Javascript fetch group total results by key

// 模拟从 API 获取的用户数据
const users = [
  { id: 1, name: 'Alice', role: 'admin' },
  { id: 2, name: 'Bob', role: 'user' },
  { id: 3, name: 'Charlie', role: 'admin' },
  // ...更多用户数据
];

// 使用 fetch 模拟从 API 获取数据
function fetchUsers() {
  return new Promise((resolve) => {
    setTimeout(() => resolve(users), 1000);
  });
}

// 按 role 分组并计算总数
async function groupUsersByRole() {
  const response = await fetchUsers();
  const groupedUsers = response.reduce((acc, user) => {
    acc[user.role] = (acc[user.role] || 0) + 1;
    return acc;
  }, {});

  console.log(groupedUsers);
}

groupUsersByRole();

async function fetchWithErrorHandling() {
  try {
    const response = await fetch('https://api.example.com/data');
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    const data = await response.json();
    console.log(data);
  } catch (error) {
    console.error('Fetch error:', error);
  }
}