根据属性匹配将对象插入数组中特定位置

Question

我已经这样做了几天了，遗憾的是，我就是找不到正确的搜索词，也找不到我技能不足的正确答案。

我正在将ListServ转换为话语。我正在将RSS提要转换为JSON。源数据示例：

  {
    "title": "tech: 18F presentation",
    "id": 2,
    "body": "Sadly, my biggest concern is whether it will run on Linux or Windows. And I guess if they’ll thrown even more java at it.",
    "date": "Fri, 28 May 2021 20:50:04 +0000",
    "author": "john_doe"
  },
  {
    "title": "Re: tech: 18F presentation",
    "id": 3,
    "body": "throw more java, indeed. What a moon shot.",
    "date": "Fri, 28 May 2021 20:50:04 +0000",
    "author": "john_doe2"
  },
  {
    "title": "Re: tech: 18F presentation",
    "id": 4,
    "body": "Please stop saying moonshot, its not dodgecoin",
    "date": "Fri, 28 May 2021 20:50:04 +0000",
    "author": "jane_doe"
  },

我的数据结构需要如下所示：

{
   "topics": [
      {
        "id": 1,
        "title": "tech: 18F presentation",
        "pinned": false,
        "posts": [
    {
     "title": "Re: tech: 18F presentation",
     "id": 3,
     "body": "throw more java, indeed. What a moon shot.",
     "date": "Fri, 28 May 2021 20:50:04 +0000",
     "author": "john_doe2"
     },
    {
     "title": "Re: tech: 18F presentation",
     "id": 4,
     "body": "Please stop saying moonshot, its not dodgecoin",
     "date": "Fri, 28 May 2021 20:50:04 +0000",
     "author": "john_doe2"
     },
        ]
      }
    ]
  }

我需要每个带有"Re：“的标题插入到原始标题中。示例)任何回复，"Re tech: 18F presentation“都需要插入到标题为"tech: 18F presentation”的post：[]中(no Re：)。

我尝试将回复放入它自己的json中，并将其推送到post数组中，但我不能确定如何匹配适当的标题。

    let data = [];
  const original_post = [];
  const reply_to_post = [];
  const discourse_JSON = [];
    $("item").map(function (i, article) {
        const title = $(article).find("title")[0].children[0].data;
    const description = $(article).find("description")[0].children[0].data;
    const user_email = $(article).find("author")[0].children[0].data.match("<([^>]+)>")[1];
    const link = $(article).find("link")[0].children[0].data;
    const guid = $(article).find("guid")[0].children[0].data;
    const date = $(article).find("pubDate")[0].children[0].data;
    const name = user_email.substring(0,user_email.indexOf('@')).split("_")[0] + ' ' + user_email.substring(0,user_email.indexOf('@')).split("_")[1];
    const username = user_email.substring(0,user_email.indexOf('@'))
        if (
            !title.toLowerCase().includes("vacancy") &&
            !title.toLowerCase().includes("opportunity") &&
            !title.toLowerCase().includes("retirement") &&
      !title.toLowerCase().includes("position") &&
      !title.toLowerCase().includes("job posting") && 
      !description.toLowerCase().includes("vacancy announcement")  &&
      !description.toLowerCase().includes("vacancy posting") &&
      !description.toLowerCase().includes("vacancies")

        ) {
 

   data.push({
    "title": title,
    "id": i,
    "body": description,
    "date": date,
    "author": username







    }
});

Answer 1

这实际上只是一个“groupBy”，使用一些字符串操作来确定层次结构。

下面是一个使用Array#reduce()并检查标题startsWith() 'Re:‘的示例。如果是这样，请使用String#replace()和trim()删除开头的'Re:‘，并保留任何空格以保持一致性。

​

const
  input = [{ "title": "Re: Re: Re: tech: 18F presentation", "id": 3, "body": "throw more java, indeed. What a moon shot.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe2" }, { "title": "tech: 18F presentation", "id": 2, "body": "Sadly, my biggest concern is whether it will run on Linux or Windows. And I guess if they’ll thrown even more java at it.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe" }, { "title": "Re: tech: 18F presentation", "id": 4, "body": "Please stop saying moonshot, its not dodgecoin", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "jane_doe" }, { "title": "Re: other: Title", "id": 6, "body": "throw more java, indeed. What a moon shot.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe2" }, { "title": "other: Title", "id": 5, "body": "Sadly, my biggest concern is whether it will run on Linux or Windows. And I guess if they’ll thrown even more java at it.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe" },],

  byTopic = input.reduce((acc, { title, ...post }) => {
    if (title.startsWith('Re:')) {
      const topic = title.replace(/^(?:Re: ){1,}/, '').trim();
      acc[topic] || (acc[topic] = { posts: [] });
      acc[topic].posts.push({ title: topic, ...post });
      // using nullish coalescing assignment
      // (acc[topic] ??= { posts: [] }).posts.push({ title: topic, ...post });
    } else {
      acc[title] = {
        id: post.id, // your example changes id in the expected output, unsure of the logic
        title: title,
        pinned: false, // not sure where pinned is coming from
        posts: acc[title] ? acc[title].posts : []
        // using optional chaining and nullish coalescing
        // posts: acc[title]?.posts ?? []
      }
    }
    return acc;
  }, {})

console.log(Object.values(byTopic));

.as-console-wrapper { max-height: 100% !important; top: 0; }

​

正如我在评论中提到的，以这种方式使用reduce()可以直接替换为外部累加器和for循环。这里使用的是for...of

​

const input = [{ "title": "Re: Re: Re: tech: 18F presentation", "id": 3, "body": "throw more java, indeed. What a moon shot.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe2" }, { "title": "tech: 18F presentation", "id": 2, "body": "Sadly, my biggest concern is whether it will run on Linux or Windows. And I guess if they’ll thrown even more java at it.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe" }, { "title": "Re: tech: 18F presentation", "id": 4, "body": "Please stop saying moonshot, its not dodgecoin", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "jane_doe" }, { "title": "Re: other: Title", "id": 6, "body": "throw more java, indeed. What a moon shot.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe2" }, { "title": "other: Title", "id": 5, "body": "Sadly, my biggest concern is whether it will run on Linux or Windows. And I guess if they’ll thrown even more java at it.", "date": "Fri, 28 May 2021 20:50:04 +0000", "author": "john_doe" },];

const byTopic = {};

for (const { title, ...post } of input) {
  if (title.startsWith('Re:')) {
    const topic = title.replace(/^(?:Re: ){1,}/, '').trim();
    byTopic[topic] || (byTopic[topic] = { title: topic, posts: [] });
    byTopic[topic].posts.push({ title: topic, ...post });
  } else {
    byTopic[title] = {
      id: post.id,
      title: title,
      pinned: false,
      posts: [],
      ...byTopic[title]
    }
  }
};

console.log(Object.values(byTopic));

.as-console-wrapper { max-height: 100% !important; top: 0; }

​

Answer 2

下面是一个使用Array.forEach运算符的简单解决方案。可能有更有效的解决方案，如果您有一个大型数据集，这可能很重要：

const source = [{title:"tech: 18F presentation",id:2,body:"Sadly, my biggest concern is whether it will run on Linux or Windows. And I guess if they’ll thrown even more java at it.",date:"Fri, 28 May 2021 20:50:04 +0000",author:"john_doe"},{title:"Re: tech: 18F presentation",id:3,body:"throw more java, indeed. What a moon shot.",date:"Fri, 28 May 2021 20:50:04 +0000",author:"john_doe2"},{title:"Re: tech: 18F presentation",id:4,body:"Please stop saying moonshot, its not dodgecoin",date:"Fri, 28 May 2021 20:50:04 +0000",author:"jane_doe"}];

let = formatted = [];
// Loop over the original data, find parents
source.forEach((item) => {
  // Is not a reply
  if (item.title.indexOf('Re:') === -1) {
    formatted.push(item);
  }
});
// Find children, append to parents
source.forEach((item) => {
  formatted.forEach((parent) => {
    // Child contains parent title.
    if (item.title.indexOf(parent.title) !== -1 && item.title.indexOf('Re:') !== -1) {
      if (!parent.data) {
        parent.data = [];
      }
      parent.data.push(item);
    }
  })
});
console.log(formatted);