如何在javascript中最有效地对规范化数据进行反规范化

const users = [
  { id: 1, name: 'Alice', departmentId: 1 },
  { id: 2, name: 'Bob', departmentId: 2 }
];

const departments = [
  { id: 1, name: 'Engineering' },
  { id: 2, name: 'Marketing' }
];

function denormalizeData(users, departments) {
  const departmentMap = new Map(departments.map(dept => [dept.id, dept]));
  return users.map(user => ({
    ...user,
    department: departmentMap.get(user.departmentId)
  }));
}

const denormalizedData = denormalizeData(users, departments);
console.log(denormalizedData);

[
  { id: 1, name: 'Alice', departmentId: 1, department: { id: 1, name: 'Engineering' } },
  { id: 2, name: 'Bob', departmentId: 2, department: { id: 2, name: 'Marketing' } }
]

function denormalizeDataWithPagination(users, departments, pageSize = 10) {
  const departmentMap = new Map(departments.map(dept => [dept.id, dept]));
  const result = [];
  for (let i = 0; i < users.length; i += pageSize) {
    const pageUsers = users.slice(i, i + pageSize);
    result.push(...pageUsers.map(user => ({
      ...user,
      department: departmentMap.get(user.departmentId)
    })));
  }
  return result;
}

const denormalizedDataWithPagination = denormalizeDataWithPagination(users, departments, 1);
console.log(denormalizedDataWithPagination);