可以对这种数组进行分组吗？[Javascript]

const arr = [
  { name: 'Alice', age: 20 },
  { name: 'Bob', age: 25 },
  { name: 'Charlie', age: 20 },
  { name: 'Dave', age: 25 }
];

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

console.log(grouped);

{
  20: [
    { name: 'Alice', age: 20 },
    { name: 'Charlie', age: 20 }
  ],
  25: [
    { name: 'Bob', age: 25 },
    { name: 'Dave', age: 25 }
  ]
}