使用Lodash在对象数组中使用多个groupBy和sumBy

const _ = require('lodash');

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 = _.groupBy(data, 'gender');
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' }
  ]
}

const _ = require('lodash');

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 totalAge = _.sumBy(data, 'age');
console.log(totalAge);

175

const _ = require('lodash');

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 = _.groupBy(data, 'gender');
const result = {};

_.forEach(groupedData, (group, key) => {
  result[key] = _.sumBy(group, 'age');
});

console.log(result);

{
  female: 70,
  male: 105
}