如何从第一级和第二级数组获取IDS列表-Javascript

debugcn 发表于 Dev

永席尔瓦

我在json / javascript中具有以下结构

{
  "comments": [
    {
      "id": 1,
      "content": "lorem ipsum",
      "answers": []
    },
    {
      "id": 2,
      "content": "lorem ipsum",
      "answers": [
        {
          "id": 30,
          "content": "lorem ipsum"
        }
      ]
    },
    {
      "id": 3,
      "content": "lorem ipsum",
      "answers": [
        {
          "id": 99,
          "content": "lorem ipsum"
        },
        {
          "id": 103,
          "content": "lorem ipsum"
        }
      ]
    },
    {
      "id": 5,
      "content": "comment",
      "answers": []
    }
  ]
}

我需要创建一个包含所有评论的ID的数组，包括答案类型的评论

最终应该看起来像这样

[1, 2, 3, 5, 30, 99, 103]

注：我可以只使用map，reduce并filter

谁能帮我这个？

提前致谢

布莱克斯

如果还可以使用flat：

const data = {comments:[{id:1,content:"lorem ipsum",answers:[]},{id:2,content:"lorem ipsum",answers:[{id:30,content:"lorem ipsum"}]},{id:3,content:"lorem ipsum",answers:[{id:99,content:"lorem ipsum"},{id:103,content:"lorem ipsum"}]},{id:5,content:"comment",answers:[]}]};

function findIds(obj) {
  return obj.comments.map(com => {
    return [ com.id, ...com.answers.map(ans => ans.id) ]
  })
  .flat()
  .sort((a, b) => a - b);
}

console.log( findIds(data) ); // [1,2,3,5,30,99,103]

否则，只需使用map和reduce：

const data = {comments:[{id:1,content:"lorem ipsum",answers:[]},{id:2,content:"lorem ipsum",answers:[{id:30,content:"lorem ipsum"}]},{id:3,content:"lorem ipsum",answers:[{id:99,content:"lorem ipsum"},{id:103,content:"lorem ipsum"}]},{id:5,content:"comment",answers:[]}]};

function findIds(obj) {
  return obj.comments.reduce((res, com) => {
    return [ ...res, com.id, ...com.answers.map(ans => ans.id) ]
  }, [])
  .sort((a, b) => a - b);
}

console.log( findIds(data) ); // [1,2,3,5,30,99,103]

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