从数组中删除重复对象，但合并嵌套对象

const data = [
  { id: 1, name: 'Alice', details: { age: 25, city: 'New York' } },
  { id: 2, name: 'Bob', details: { age: 30, city: 'Los Angeles' } },
  { id: 1, name: 'Alice', details: { age: 26, city: 'Chicago' } },
  { id: 3, name: 'Charlie', details: { age: 35, city: 'San Francisco' } }
];

const result = data.reduce((acc, current) => {
  const existing = acc.find(item => item.id === current.id);
  if (existing) {
    // 合并嵌套对象
    existing.details = { ...existing.details, ...current.details };
  } else {
    acc.push(current);
  }
  return acc;
}, []);

console.log(result);

const mergeDetails = (existingDetails, currentDetails) => {
  return {
    age: existingDetails.age || currentDetails.age,
    city: existingDetails.city || currentDetails.city
  };
};

const result = data.reduce((acc, current) => {
  const existing = acc.find(item => item.id === current.id);
  if (existing) {
    existing.details = mergeDetails(existing.details, current.details);
  } else {
    acc.push(current);
  }
  return acc;
}, []);