This doesn't help at all, this only returns a bool true or false. How do you return all the duplicate elements of the array into a new array?
you can use
function duplicateItem(arr) { let itemCountObj = {}; let maxItem = [] for (let i = 0; i < arr.length; i++) { const item = arr[i]; itemCountObj[item] = itemCountObj[item] + 1 || 1; if (itemCountObj[item] >= 2) { maxItem.push(item); } } return maxItem; }
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This doesn't help at all, this only returns a bool true or false. How do you return all the duplicate elements of the array into a new array?
you can use