javascript - 按属性分组对象

Question

我的问题有点类似于javascript | Object grouping .

我的输入对象是

[
  {
    "name":"Display",
    "group":"Technical detals",
    "id":"60",
    "value":"4"
  },
  {
    "name":"Manufacturer",
    "group":"Manufacturer",
    "id":"58",
    "value":"Apple"
  },
  {
    "name":"OS",
    "group":"Technical detals",
    "id":"37",
    "value":"Apple iOS"
  }
]

我需要的输出是

 [
  {
    "name":"Display",
    "group":"Technical detals",
    "id":"60",
    "value":"4"
  },
  {
    "name":"OS",
    "group":"Technical detals",
    "id":"37",
    "value":"Apple iOS"
  },
  {
    "name":"Manufacturer",
    "group":"Manufacturer",
    "id":"58",
    "value":"Apple"
  }

]

当我尝试实现答案时，我得到了

[[[object Object] {
  group: "Technical detals",
  id: "60",
  name: "Display",
  value: "4"
}, [object Object] {
  group: "Technical detals",
  id: "37",
  name: "OS",
  value: "Apple iOS"
}], [[object Object] {
  group: "Manufacturer",
  id: "58",
  name: "Manufacturer",
  value: "Apple"
}]]

我不想将具有相同属性的对象分组到一个数组中。我找不到他们将其插入数组的位置。帮我修一下:(

Answer 1

您可以对项目进行分组并将所有组连接到一个数组中。

It works by generating an object with the group as property an the items as items in the array.

In the next step, the object's values are taken and a new array is generated by concatination of the items with Array#reduce.

{                                                                              // hash
    "Technical detals": [
        {
            name: "Display",
            group: "Technical detals",
            id: "60",
            value: "4"
        },
        {
            name: "OS",
            group: "Technical detals",
            id: "37",
            value: "Apple iOS"
        }
    ],
    Manufacturer: [
        {
            name: "Manufacturer",
            group: "Manufacturer",
            id: "58",
            value: "Apple"
        }
    ]
}

var data = [{ name: "Display", group: "Technical detals", id: "60", value: "4" }, { name: "Manufacturer", group: "Manufacturer", id: "58", value: "Apple" }, { name: "OS", group: "Technical detals", id: "37", value: "Apple iOS" }],
    groups = Object.create(null),
    result = [];

data.forEach(function (a) {
    groups[a.group] = groups[a.group] || [];
    groups[a.group].push(a);    
});

result = Object.keys(groups).reduce(function (r, k) {
    return r.concat(groups[k]);
}, []);

console.log(result);

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或者只按组排序。

var data = [{ name: "Display", group: "Technical detals", id: "60", value: "4" }, { name: "Manufacturer", group: "Manufacturer", id: "58", value: "Apple" }, { name: "OS", group: "Technical detals", id: "37", value: "Apple iOS" }];

data.sort(function (a, b) {
    return a.group.localeCompare(b.group);
});

console.log(data);

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