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

我有一个这样的对象数组

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},
];

而我想要实现的是把所有的Status. 属性一起并按time属性分组，这对所有对象都是通用的。 所以最终的结果会是这样的

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},
];

我尝试过这样的事情

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

您可以使用 object 按time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

尝试这个：

 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);