```
function sum(arr, n) {
// Only change code below this line
if(n=0){ //HERE ! WHY [ if(n=0)] WON'T WORK ??
return arr[0];
}else {
return sum(arr,n-1)+arr[n];
}
// Only change code above this line
}
```

Above , at the 4rth line if i put [if(n=0)] instead of [if(n<=0)] won’t work. The value of n will never go below zero . Then why n=0 won’t work !!