public int IndexOf (int el) {

        // Copy the elements array
        int[] tmp = elements;

        while (true) {

            int middleIndex = (int)Math.floor(tmp.length/2);
            int value = tmp[middleIndex];

            if (el < value) {
                // Element is in the lower half

                tmp = elements[0 - middleIndex];

            } else if (el > value){
                // Element is in the upper half



            } else {
                // Element is equal to the middle value
                return middleIndex;
            }


        }


    }