减少时未正确打印数组

Question

我有 1 个 JavaScript 数组。我想根据日期合并这个数组并获取每个价格并将其放入字段中。然而，我只得到的价格是 1。同一日期的其他价格未打印。谁能帮我为什么？谢谢这是代码：JavaScript：var data = [   {      "date":"2010-01-01",      "name":"a"   },   {      "date":"2010-02-01",      "name":"b"   },   {      "date":"2010-03-01",      "name":"c"   },   {      "date":"2010-01-01",      "name":"aa"   },   ]var result1 = data.reduce((p, c) =>   (p[c.date] = Object.assign({},{name: null}, p[c.date], c)) && p  , {});var final = Object.keys(result1).map(x=>result1[x])console.log(final)您可以在此处访问代码：https://jsfiddle.net/q0wn2vuo/我想要这样的输出：[{ 日期: "2010-01-01", 名称: 'a,aa', }, { 日期: "2010-02-01", 名称: 'b', }, { 日期: "2010-03-01 “，价格：'c'，}]

Answer 1

干得好。

var data = [

   {

  "date":"2010-01-01",

  "name":"a"

   },

   {

  "date":"2010-02-01",

  "name":"b"

   },

   {

  "date":"2010-03-01",

  "name":"c"

   },

   {

  "date":"2010-01-01",

  "name":"aa"

   },

   

]

const resultSet = {};

 for (let i = 0, _len = data.length; i < _len; i++ ) {

       if(resultSet[data[i].date]){

        resultSet[data[i].date] += ","+data[i].name

       }

       else{

        resultSet[data[i].date] = data[i].name

       }

       

    }

const resultArr = Object.entries(resultSet).map(([key,value])=>{

 return { date: key, name: value }

})

console.log(resultArr)

Answer 2

尝试：

var data = [

   {

      "date":"2010-01-01",

      "name":"a"

   },

   {

      "date":"2010-02-01",

      "name":"b"

   },

   {

      "date":"2010-03-01",

      "name":"c"

   },

   {

      "date":"2010-01-01",

      "name":"aa"

   },  

]

var result1 = data.reduce((accum, curr) => {

  if (!accum[curr.date]) {

    return {...accum, [curr.date]: [curr.name] }

  }

  return {...accum, [curr.date]: [...accum[curr.date], curr.name] }

}, {})

var final = Object.keys(result1).map(date => ({

  date: date,

  name: result1[date].join(',')

}))

console.log(final)