javascript - 如何在javascript中将两个不同的对象数组组合成一个新的对象数组？

Question

我有两个具有相同 news_ids 但属性不同的对象数组，我只是想知道如何组合它们并获取新的对象数组？

例如:

let arr1 = [{
    news_id: 1,
    title: "title1"
  },
  {
    news_id: 2,
    title: "title2"
  },
  {
    news_id: 3,
    title: "title3"
  },
  {
    news_id: 4,
    title: "title4"
  },
]

let arr2 = [{
    news_id: 3,
    count: 3
  },
  {
    news_id: 4,
    count: 4
  }
]

我想得到:

[
  {news_id: 1, title: "title1", count: 0},
  {news_id: 2, title: "title2", count: 0},
  {news_id: 3, title: "title3", count: 3},
  {news_id: 4, title: "title4", count: 4}
]

Answer 1

您可以使用 forEach 和 filter 来做到这一点，如下所示:

arr1.forEach(i => i.count = (arr2.find(j => j.news_id == i.news_id) || { count: 0 }).count)

试试下面的方法。

let arr1 = [{
    news_id: 1,
    title: "title1"
  },
  {
    news_id: 2,
    title: "title2"
  },
  {
    news_id: 3,
    title: "title3"
  },
  {
    news_id: 4,
    title: "title4"
  },
]

let arr2 = [{
    news_id: 3,
    count: 3
  },
  {
    news_id: 4,
    count: 4
  }
]

arr1.forEach(i => i.count = (arr2.find(j => j.news_id == i.news_id) || { count: 0 }).count);
console.log(arr1);