add(cur)
}
return acc
}, new Set([]))]
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