将 JavaScript 对象重组为具有命名键的对象数组

Question

我有以下 JavaScript 对象：

const groupedData = {
  "1":[
    {"x":"2021-02-05","y":1},
    {"x":"2021-02-05","y":1},
    {"x":"2021-02-06","y":1}
  ],
  "2":[
    {"x":"2021-02-05","y":1},
    {"x":"2021-02-06","y":1},
    {"x":"2021-02-07","y":1},
    {"x":"2021-02-07","y":1},
    {"x":"2021-02-07","y":1},
    {"x":"2021-02-08","y":1}
  ]
}

我想按 x 对每个数组中的对象进行分组并按 y 求和，并将数据塑造成略有不同的结构，以便图表库可以使用它.我有以下函数可以成功进行分组和求和：

const formattedData = [];
Object.keys(groupedData).map((key) => {
  var totals = groupedData[key].reduce(function (r, o) {
    (r[o.x]) ? r[o.x] += o.y : r[o.x] = o.y;
    return r;
  }, {});
  formattedData.push({ 'name': key, 'data': totals })
});

这会输出以下内容：

[
  {
    "name":"1",
    "data": {
      "2021-02-05":2,
      "2021-02-06":1 
    }
  },
  {
    "name":"2",
    "data": {
      "2021-02-05":1,
      "2021-02-06":1,
      "2021-02-07":3,
      "2021-02-08":1
    }
  }
]

但是，我希望数据采用以下格式：

[
  {
    "name":"1",
    "data":[
      {"x":"2021-02-05","y":2},
      {"x":"2021-02-06","y":1}
    ]
  },
  {
    "name":"2",
    "data":[
      {"x":"2021-02-05","y":1},
      {"x":"2021-02-06","y":1},
      {"x":"2021-02-07","y":3},
      {"x":"2021-02-08","y":1}
    ]
  }
]

我正在努力想出一种巧妙的方法来完成格式化的最后一部分。谁能建议如何修改格式化功能以巧妙地实现这最后一步？

非常感谢

Answer 1

您可以映射对象的条目并对值进行分组。

const
    data = { 1: [{ x: "2021-02-05", y: 1 }, { x: "2021-02-05", y: 1 }, { x: "2021-02-06", y: 1 }], 2: [{ x: "2021-02-05", y: 1 }, { x: "2021-02-06", y: 1 }, { x: "2021-02-07", y: 1 }, { x: "2021-02-07", y: 1 }, { x: "2021-02-07", y: 1 }, { x: "2021-02-08", y: 1 }] },
    result = Object.entries(data).map(([name, data]) => ({
        name,
        data: Object.values(data.reduce((r, { x, y }) => {
            r[x] ??= { x, y: 0 };
            r[x].y += y;
            return r;
        }, {}))
    }));

console.log(result);

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将 JavaScript 对象重组为具有命名键的对象数组

Restructure JavaScript object into array of objects with named keys

javascript

reduce