returnLargestNumberinArray.js

largest = 0;
result = [];
function largestOfFour(arr) {
  for(i=0;i<arr.length;i++){
    group = arr[i]
    for(j=0;j<group.length;j++){
     if(group[j] > largest){
       largest = group[j];
     }
    }
  result.push(largest);
  largest=0;
  }
  return result;
}

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