Running sum until a negative number

Question

Please how can I use the index 0 in a for-loop when testing an empty array for a drumming sum. Also, the single negative value returns zero The sum should stop when a negative number is encountered

  let sum = 0;

  let lenArr = arr.length;

  for (let i = 0; i <= lenArr - 1; i++) {
    if (lenArr === 0) {
      break;
    }

    if (arr[i] > 0) {
      sum = sum + arr[i];
    } else {
      break;
    }
  }

  return sum;
}

let input = [];

runningSum(input);

Answer 1

For an empty array the for loop would not be executed and it will return 0. You can remove the if condition to check length of array inside for loop.