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berat/find Duplicate item

Created June 22, 2020 10:46
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find Duplicate item
let arr = [1, 2, 3, 3, 4, 5, 6, 7, 7, 7];
const findDuplicates = (arr) => arr.filter(( item, index ) => arr.indexOf(item) != index);
console.log([...new Set(findDuplicates(arr))])
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