Recursive Hulabaloos

Tell us what’s happening:
Describe your issue in detail here.

I feel like i somewhat conceptually understand recursion. But in this problem why are we adding " arr[n - 1]" se seen below.

return sum(arr, n - 1) + arr[n - 1];

it makes more sense to me to say " + arr [n];

  **Your code so far**
function sum(arr, n) {
// Only change code below this line
function sum(arr, n) {
  if(n <= 0) {
    return 0;
  } else {
    return sum(arr, n - 1) + arr[n - 1];
// Only change code above this line
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36

Challenge: Replace Loops using Recursion

Link to the challenge:

Arrays index starting at 0

Thank a million, it finally just clicked

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