使用键拆分对象数组

function splitArrayByKey(array, key) {
  const result = {};
  array.forEach(obj => {
    const value = obj[key];
    if (!result[value]) {
      result[value] = [];
    }
    result[value].push(obj);
  });
  return result;
}

// 示例用法
const data = [
  { id: 1, name: 'Alice', group: 'A' },
  { id: 2, name: 'Bob', group: 'B' },
  { id: 3, name: 'Charlie', group: 'A' },
  { id: 4, name: 'David', group: 'C' },
];

const result = splitArrayByKey(data, 'group');
console.log(result);

{
  A: [
    { id: 1, name: 'Alice', group: 'A' },
    { id: 3, name: 'Charlie', group: 'A' }
  ],
  B: [
    { id: 2, name: 'Bob', group: 'B' }
  ],
  C: [
    { id: 4, name: 'David', group: 'C' }
  ]
}