如何对数组对象进行分组和排序

// 假设有一个数组对象
const data = [
  { name: 'Alice', age: 25, group: 'A' },
  { name: 'Bob', age: 30, group: 'B' },
  { name: 'Charlie', age: 20, group: 'A' },
  { name: 'David', age: 35, group: 'C' },
  { name: 'Eve', age: 28, group: 'B' }
];

// 分组
const groups = {};
data.forEach(obj => {
  const group = obj.group;
  if (!groups[group]) {
    groups[group] = [];
  }
  groups[group].push(obj);
});

// 排序
for (const group in groups) {
  groups[group].sort((a, b) => a.age - b.age);
}

// 打印结果
for (const group in groups) {
  console.log(`Group ${group}:`);
  groups[group].forEach(obj => {
    console.log(`- ${obj.name}, age ${obj.age}`);
  });
}