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I am trying to find the average the sum of digits of a number.

For example, for the number 123, the sum of digits of 123 is 6 and the number of digits in 123 is 3.

So, the average of digits of 123 is 6/3 = 2.

I’ve only gotten as far as trying to find the sum through recursion unfortunately and often comes up as undefined. If I could figure this out I could find the average comfortably.

```
function averageOfDigits(number) {
// Make the whole number into a string first to get the individual digits
let arrOfStr = number.toString().split('');
// Convert this array into integers
let arrOfNum = arrOfStr.map(parseFloat)
// Find sum of these digits using recursion
let sum = function sumRecursion (arrOfNum) {
if (arrOfNum.length === 1) {
return arrOfNum[0]
} else {
return arrOfNum.pop() + sum(arrOfNum)
}
}
}
console.log(averageOfDigits(999))
```

### >Solution :

It’s missing the initial call to the recursive function.

Hint:

```
return (function sum(arr) {
if (arr.length === 1) {
return arr[0]
} else {
return arr.pop() + sum(arr)
}
}(arrOfNum))
```