function largestOfFour(arr) {
  var array = [];
  
  for (var i in arr) {
    array.push(arr[i].sort(function (a, b) {
      return b- a;
    })[0]); 
  }
  
  return array;
}

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

  

largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]])应该返回一个数组
 
 
largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])应该返回 [27,5,39,1001].
 
 
largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]]) 应该返回 [9, 35, 97, 1000000].

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