如何使用 reduce() 在数组中创建键对象和值

Question

我有一个对象数组，我需要 return 一个对象，它的键是宠物的类型，它的值是一个包含宠物名称的数组。但我无法创建名称数组。

let pets=[
    {name:'kity', edad:10,type:'cat'},
    {name:'saske', edad:10,type:'dog'},
    {name:'naruto', edad:10,type:'dog'},
    {name:'goku', edad:10,type:'cat'},
    {name:'flofy', edad:10,type:'dog'},
    {name:'flufin', edad:10,type:'cat'},
    {name:'honey', edad:10,type:'bird'},
    {name:'silvestre', edad:10,type:'cat'},
    {name:'taz', edad:10,type:'dog'},
    {name:'piolin', edad:10,type:'bird'},
    {name:'gogeta', edad:10,type:'dog'},
]

const reduced = pets.reduce((acc, {name,type}) => ({
        ...acc, [`Type${type}`]: acc[...name]
        }), {});

预计

reduce ={
            Typecat:['kity','goku','flufin','silvestre'],
            Typedog:['saske','naruto','flofy','taz','gogeta'],
            Typebird:['honey','piolin']
        }

Answer 1

你可以这样做：

let pets=[
  {name:'kity', edad:10,type:'cat'},
  {name:'saske', edad:10,type:'dog'},
  {name:'naruto', edad:10,type:'dog'},
  {name:'goku', edad:10,type:'cat'},
  {name:'flofy', edad:10,type:''},
  {name:'flufin', edad:10,type:'cat'},
  {name:'honey', edad:10,type:'bird'},
  {name:'silvestre', edad:10,type:'cat'},
  {name:'taz', edad:10,type:'dog'},
  {name:'piolin', edad:10,type:'bird'},
  {name:'gogeta', edad:10,type:'dog'},
];

const result = pets.reduce((acc, item) => {
  if(acc[`Type${item.type}`]) {
    acc[`Type${item.type}`].push(item.name);
  } else {
    acc[`Type${item.type}`] = [item.name];
  }
  return acc;
}, {});

console.log(result);

Answer 2

您可以做的是：

const result = pets.reduce((acc, item) => {
  const values = acc[item.type] ? acc[item.type].concat(item.name) : [item.name]
  
  return {
    ...acc,
    [item.type]: values
  }
}, {});

如何使用 reduce() 在数组中创建键对象和值

how to create a key object and value in an array using reduce()

javascript

reduce