javascript - 隔离 JSON 中具有相似属性的对象

Question

我有一个像这样的 JSON 对象:

[
   {"Subject": "Physics", "Active": 48, "Date": "2020-01-22T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 45, "Date": "2020-01-22T00:00:00Z"},
   {"Subject": "Mathematics", "Active": 40, "Date": "2020-01-22T00:00:00Z"},
   {"Subject": "English", "Active": 41, "Date": "2020-01-23T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 46, "Date": "2020-01-23T00:00:00Z"},
   {"Subject": "Mathematics", "Active": 42, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 40, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "Physics", "Active": 44, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "Hindi", "Active": 38, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "English", "Active": 41, "Date": "2020-01-25T00:00:00Z"},
   {"Subject": "Hindi", "Active": 42, "Date": "2020-01-25T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 33, "Date": "2020-01-26T00:00:00Z"},
   {"Subject": "Mathematics", "Active": 35, "Date": "2020-01-26T00:00:00Z"}
]

我需要通过根据日期添加事件来隔离这些数据。然后我需要将它插入另一个对象数组中。像这样的事情:

[{
    "Active": 133,
    "Date": "2020-01-22T00:00:00Z"
},
{
    "Active": 87,
    "Date": "2020-01-23T00:00:00Z"
},
{
    "Active": 164,
    "Date": "2020-01-24T00:00:00Z"
},
{
    "Active": 83,
    "Date": "2020-01-25T00:00:00Z"
},
{
    "Active": 68,
    "Date": "2020-01-26T00:00:00Z"
}]

Answer 1

这是我的建议

datas = [
   {"Subject": "Physics", "Active": 48, "Date": "2020-01-22T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 45, "Date": "2020-01-22T00:00:00Z"},
   {"Subject": "Mathematics", "Active": 40, "Date": "2020-01-22T00:00:00Z"},
   {"Subject": "English", "Active": 41, "Date": "2020-01-23T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 46, "Date": "2020-01-23T00:00:00Z"},
   {"Subject": "Mathematics", "Active": 42, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 40, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "Physics", "Active": 44, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "Hindi", "Active": 38, "Date": "2020-01-24T00:00:00Z"},
   {"Subject": "English", "Active": 41, "Date": "2020-01-25T00:00:00Z"},
   {"Subject": "Hindi", "Active": 42, "Date": "2020-01-25T00:00:00Z"},
   {"Subject": "Chemistry", "Active": 33, "Date": "2020-01-26T00:00:00Z"},
   {"Subject": "Mathematics", "Active": 35, "Date": "2020-01-26T00:00:00Z"}
];

function segregate(datas) {
    return datas.reduce((c, data) => {
        if (!c[data.Date]) {
            c[data.Date] = {
                Active: data.Active,
                Date: data.Date,
            };
        } else {
            c[data.Date].Active += data.Active;
        }
        return c;
    }, {});

}

console.log(segregate(datas));

希望这会有所帮助