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javascript Return an array consisting of the largest number

 Return an array consisting of the largest number . 

题目:

返回一个数组,该数组由每个提供的子数组中的最大数组成。 

比如:

arraysInArray = [[4513], [13271826], [32353739], [100010018571]]
我的思路是:
外圈一个大的for循环对大数组中的小数组遍历,内部一个for循环对每个小数组的每个元素进行遍历,用一个变量存储最大的值,用另一个变量记录最大的值所在的小数组在大数组
中的index,最后返回这个arr[index],也就是一个小数组。

function largestOfFour(arr) {
  let largestNum = 0;//存储最大数
  let index = 0;//存储最大数所在的array的序号
  for (let i=0;i<arr.length;i++)//数组中的数组
  {
    for(let j=0;j<arr[i].length;j++)//对每个小数组进行循环判断
    {
      if (largestNum<=arr[i][j])
      {
        largestNum = arr[i][j];
        index = i;//每次更新index为最大值所在的小数组的index
      }

    }
  }
  return arr[index];
}
console.log(largestOfFour([[4513], [13271826], [32353739], [100010018571]]))
largestOfFour([[4513], [13271826], [32353739], [100010018571]]);

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