Largest number in an array of subarrays

Tell us what’s happening:
Describe your issue in detail here.
Hello,
I have been having difficulty detecting my mistake in this code. I would appreciate any hint.

  **Your code so far**

function largestOfFour(arr) {
let newArr = [];
for(let i = 0; i < arr.length; ++i) {
  for(let a = 0; a < arr[i].length; ++a) {
    newArr[i] = arr[i][0];
    if(arr[i][a] > newArr[i]) newArr[i] = arr[i][a];
  }
}
return newArr;
}

largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);

  **Your browser information:**

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Challenge: Return Largest Numbers in Arrays

Link to the challenge:

This line:

newArr[i] = arr[i][0];

This line here… I get what you are trying to do, but is that the right place for it? I was able to move this line and get your code to pass. But don’t try random places to put it, understand why.

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