Javascript将对象数组分组为两个值的组合

预期结果

var data=[
{custType:1,code:'savings',efDate:'2/3/19',exDate'2/3/19'},
{custType:1,code:'savings',efDate:'2/3/19',exDate:'2/3/19'},
{custType:1,code:'savings',efDate:'2/3/19',exDate:'2/3/19'},
{custType:1,code:'current',efDate:'2/3/19',exDate:'2/3/19'},
{custType:2,code:'current',efDate:'2/3/19',exDate:'2/3/19'},
{custType:2,code:'savings',efDate:'2/3/19',exDate:'2/3/19'},
{custType:2,code:'savings',efDate:'2/3/19',exDate:'2/3/19'}
];

---

当我试图找到一个具有（custType和code）的组时，我无法生成预期的结果。我应该在这里使用哪种方法？我可以使用reduce或groupBy吗。我对此感到困惑。

您可以构建一个嵌套哈希表：

var modifiedData=[
    [
    savings=[ {custType:1,code:'savings',efDate:'2/3/19',exDate:'2/3/19'},
              {custType:1,code:'savings',efDate:'2/3/19',exDate:'2/3/19'},
              {custType:1,code:'savings',efDate:'2/3/19',exDate:'2/3/19'}
 ],
    current=[ {custType:1,code:'current',efDate:'2/3/19',exDate:'2/3/19'} ]
    ],
  [
    savings=[ {custType:2,code:'savings',efDate:'2/3/19',exDate:'2/3/19'},
              {custType:2,code:'savings',efDate:'2/3/19',exDate:'2/3/19'} ],
    current=[ {custType:2,code:'current',efDate:'2/3/19',exDate:'2/3/19'} ]
    ]

];

---

您的预期结果无效。您想要一个数组数组，还是想要一个带有

储蓄

，

当前

键的对象数组请添加一个有效的结果（数组没有以文字表示法命名的属性）和代码，您已尝试过。

 const hash = {};

 for(const value of data) {
  const group = hash[value.custType] || (hash[value.custType] = {});
  const group2 = group[value.code] || (group[value.code] = []);
  group2.push(value);
}

const result = Object.values(hash).map(Object.values);