JS -如何根据属性值将对象数组转换为不同的组，进一步隔离数据，并聚合一些数据

const arr = [
  { name: 'Alice', group: 'A', score: 80 },
  { name: 'Bob', group: 'B', score: 90 },
  { name: 'Charlie', group: 'A', score: 85 },
  { name: 'Dave', group: 'C', score: 95 }
];

const groupedData = arr.reduce((acc, obj) => {
  const { group } = obj;
  if (!acc[group]) {
    acc[group] = [];
  }
  acc[group].push(obj);
  return acc;
}, {});

{
  A: [
    { name: 'Alice', group: 'A', score: 80 },
    { name: 'Charlie', group: 'A', score: 85 }
  ],
  B: [
    { name: 'Bob', group: 'B', score: 90 }
  ],
  C: [
    { name: 'Dave', group: 'C', score: 95 }
  ]
}

const aggregatedData = Object.keys(groupedData).reduce((acc, key) => {
  const group = groupedData[key];
  const averageScore = group.reduce((sum, obj) => sum + obj.score, 0) / group.length;
  acc[key] = { group, averageScore };
  return acc;
}, {});

{
  A: {
    group: [
      { name: 'Alice', group: 'A', score: 80 },
      { name: 'Charlie', group: 'A', score: 85 }
    ],
    averageScore: 82.5
  },
  B: {
    group: [
      { name: 'Bob', group: 'B', score: 90 }
    ],
    averageScore: 90
  },
  C: {
    group: [
      { name: 'Dave', group: 'C', score: 95 }
    ],
    averageScore: 95
  }
}