如何使用 ES6 函数将每个对象中具有公共 id 的对象数组组合起来

Question

正在附加输入和输出格式。 `

//Input
[{"id":"146","catId":"25"},
{"id":"200","catId":"25"},
{"id":"250","catId":"55"}];

//Output expected
[{"catId":"25","topicIds":["146","200"]},
{"catId":"55","topicIds":["250"]}];

`

Answer 1

reduce可用于分组问题。在这里，我按 catId 分组，它将 return 一个分组对象

{
  25: {
    catId: "25",
    topicIds: ["146", "200"]
  },
  55: {
    catId: "55",
    topicIds: ["250"]
  }
}

然后使用 Object.values

获取值数组

let a = [{"id":"146","catId":"25"},
{"id":"200","catId":"25"},
{"id":"250","catId":"55"}];

let res = Object.values(a.reduce((acc,{id,catId}) => {
    acc[catId] = acc[catId] || {catId,topicIds:[]}
  acc[catId].topicIds.push(id)
  return acc
},{}))

console.log(res)

如何使用 ES6 函数将每个对象中具有公共 id 的对象数组组合起来

How to combine array of objects with common id in each object with ES6 functions

javascript

arrays

object

ecmascript-6