JavaScript groupby sum给出错误结果

问题描述

我有此词典列表，数据，我想应用分组依据，然后金额总和，但是我得到的截止日期为{{ 1}}，而不是最终聚合中的2020-05-11 00:00:00+00

请指出我做错了什么地方。

输入数据：-

2020-05-17 00:00:00+00

预期结果：-

data = [
{start_date: "2020-05-11 00:00:00+00",end_date: "2020-05-17 00:00:00+00",id: "ola",amount: 10},{start_date: "2020-05-11 00:00:00+00",amount: 2}
]

当前结果：-

start_date: "2020-05-11 00:00:00+00",amount: 12}

分组依据公式：-

start_date: "2020-05-11 00:00:00+00",end_date: "2020-05-11 00:00:00+00",amount: 12}

如果还有其他使用Javascript的解决方案，请提出建议。谢谢

解决方法

因为要链接data，所以下一个groupBy只需要采用一个参数（即doc中的变换键的迭代器）

您可以设置start_date和end_date组合的组密钥

const data = [
  {
    start_date: "2020-05-11 00:00:00+00",end_date: "2020-05-17 00:00:00+00",id: "ola",amount: 10,},{
    start_date: "2020-05-11 00:00:00+00",amount: 2,]

const result = _(data)
  .groupBy((obj) => [obj.start_date,obj.end_date].join("to"))
  .map((value,key) => ({
    start_date: key.split("to")[0],end_date: key.split("to")[1],amount: _.sumBy(value,"amount"),}))
  .value()

console.log(result)

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.20/lodash.min.js"></script>

,

使用开始和结束作为键的简单化简循环

data = [{
    start_date: "2020-05-11 00:00:00+00",amount: 10
  },amount: 2
  }
]


const groupIt = data => {
  const groupings = data.reduce((grps,item) => {
    const { start_date,end_date,amount } = item;
    const key = `${start_date}-${end_date}`;
    grps[key] = grps[key] || { start_date,amount: 0 };
    grps[key].amount += amount;
    return grps;
  },{});
  return Object.values(groupings);
}

const result = groupIt(data);
console.log(result);