Javascript reduce根据条件对对象进行分组

const data = [
  { name: 'Alice', age: 25, gender: 'female' },
  { name: 'Bob', age: 30, gender: 'male' },
  { name: 'Charlie', age: 35, gender: 'male' },
  { name: 'David', age: 40, gender: 'male' },
  { name: 'Eve', age: 45, gender: 'female' }
];

const groupedData = data.reduce((groups, item) => {
  if (item.gender === 'female') {
    if (!groups.female) {
      groups.female = [];
    }
    groups.female.push(item);
  } else {
    if (!groups.male) {
      groups.male = [];
    }
    groups.male.push(item);
  }
  return groups;
}, {});

console.log(groupedData);

{
  female: [
    { name: 'Alice', age: 25, gender: 'female' },
    { name: 'Eve', age: 45, gender: 'female' }
  ],
  male: [
    { name: 'Bob', age: 30, gender: 'male' },
    { name: 'Charlie', age: 35, gender: 'male' },
    { name: 'David', age: 40, gender: 'male' }
  ]
}