Add and Subtract

function addOrSubtract(arr) {
  let arrNew = [];
  let arrNewSum = 0;
  let arrSum = 0;

  for (let i = 0; i < arr.length; i++) {
    arrSum += arr[i];
    let result = arr[i];
    if (result % 2 === 0) {
      result += i;
      arrNewSum += result;
    } else {
      result -= i;
      arrNewSum += result;
    }

    arrNew.push(result);
  }
  console.log(arrNew);
  console.log(arrSum);
  console.log(arrNewSum);
}
addOrSubtract([5, 15, 23, 56, 35]);