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function largestOfFour(arr) {
    return arr.map(function(subArr) {
      return Math.max.apply(null, subArr);
    });
  }
  
  // Moje
  
  function largestOfFour(arr) {
  for (var i = 0; i < arr.length; i++) {  
    arr[i].sort(function(a, b){return b-a});
    }    
  var arr2 = [];
  for (var j = 0; j < arr.length; j++) { 
     arr2.push(arr[j][0]);
    }
  return arr2; 
  }