如何按公共属性对对象数组进行分组并将其他属性放在一起

Question

我有一组这样的对象

const statuses = [
  {time: '21/1/1990', 'Status.sold': 8848},
  {time: '21/1/1990', 'Status.reserved': 8804},
  {time: '21/1/1991', 'Status.reserved': 8756},
  {time: '21/1/1991', 'Status.sold': 8732},
  {time: '21/1/1992', 'Status.killed': 8691},
  {time: '21/1/1992', 'Status.sold': 8620},
  {time: '21/1/1993', 'Status.held': 8511},
  {time: '21/1/1993', 'Status.killed': 8511},
  {time: '21/1/1994', 'Status.sold': 8498},
];

我想要实现的是将所有 Status. 属性放在一起并按 time 属性分组，这对所有对象都是通用的。所以最后的结果会是这样

const statuses = [
  {time: '21/1/1990', sold: 8848, killed: 0, reserved: 8804, held: 0},
  {time: '21/1/1991', sold: 8732, killed: 0, reserved: 8756, held: 0},
  {time: '21/1/1992', sold: 8620, killed: 8691, reserved: 0, held: 0},
  {time: '21/1/1993', sold: 0, killed: 8511, reserved: 0, held: 8511},
  {time: '21/1/1994', sold: 8498, killed: 0, reserved: 0, held: 0},
];

我试过这样的东西

const result = statuses.map((obj) => {
   return { ...obj, 
      sold: obj['Status.sold'] ? obj['Status.sold'] : 0,
      reserved: obj['Status.reserved'] ? obj['Status.reserved'] : 0,
      killed: obj['Status.killed'] ? obj['Status.killed'] : 0,
      held: obj['Status.held'] ? obj['Status.held'] : 0
   };
});

但我不确定如何按 time 对它们进行分组。如何将 reduce 方法与此代码结合使用？提前致谢！

Answer 1

您可以将对象按 time 进行分组。

const
    statuses = [{ time: '21/1/1990', 'Status.sold': 8848 }, { time: '21/1/1990', 'Status.reserved': 8804 }, { time: '21/1/1991', 'Status.reserved': 8756 }, { time: '21/1/1991', 'Status.sold': 8732 }, { time: '21/1/1992', 'Status.killed': 8691 }, { time: '21/1/1992', 'Status.sold': 8620 }, { time: '21/1/1993', 'Status.held': 8511 }, { time: '21/1/1993', 'Status.killed': 8511 }, { time: '21/1/1994', 'Status.sold': 8498 }],
    result = Object.values(statuses.reduce((r, { time, ...o }) => {
        r[time] ??= { time, sold: 0, killed: 0, reserved: 0, held: 0 };
        Object.entries(o).forEach(([k, v]) => r[time][k.slice(7)] += v);
        return r;
    }, {}));

console.log(result);

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Answer 2

试试这个：

const statuses = [
  {time: '21/1/1990', 'Status.sold': 8848},
  {time: '21/1/1990', 'Status.reserved': 8804},
  {time: '21/1/1991', 'Status.reserved': 8756},
  {time: '21/1/1991', 'Status.sold': 8732},
  {time: '21/1/1992', 'Status.killed': 8691},
  {time: '21/1/1992', 'Status.sold': 8620},
  {time: '21/1/1993', 'Status.held': 8511},
  {time: '21/1/1993', 'Status.killed': 8511},
  {time: '21/1/1994', 'Status.sold': 8498},
];

const result = [];

let obj = {};
for (let i = 0; i < statuses.length; i++) {
  const status = statuses[i];
  if (status.time != obj.time) {
    if (i != 0) result.push(obj); 
    obj = {
      time: status.time,
      sold: 0,
      reserved: 0,
      killed: 0,
      held: 0,
    }
  }
  if (status['Status.sold']) obj.sold += status['Status.sold'];
  if (status['Status.reserved']) obj.reserved += status['Status.reserved'];
  if (status['Status.killed']) obj.killed += status['Status.killed'];
  if (status['Status.held']) obj.held += status['Status.held'];
}
result.push(obj);
console.log(result);

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