The large array on the right contains 4 decimal groups, each of which finds the maximum value in each decimal group, and then concatenates them together to form a new array.

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]])An array should be returned largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])should return [27,5,39,1001]. largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]])should return [9, 35, 97, 1000000].

The large array on the right contains 4 decimal groups, each of which finds the maximum value in each decimal group, and then concatenates them together to form a new array.