group by和sum，并为每个数组javascript生成一个对象 [英] group by, and sum, and generate a object for each array javascript

问题描述

我需要帮助，我需要按ID和总和分组，但我需要为每个结果添加一个新对象

i need help with this, i need group by id and sum, but i need a new object for each result

let data =[
    {"id":"2018", "name":"test", "total":1200},
    {"id":"2019", "name":"wath", "total":1500},
    {"id":"2019", "name":"wath", "total":1800},
    {"id":"2020", "name":"zooi", "total":1000},
]

我有这个代码只返回一个结果的对象

i have this code that return just one object with the result

let result = data.reduce(function (r, o) {
    (r[o.id])?
        r[o.id] += o.total:
        r[o.id] = o.total; 
    return r;
});

但我需要这样的一些

[
    {"id":"2018", "name":"test", "total":1200},
    {"id":"2019", "name":"wath", "total":2300},
    {"id":"2020", "name":"zooi", "total":1000},
]

任何建议？，谢谢

推荐答案

你可以试试这个：

const result = Object.values(data.reduce((r, o) => (r[o.id]
  ? (r[o.id].total += o.total)
  : (r[o.id] = {...o}), r), {}));

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