按key分组对象数组- javascript

const arr = [
  { name: 'apple', category: 'fruit' },
  { name: 'banana', category: 'fruit' },
  { name: 'carrot', category: 'vegetable' },
  { name: 'potato', category: 'vegetable' }
];

const grouped = arr.reduce((result, current) => {
  const key = current.category;
  if (!result[key]) {
    result[key] = [];
  }
  result[key].push(current);
  return result;
}, {});

console.log(grouped);

{
  fruit: [
    { name: 'apple', category: 'fruit' },
    { name: 'banana', category: 'fruit' }
  ],
  vegetable: [
    { name: 'carrot', category: 'vegetable' },
    { name: 'potato', category: 'vegetable' }
  ]
}