如何按值减少对象数组

如何解决如何按值减少对象数组

我有一个这样的对象数组：

const array = [
   { someDate: "2021-01-19T14:18:20.000",count: 13},{ someDate: "2021-01-28T12:57:15.000",count: 12},count: 10},{ someDate: "2021-01-19T14:18:20.000",count: 9},{ someDate: "2021-02-07T10:32:37.000",count: 7},count: 5},count: 4}
];

如果日期相同，我想按日期减少对象并获得该日期的计数总和。这就是我想要达到的结果

const array = [
   { someDate: "2021-01-19T14:18:20.000",count: 26},count: 22},];

我怎样才能做到这一点？任何示例将不胜感激！

解决方法

这个想法是跟踪您通过 someDate 看到的那些，然后将该记录的计数相加。

const array = [
   { someDate: "2021-01-19T14:18:20.000",count: 13},{ someDate: "2021-01-28T12:57:15.000",count: 12},count: 10},{ someDate: "2021-01-19T14:18:20.000",count: 9},{ someDate: "2021-02-07T10:32:37.000",count: 7},count: 5},count: 4}
];

const result = array.reduce((acc,current) => {
   const {someDate,count} = current;
   
   const existing = acc.find(a => a.someDate === someDate);
   if (existing) {
      existing.count += count;
   } else {
      acc.push(current);
   }
   
   return acc;
},[]);