按键分组对象并返回新对象

Question

我有一组对象，我需要以适合我的方式在 JavaScript 中对其进行排序。

这是我拥有的数组示例：

[
  {
    "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返回它们，首先按国家排序，然后按每个国家下的系列排序。我知道有很多类似的问题，但我想不通，因为我的问题比所有问题都复杂一点。

Answer 1

您可以通过拥有一组组键和子属性来采用多 ruping 方法。然后找到级别的组并构建一个新对象或只返回孩子。最后推对象。

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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