如何按特定键在数组中按字母顺序对对象进行分组？

const arr = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 },
  { name: 'Amy', age: 28 },
  { name: 'David', age: 32 }
];

const groupedObj = arr.reduce((result, obj) => {
  const key = obj.name[0].toUpperCase(); // 获取首字母并转为大写作为分组依据
  if (!result[key]) {
    result[key] = [];
  }
  result[key].push(obj);
  return result;
}, {});

console.log(groupedObj);

{
  A: [
    { name: 'Alice', age: 25 },
    { name: 'Amy', age: 28 }
  ],
  B: [
    { name: 'Bob', age: 30 }
  ],
  C: [
    { name: 'Charlie', age: 35 }
  ],
  D: [
    { name: 'David', age: 32 }
  ]
}