replace loops using recursion

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1//Write a recursive function, sum(arr, n), that returns the sum of the first n elements of an array arr.
2  /* 1) sum([1], 0) should equal 0.
3     2) sum([2, 3, 4], 1) should equal 2.
4     3) sum([2, 3, 4, 5], 3) should equal 9. */
5     
6function sum(arr, n) {
7    if(n <= 0) {
8      return 0;
9    } else {
10      return sum(arr, n - 1) + arr[n - 1];
11    }
12  }
13
14

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