Question

当对象的三个属性相同时，如何将对象合并到对象数组中？

var data = [
 {
"Location": "London",
"OrderNo": "406643",
"Qty": "22.07",
"OrderDate": "28/11/2018",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "526209",
"Qty": "21.00",
"OrderDate": "01/03/2019",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "526209",
"Qty": "65.00",
"OrderDate": "01/03/2019",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "526209",
"Qty": "61.00",
"OrderDate": "01/03/2019",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "406643",
"Qty": "14.07",
"OrderDate": "28/11/2018",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "406643",
"Qty": "12.07",
"OrderDate": "26/11/2018",
"Status": null
 },
];

仅当对象的Location，OrderNo和OrderDate属性相同时，我才希望合并对象。我还希望在其他三个属性匹配时添加qty属性。

这是我想要的输出

var output = [
 {
"Location": "London",
"OrderNo": "406643",
"Qty": "36.14",
"OrderDate": "28/11/2018",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "526209",
"Qty": "147.00",
"OrderDate": "01/03/2019",
"Status": null
 },
 {
"Location": "London",
"OrderNo": "406643",
"Qty": "12.07",
"OrderDate": "26/11/2018",
"Status": null
 },
];

请注意，在变量输出的第一个和第三个或最后一个对象中，两个属性相同，但orderDate不同。

Answer 1

您可以结合使用reduce和findIndex数组方法来获得所需的内容。

对于reduce方法中的每次迭代，请使用findIndex检查结果数组中是否已经存在符合您条件的对象。如果没有匹配项，则只需将当前对象推送到结果数组中。如果匹配，则对数量属性求和。

var data = [
  {
  "Location": "London",
  "OrderNo": "406643",
  "Qty": "22.07",
  "OrderDate": "28/11/2018",
  "Status": null
  },
  {
  "Location": "London",
  "OrderNo": "526209",
  "Qty": "21.00",
  "OrderDate": "01/03/2019",
  "Status": null
  },
  {
  "Location": "London",
  "OrderNo": "526209",
  "Qty": "65.00",
  "OrderDate": "01/03/2019",
  "Status": null
  },
  {
  "Location": "London",
  "OrderNo": "526209",
  "Qty": "61.00",
  "OrderDate": "01/03/2019",
  "Status": null
  },
  {
  "Location": "London",
  "OrderNo": "406643",
  "Qty": "14.07",
  "OrderDate": "28/11/2018",
  "Status": null
  },
  {
  "Location": "London",
  "OrderNo": "406643",
  "Qty": "12.07",
  "OrderDate": "26/11/2018",
  "Status": null
  }
];

data = data.reduce((acc, v) => {
  const index = acc.findIndex(o => {
    return  o.Location === v.Location && 
            o.OrderNo === v.OrderNo && 
            o.OrderDate === v.OrderDate
  });
  
  if (index >= 0) {
    acc[index].Qty = (Number(acc[index].Qty) + Number(v.Qty)).toFixed(2);
  } else {
    acc.push(v);
  }
  
  return acc;
}, []);

console.log(data);

当对象中的三个属性相等时，如何合并对象数组的对象？ -JavaScript

1 个答案: