Return Largest Numbers in Arrays with dual for loops

Tell us what’s happening:

Your code so far

function largestOfFour(arr) {
  // You can do this!
  max = 0;
  for(i=0;i<arr.length;i++){
    for(j=0;j<arr[i];j++){
      if(arr[i][j] > max)
        {
         max = arr[i][j];
        }
    }
  }
} 
largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);

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Link to the challenge: