How to find duplicate elements length in array flutter?
Solution 1:
here is your solution. [Null Safe]
void main() {
List<int> items = [1, 1, 1, 2, 3, 4, 5, 5];
Map<int, int> count = {};
items.forEach((i) => count[i] = (count[i] ?? 0) + 1);
print(count.toString()); // {1: 3, 2: 1, 3: 1, 4: 1, 5: 2}
}