C++ Solution:

vector rotateLeft(int d, vector arr) {

auto calcOldIndex = [](int newIndex, int shift, int size) 
{
    int tmp = newIndex + shift;
    if(tmp >= size)
        tmp = tmp - size;
    return tmp;
};

vector<int> res;

for(int i = 0; i < (int)arr.size(); i++){
    res.push_back(arr[calcOldIndex(i, d, arr.size())]);
}
return res;

}