Calculate the sum of an array without using loops

public class SumNoLoop {

    public static void main(String[] args) {

        int[] array = new int[]{1, 2, 3, 4, 5};
        System.out.println(sum(array, 0));
    }

    public static int sum(int[] arr, int index) {
        if (arr.length <= index) {
            return 0;
        }
        return arr[index] + sum(arr, index + 1);

    }
}
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