如何根据对象数组中相同的值合并对象

function mergeObjectsByProperty(arr, prop) {
  let mergedObj = {};
  
  arr.forEach(obj => {
    const key = obj[prop];
    
    if (mergedObj[key]) {
      mergedObj[key].push(obj);
    } else {
      mergedObj[key] = [obj];
    }
  });
  
  return mergedObj;
}

const arr = [
  { id: 1, name: 'Alice', age: 25 },
  { id: 2, name: 'Bob', age: 30 },
  { id: 1, name: 'Charlie', age: 35 },
  { id: 3, name: 'Dave', age: 40 }
];

{
  1: [
    { id: 1, name: 'Alice', age: 25 },
    { id: 1, name: 'Charlie', age: 35 }
  ],
  2: [
    { id: 2, name: 'Bob', age: 30 }
  ],
  3: [
    { id: 3, name: 'Dave', age: 40 }
  ]
}