json 按键分组对象并返回新对象[重复]

ycl3bljg 于 2023-03-31 发布在其他

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此问题在此处已有答案：

（19个答案）
How to group an array of objects based on multiple keys in Javascript?（3个答案）
2天前关闭。
我有一个对象数组，我需要在JavaScript中以适合我的方式对其进行排序。
这是一个数组的例子：

[
  {
    "id": "AD012014001R",
    "country": "AD",
    "series": 1,
    "issue_year": 2014
  },
  {
    "id": "AD012014002R",
    "country": "AD",
    "series": 1,
    "issue_year": 2014
  },
  {
    "id": "AT012002002R",
    "country": "AT",
    "series": 1,
    "issue_year": 2002
  },
  {
    "id": "BE011999100R",
    "country": "BE",
    "series": 1,
    "issue_year": 1999
  },
  {
    "id": "BE011999200R",
    "country": "BE",
    "series": 1,
    "issue_year": 1999
  },
  {
    "id": "BE022008001R",
    "country": "BE",
    "series": 2,
    "issue_year": 2008
  }
]

我的输出应该是这样的：

[
  {
    "country": "AD",
    "series": [
      {
        "series": 1,
        "coins": [
          {
            "id": "AD012014001R",
            "country": "AD",
            "series": 1,
            "issue_year": 2014
          },
          {
            "id": "AD012014002R",
            "country": "AD",
            "series": 1,
            "issue_year": 2014
          }
        ]
      }
    ]
  },
  {
    "country": "AT",
    "series": [
      {
        "series": 1,
        "coins": [
          {
            "id": "AT012002002R",
            "country": "AT",
            "series": 1,
            "issue_year": 2002
          }
        ]
      }
    ]
  },
  {
    "country": "BE",
    "series": [
      {
        "series": 1,
        "coins": [
          {
            "id": "BE011999100R",
            "country": "BE",
            "series": 1,
            "issue_year": 1999
          },
          {
            "id": "BE011999200R",
            "country": "BE",
            "series": 1,
            "issue_year": 1999
          }
        ]
      },
      {
        "series": 2,
        "coins": [
          {
            "id": "BE022008001R",
            "country": "BE",
            "series": 2,
            "issue_year": 2008
          }
        ]
      }
    ]
  }
]

所以我的API响应必须更大，但这只是其中的一小部分。我得到了数百个看起来像这样的对象的数组，需要对它们进行排序，并首先按国家排序，然后按每个国家下的系列返回它们。我知道有很多类似的问题，但我无法弄清楚，因为我的问题比所有问题都复杂。

JSON

来源：https://stackoverflow.com/questions/75870926/grouping-objects-by-key-and-returning-new-object

1条答案

按热度按时间

zf9nrax11#

你可以使用一个包含组键和children属性的数组来实现多步操作。然后在级别上找到组并构建一个新的对象，或者只是返回子对象。最后推送对象。

const
    data = [{ id: "AD012014001R", country: "AD", series: 1, issue_year: 2014 }, { id: "AD012014002R", country: "AD", series: 1, issue_year: 2014 }, { id: "AT012002002R", country: "AT", series: 1, issue_year: 2002 }, { id: "BE011999100R", country: "BE", series: 1, issue_year: 1999 }, { id: "BE011999200R", country: "BE", series: 1, issue_year: 1999 }, { id: "BE022008001R", country: "BE", series: 2, issue_year: 2008 }],
    groups = [
        ['country', 'series'],
        ['series', 'coins']
    ],
    result = data.reduce((r, o) => {
        groups
            .reduce((level, [key, children]) => {
                let group = level.find(q => q[key] === o[key]);
                if (!group) level.push(group = { [key]: o[key], [children]: [] });
                return group[children];
            }, r)
            .push(o);
        return r;
    }, []);

console.log(result);

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json 按键分组对象并返回新对象[重复]

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