javascript - 使用数组中的键返回一个新对象

Question

我正在尝试从下面的 people 数组创建一个新对象，使用 born 作为键，其中包含该年出生的所有人员:

 const newObject = {
      '1971': {
        male: [ [Object], [Object] ],
        female: [ [Object] ]
      },
      '1972': {
        male: [ [Object], [Object] ],
        female: [ [Object] ]
      }
    }

这是迄今为止我的代码:

people.map(person => {
  let {
    born,
    sex
  } = person;

  newPeople[born] = sex == "male" ? {
    male: Array.isArray(male) && array.length ? male.push(person) : [],
    female: Array.isArray(female) && female.length ? female.push(person) : []}
})

人群:

const people = [{
    name: 'Jim',
    sex: 'male',
    born: '1971',
    address: {
      town: 'London',
    },
  },
  {
    name: 'Bob',
    sex: 'male',
    born: '1971',
    address: {
      town: 'London',
    },
  },....

jsfiddle 设置在这里:https://jsfiddle.net/jw9n3bmr/

Answer 1

这是一个使用 reduce 解决您想要执行的操作的解决方案:

const people = [{
    name: 'Jim',
    sex: 'male',
    born: '1971',
    address: {
      town: 'London',
    },
  },
  {
    name: 'Bob',
    sex: 'male',
    born: '1971',
    address: {
      town: 'London',
    },
  }
];
  
const result = people.reduce((acc, currVal) => {
  (acc[currVal.born] || (acc[currVal.born] = { male: [], female: [] }))[currVal.sex].push(currVal);
  return acc;
}, {});
  
console.log(result);