Stuck in Step 5 in Credit Card Checker

First of all, I don’t know why it keeps showing augmented form of credit card numbers, even if I used const inside the functions, this made me unable to identify the first number of the original array such as invalid1 or invalid3 .

My codes can only make the computer show the index of the batch array. Any chance this can still work or do I have to start from scratch all over again? :smiling_face_with_tear: :smiling_face_with_tear:

function validateCred(arr) {
  const reversedArray = arr.reverse()
  const doubledArray = [];
  for (let i = 0; i < reversedArray.length; i++) {
    if (i === 0) {
      arr[i] *= 1;
    } else if (i === 1 || i % 2 === 1) {
      arr[i] *= 2;
    }
    doubledArray.push(arr[i]);
  }
  //console.log(doubledArray)
  const finalArray = [];
  for (let j = 0; j < doubledArray.length; j++) {
    if (doubledArray[j] > 9) {
      doubledArray[j] -= 9;
    }
    finalArray.push(doubledArray[j]);
  }
  //console.log(finalArray)
  const sum = finalArray.reduce((a, b) => a + b, 0);
  //console.log(sum)
  if (sum % 10 === 0) {
    return "valid";
  } else return "invalid";
}

 function findInvalidCards(arr3) {
  const results = [];
  for (let k = 0; k < arr3.length; k++) {
    if (validateCred(arr3[k]) === "invalid") {
      results.push(k);
    }
  }
  return results
}

const index = findInvalidCards(batch);
console.log(index);
console.log(batch[index[0]])