Solution

// Complete the rotLeft function below.
    static int[] rotLeft(int[] a, int d) {
        for(int i = 0; i < d; i++){
            int lastIndex = a.length - 1;

            //Hold first element
            int temp = a[0];
            for(int index = 0; index < lastIndex; index++){
                a[index] = a[index + 1];
            }

            //Set last element to the prev first
            a[lastIndex] = temp;
        }

        return a;
    }