分组到json数组中

const data = [
  { name: 'Alice', group: 'A' },
  { name: 'Bob', group: 'B' },
  { name: 'Charlie', group: 'A' },
  { name: 'David', group: 'C' },
  { name: 'Eve', group: 'B' }
];

const groupedData = data.reduce((result, item) => {
  if (!result[item.group]) {
    result[item.group] = [];
  }
  result[item.group].push(item);
  return result;
}, {});

const jsonGroupedData = JSON.stringify(groupedData);

console.log(jsonGroupedData);

{
  "A": [
    { "name": "Alice", "group": "A" },
    { "name": "Charlie", "group": "A" }
  ],
  "B": [
    { "name": "Bob", "group": "B" },
    { "name": "Eve", "group": "B" }
  ],
  "C": [
    { "name": "David", "group": "C" }
  ]
}