Whats rong please and how n return first element

Tell us what’s happening:

Your code so far

function sum(arr, n) {
// Only change code below this line
if(n<=o) {
  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 (Linux; Android 9; SM-A105F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Mobile Safari/537.36.

Challenge: Replace Loops using Recursion

Link to the challenge:

You have a typo. n <= 0