Hello, I was able to pass the previous challenge but this one was more difficult but I realized I don’t fully understand the storing of data. I understand the for loop and nested for loop but I don’t quite understand why the the following code

`let largestNumber = arr[i][0];`

Is after the first for loop. Can someone tell me which lesson I could go back to to master this basic information?

```
**Your code so far**
```

```
function largestOfFour(arr) {
let results = [];
for (let i = 0; i < arr.length; i++) {
let largestNumber = arr[i][0];
for (let j = 1; j < arr[i].length; j++) {
if (arr[i][j] > largestNumber) {
largestNumber = arr[i][j];
}
}
results[i] = largestNumber;
}
return results;
}
```

```
**Your browser information:**
```

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36 Edg/96.0.1054.53`

**Challenge:** Return Largest Numbers in Arrays

**Link to the challenge:**