Answer 1

const arr = Array.from({
        length: 10
      }, () => ~~(Math.random() * 50)) //创建数据
      .sort((a, b) => a - b), //排序
      arr1 = [...new Set(arr.map(i => ~~(i / 10)))] //划分区域
      .map(i => arr.filter(a => ~~(a / 10) === i)) //数据划分

你这操作有点6