javascript - 如何将对象数组转换为自定义分组数组

Question

我正在尝试将数据对象转换为自定义格式

这是我要转换的数据

[
  { Name: 15, GroupID: 1, Id: 1 },
  { Name: 16, GroupID: 1, Id: 1 },
  { Name: 17, GroupID: 2, Id: 2 },
  { Name: 18, GroupID: 2, Id: 2 },
  { Name: 15, GroupID: 3, Id: 3 },
  { Name: 16, GroupID: 3, Id: 3 },
  { Name: 17, GroupID: 4, Id: 4 },
  { Name: 18, GroupID: 4, Id: 4 }
];

这就是我想要的

  { GroupID: 1 },

  { Name: 15, Id: 1 },
  { Name: 16, Id: 1 },

  { GroupID: 2 },

  { Name: 17, Id: 2 },
  { Name: 18, Id: 2 },

  { GroupID: 3 },

  { Name: 15, Id: 3 },
  { Name: 16, Id: 3 },

  { GroupID: 4 },

  { Name: 17, Id: 4 },
  { Name: 18, Id: 4 }

这是我目前尝试的方法

var data = [
  { Name: 15, GroupID: 1, Id: 1 },
  { Name: 16, GroupID: 1, Id: 1 },
  { Name: 17, GroupID: 2, Id: 2 },
  { Name: 18, GroupID: 2, Id: 2 },
  { Name: 15, GroupID: 3, Id: 3 },
  { Name: 16, GroupID: 3, Id: 3 },
  { Name: 17, GroupID: 4, Id: 4 },
  { Name: 18, GroupID: 4, Id: 4 }
];

var previousGroupId;
var newObject = new Object();
for (index in data) {
  var groupId = data[index].GroupID;
  if (groupId != previousGroupId) {
    var newGroup = "GroupId" + groupId;
    newObject[newGroup] = new Array();
    for (index in data) {
      if (data[index].GroupID == groupId) {
        var customObject = {
          "GroupID": groupId,
          "Name": data[index].Name,
          "Id": data[index].Id
        };
        newObject[newGroup].push(customObject);
      }
    }
  }
  previousGroupId = groupId;
}

console.log(newObject);

即使我试图提及这个 Javascript group objects by property

任何建议都会有所帮助。

Answer 1

假设一个对象数组作为结果集，您可以采用带有数组的哈希表并将平面数组作为结果集。

var data = [{ Name: 15, GroupID: 1, Id: 1 }, { Name: 16, GroupID: 1, Id: 1 }, { Name: 17, GroupID: 2, Id: 2 }, { Name: 18, GroupID: 2, Id: 2 }, { Name: 15, GroupID: 3, Id: 3 }, { Name: 16, GroupID: 3, Id: 3 }, { Name: 17, GroupID: 4, Id: 4 }, { Name: 18, GroupID: 4, Id: 4 }],
    result = Object
        .values(data.reduce((r, { Name, GroupID, Id }) => {
            r[GroupID] = r[GroupID] || [{ GroupID }];
            r[GroupID].push({ Name, Id });
            return r;
        }, {}))
        .flat();

console.log(result);

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