使用typescript多次分组到对象中

interface GroupedData {
  [key: string]: {
    [key: string]: any[];
  };
}

function groupByMultiple(data: any[], groupBy: string[] | ((item: any) => string)): GroupedData {
  const groupedData: GroupedData = {};

  data.forEach(item => {
    let currentGroup = groupedData;

    if (typeof groupBy === 'function') {
      const key = groupBy(item);
      if (!currentGroup[key]) {
        currentGroup[key] = {};
      }
      currentGroup = currentGroup[key];
    } else {
      groupBy.forEach(key => {
        const value = item[key];
        if (!currentGroup[value]) {
          currentGroup[value] = {};
        }
        currentGroup = currentGroup[value];
      });
    }

    if (!currentGroup.items) {
      currentGroup.items = [];
    }
    currentGroup.items.push(item);
  });

  return groupedData;
}

// 示例数据
const data = [
  { name: 'Alice', age: 25, city: 'New York' },
  { name: 'Bob', age: 30, city: 'London' },
  { name: 'Charlie', age: 25, city: 'New York' },
  { name: 'Dave', age: 35, city: 'London' },
];

// 按照年龄和城市进行分组
const groupedData = groupByMultiple(data, ['age', 'city']);

console.log(groupedData);

{
  "25": {
    "New York": {
      "items": [
        { "name": "Alice", "age": 25, "city": "New York" },
        { "name": "Charlie", "age": 25, "city": "New York" }
      ]
    }
  },
  "30": {
    "London": {
      "items": [
        { "name": "Bob", "age": 30, "city": "London" }
      ]
    }
  },
  "35": {
    "London": {
      "items": [
        { "name": "Dave", "age": 35, "city": "London" }
      ]
    }
  }
}